start work on 2.0.19-SNAPSHOT

Signed-off-by: ceki <ceki@qos.ch>

.github/FUNDING.yml

@@ -0,0 +1,2 @@
+tidelift: maven/org.slf4j:slf4j-api
+github: qos-ch

.github/workflows/main.yml

@@ -26,18 +26,19 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        jdk: [11, 17]
+        jdk: [11, 17, 19]
         os: [ubuntu-latest, windows-latest, macos-latest]
       fail-fast: true
       max-parallel: 4
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
       with:
         fetch-depth: 50
     - name: Set up Java ${{ matrix.jdk }}
       if: ${{ matrix.jdk != '8' }}
-      uses: actions/setup-java@v1
+      uses: actions/setup-java@v3
       with:
+        distribution: 'temurin'      
         java-version: ${{ matrix.jdk }}
     - name: Install
       # download dependencies, etc, so test log looks better

README.md

@@ -2,15 +2,34 @@
 
 The Simple Logging Facade for Java (SLF4J) serves as a simple facade
 or abstraction for various logging frameworks (e.g. java.util.logging,
-logback, log4j) allowing the end user to plug in the desired logging
-framework at deployment time.
+logback, reload4j, log4j 2.x, logevents, penna, rainbowgum, tinylog)
+allowing the end user to plug in the desired logging framework at
+deployment time.
 
 More information can be found on the [SLF4J website](http://www.slf4j.org).
 
-# Build Status
-[![Build Status](https://travis-ci.org/qos-ch/slf4j.svg)](https://travis-ci.org/qos-ch/slf4j)
+# Search org.slf4j artifacts on Maven Central
+[![Maven Central](https://img.shields.io/badge/Search%20org%2Eslf4j%20artifacts%20on%20Maven%20Central-2.0.x-green)](https://central.sonatype.com/search?namespace=org.slf4j) 
 
 
+# In case of problems
+
+In case of problems please do not hesitate to post an e-mail message
+on the [slf4j-user@qos.ch](https://mailman.qos.ch/cgi-bin/mailman/listinfo/slf4j-user)
+mailing list or to start a <a
+href="https://github.com/qos-ch/slf4j/discussions">discussion</a> on
+github.  However, please do not directly e-mail SLF4J developers. The
+answer to your question might be useful to other users. Moreover,
+there are many knowledgeable users on the slf4j-user mailing lists who
+can quickly answer your questions.
+
+# Urgent issues
+
+For urgent issues do not hesitate to [champion a
+release](https://github.com/sponsors/qos-ch/sponsorships?tier_id=77436).
+In principle, most championed issues are solved within 3 business days
+ensued by a release.
+
 # How to build SLF4J
 
 SLF4J uses Maven as its build tool.
@@ -26,14 +45,13 @@ process:
 1. Start a discussion on the [slf4j-dev mailing
 list](http://www.slf4j.org/mailing-lists.html) about your proposed
 change. Alternately, file a [bug
-report](http://www.slf4j.org/bug-reporting.html) to initiate the
-discussion. Note that we ask pull requests to be linked to a [Jira
-ticket](https://jira.qos.ch/).
+report](https://github.com/qos-ch/slf4j/issues) on github to initiate the
+discussion. 
 
 2. Fork qos-ch/slf4j. Ideally, create a new branch from your fork for
 your contribution to make it easier to merge your changes back.
 
-3. Make your changes on the branch you hopefully created in Step 2. Be
+3. Make your changes on the branch created in Step 2. Be
 sure that your code passes existing unit tests. Please add unit tests
 for your work if appropriate. It usually is.
 
@@ -44,10 +62,8 @@ will be automatically rejected by the [DCO GitHub
 check](https://probot.github.io/apps/dco/) application.
 
 5. Push your changes to your fork/branch in GitHub. Don't push it to
-your master! If you do it will make it harder to submit new changes
+your master! If you do, it will make it harder to submit new changes
 later.
 
 6. Submit a pull request to SLF4J from your commit page on GitHub.
 
-7. Did we mention that you will be asked to link your pull request
-with a Jira ticket?

integration/build.xml

@@ -82,12 +82,12 @@
 	</target>
 
 	<target name="testAll" depends="init, 
-		        testNoProvider150,
+		            testNoProvider150,
                 testMismatch,
                 testMatch,
-		        testMultiBinding,                
-                testFuture_16Series,
-                testActiveSecurityManager">
+		            testMultiBinding,
+                testFuture_16Series"
+                >
 	</target>
 
 
@@ -201,7 +201,7 @@
     <property name="path_to_policy" value="file:./src/policy/java-under-ant.policy"/>
   </target>
 
-
+  <!-- no longer supported in JDK 24 and later -->
 	<target name="testActiveSecurityManager" depends="setPathToPolicy_FromTop, setPathToPolicy_FromIntegration">
 		<junit printsummary="yes" fork="no" haltonfailure="yes">
       <jvmarg value="-Djava.security.manager"/>

integration/pom.xml

@@ -7,7 +7,8 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>integration</artifactId>

integration/src/test/java/org/slf4j/CompatibilityAssertionTest.java

@@ -27,6 +27,7 @@ package org.slf4j;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
+import static org.slf4j.helpers.Reporter.SLF4J_INTERNAL_VERBOSITY_KEY;
 
 import java.io.PrintStream;
 import java.util.Random;
@@ -43,11 +44,13 @@ public class CompatibilityAssertionTest {
 
     @Before
     public void setUp() throws Exception {
+        System.setProperty(SLF4J_INTERNAL_VERBOSITY_KEY, "debug");
         System.setErr(sps);
     }
 
     @After
     public void tearDown() throws Exception {
+        System.clearProperty(SLF4J_INTERNAL_VERBOSITY_KEY);
         System.setErr(old);
     }
 
@@ -56,9 +59,13 @@ public class CompatibilityAssertionTest {
         Logger logger = LoggerFactory.getLogger(this.getClass());
         String msg = "hello world " + diff;
         logger.info(msg);
-        assertEquals(1, sps.stringList.size());
+        assertEquals(2, sps.stringList.size());
+
         String s0 = (String) sps.stringList.get(0);
-        assertTrue(s0.contains(msg));
+        assertTrue(s0.startsWith("SLF4J(D): Connected with provider of type [org.slf4j.simple.SimpleServiceProvider]"));
+
+        String s1 = (String) sps.stringList.get(1);
+        assertTrue(s1.contains(msg));
 
     }
 }

integration/src/test/java/org/slf4j/MultiBindingAssertionTest.java

@@ -55,11 +55,13 @@ public class MultiBindingAssertionTest {
         String msg = "hello world " + diff;
         logger.info(msg);
         List<String> list = sps.stringList;
-        assertMsgContains(list, 0, "Class path contains multiple SLF4J providers.");
-        assertMsgContains(list, 1, "Found provider");
-        assertMsgContains(list, 2, "Found provider");
-        assertMsgContains(list, 3, "See https://www.slf4j.org/codes.html#multiple_bindings for an explanation.");
-        assertMsgContains(list, 4, "Actual provider is of type [");
+        int line = 0;
+
+        assertMsgContains(list, line++, "Class path contains multiple SLF4J providers.");
+        assertMsgContains(list, line++, "Found provider");
+        assertMsgContains(list, line++, "Found provider");
+        assertMsgContains(list, line++, "See https://www.slf4j.org/codes.html#multiple_bindings for an explanation.");
+        //assertMsgContains(list, line++, "SLF4J(D): Connected with provider of type [");
     }
 
     void assertMsgContains(List<String> strList, int index, String msg) {

integration/src/test/java/org/slf4j/OutputVerifier.java

@@ -28,12 +28,12 @@ public class OutputVerifier {
         }
         {
             String s = (String) sps.stringList.get(2);
-            assertTrue(s.contains("SLF4J: See https://www.slf4j.org/codes.html#noProviders for further details."));
+            assertTrue(s.contains("See https://www.slf4j.org/codes.html#noProviders for further details."));
         }
 
         {
             String s = (String) sps.stringList.get(3);
-            assertTrue(s.contains("SLF4J: Class path contains SLF4J bindings targeting slf4j-api versions 1.7.x or earlier."));
+            assertTrue(s.contains("Class path contains SLF4J bindings targeting slf4j-api versions 1.7.x or earlier."));
         }
 
         {

jcl-over-slf4j/pom.xml

@@ -5,7 +5,8 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <modelVersion>4.0.0</modelVersion>
@@ -18,7 +19,7 @@
 
   <licenses>
     <license>
-      <name>Apache License, Version 2.0</name>
+      <name>Apache-2.0</name>
       <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
       <distribution>repo</distribution>
     </license>
@@ -27,7 +28,7 @@
   <properties>
     <module-name>org.apache.commons.logging</module-name>
   </properties>
-  
+
   <dependencies>
     <dependency>
       <groupId>org.slf4j</groupId>
@@ -39,5 +40,19 @@
       <scope>test</scope>
     </dependency>
   </dependencies>
+  <build>
+    <plugins>
 
+      <plugin>
+        <groupId>org.apache.felix</groupId>
+        <artifactId>maven-bundle-plugin</artifactId>
+        <configuration>
+          <instructions>
+            <_exportcontents>org.apache.commons.logging*;version=${jcl.version};-noimport:=true</_exportcontents>
+          </instructions>
+        </configuration>
+      </plugin>
+
+    </plugins>
+  </build>
 </project>

jcl-over-slf4j/src/main/resources/META-INF/MANIFEST.MF

@@ -1,9 +0,0 @@
-Implementation-Title: jcl-over-slf4j
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName: jcl.over.slf4j
-Bundle-Name: jcl-over-slf4j
-Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Export-Package: org.apache.commons.logging;version=1.2, 
-  org.apache.commons.logging.impl;version=1.2
-Import-Package: org.slf4j;version=${parsedVersion.osgiVersion}, org.slf4j.spi;version=${parsedVersion.osgiVersion}

jul-to-slf4j/LICENSE.txt

@@ -0,0 +1,24 @@
+Copyright (c) 2004-2022 QOS.ch Sarl (Switzerland)
+All rights reserved.
+
+Permission is hereby granted, free  of charge, to any person obtaining
+a  copy  of this  software  and  associated  documentation files  (the
+"Software"), to  deal in  the Software without  restriction, including
+without limitation  the rights to  use, copy, modify,  merge, publish,
+distribute,  sublicense, and/or sell  copies of  the Software,  and to
+permit persons to whom the Software  is furnished to do so, subject to
+the following conditions:
+
+The  above  copyright  notice  and  this permission  notice  shall  be
+included in all copies or substantial portions of the Software.
+
+THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
+EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
+MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+

jul-to-slf4j/pom.xml

@@ -7,7 +7,8 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>jul-to-slf4j</artifactId>
@@ -31,4 +32,9 @@
     </dependency>
   </dependencies>
 
+  <build>
+    <plugins>
+    </plugins>
+  </build>
+
 </project>

jul-to-slf4j/src/main/java9/module-info.java

@@ -0,0 +1,7 @@
+module jul.to.slf4j {
+
+    requires org.slf4j;
+    requires java.logging;
+
+    exports org.slf4j.bridge;
+}

jul-to-slf4j/src/main/resources/META-INF/MANIFEST.MF

@@ -1,8 +0,0 @@
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName: jul.to.slf4j
-Bundle-Name: jul-to-slf4j
-Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Export-Package: org.slf4j.bridge;version=${parsedVersion.osgiVersion};uses:="org.slf4j,org.slf4j.spi"
-Import-Package: org.slf4j;version=${parsedVersion.osgiVersion},org.slf4j.spi;version=${parsedVersion.osgiVersion}
-Automatic-Module-Name: jul.to.slf4j

log4j-over-slf4j/LICENSE.txt

@@ -0,0 +1,176 @@
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+   1. Definitions.
+
+      "License" shall mean the terms and conditions for use, reproduction,
+      and distribution as defined by Sections 1 through 9 of this document.
+
+      "Licensor" shall mean the copyright owner or entity authorized by
+      the copyright owner that is granting the License.
+
+      "Legal Entity" shall mean the union of the acting entity and all
+      other entities that control, are controlled by, or are under common
+      control with that entity. For the purposes of this definition,
+      "control" means (i) the power, direct or indirect, to cause the
+      direction or management of such entity, whether by contract or
+      otherwise, or (ii) ownership of fifty percent (50%) or more of the
+      outstanding shares, or (iii) beneficial ownership of such entity.
+
+      "You" (or "Your") shall mean an individual or Legal Entity
+      exercising permissions granted by this License.
+
+      "Source" form shall mean the preferred form for making modifications,
+      including but not limited to software source code, documentation
+      source, and configuration files.
+
+      "Object" form shall mean any form resulting from mechanical
+      transformation or translation of a Source form, including but
+      not limited to compiled object code, generated documentation,
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+
+      "Work" shall mean the work of authorship, whether in Source or
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+
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+   END OF TERMS AND CONDITIONS

log4j-over-slf4j/compatibility/build.xml

@@ -1,137 +0,0 @@
-<project name="testing-log4j-bridge" default="usage" basedir=".">
-
-	<property name="lbversion" value="0.9.8-SNAPSHOT" />
-    <property name="slf4jversion" value="1.4.2" />
-	<property name="source.home" value="./src/main/java/" />
-	<property name="javac.dest.12" value="./target/classes12/" />
-	<property name="javac.dest.13" value="./target/classes13/" />
-	<property name="lib" value="./lib" />
-
-	<property name="deprecation" value="on" />
-
-	<path id="basic.classpath">
-		<pathelement location="${source.home}" />
-		<pathelement location="${lib}/junit-3.8.1.jar" />
-	</path>
-
-	<path id="log4j12.classpath">
-		<path refid="basic.classpath" />
-		<pathelement location="${javac.dest.12}" />
-		<pathelement location="${lib}/log4j-1.2.14.jar" />
-	</path>
-
-	<path id="log4j13.classpath">
-		<path refid="basic.classpath" />
-		<pathelement location="${javac.dest.13}" />
-		<pathelement location="${lib}/log4j-1.3alpha-8.jar" />
-	</path>
-
-	<path id="los.classpath">
-		<path refid="basic.classpath" />
-		<pathelement location="${lib}/log4j-over-slf4j-${slf4jversion}.jar" />
-		<pathelement location="${lib}/logback-classic-${lbversion}.jar" />
-		<pathelement location="${lib}/logback-core-${lbversion}.jar" />
-		<pathelement location="${lib}/slf4j-api-${slf4jversion}.jar" />
-	</path>
-
-	<!-- ================================================================= -->
-	<!-- Default target                                                    -->
-	<!-- ================================================================= -->
-	<target name="usage">
-		<echo>      
-      These are some of the targets supported by this ANT build script:
-
-      all - run all available tests
-      refresh - copy required jar files to the lib directory
-    </echo>
-	</target>
-
-  <delete>
-    <fileset dir="." includes="**/*.bak"/>
-  </delete>
-
-  <target name="refresh">
-    <delete>
-      <fileset dir="lib">
-        <include name="logback-*.jar"/>
-        <include name="log4j-bridge-*.jar"/>
-      </fileset>
-    </delete>
-    <copy file="../../slf4j-api/target/slf4j-api-${slf4jversion}.jar" todir="lib/"/>
-    <copy file="../target/log4j-over-slf4j-${slf4jversion}.jar" todir="lib/"/>
-
-  </target>
-
-
-	<target name="init">
-		<mkdir dir="${javac.dest.12}" />
-		<mkdir dir="${javac.dest.13}" />
-	</target>
-
-	<target name="clean">
-		<delete>
-			<fileset dir="${javac.dest.12}" includes="**" />
-			<fileset dir="${javac.dest.13}" includes="**" />
-		</delete>
-	</target>
-
-	<target name="build_log4j12" depends="init">
-		<javac srcdir="${source.home}" 
-			     destdir="${javac.dest.12}" 
-			     includes="**/Log4j12Calls.java" 
-			     deprecation="${deprecation}" debug="on">
-			<classpath refid="log4j12.classpath" />
-		</javac>
-	</target>
-
-	<target name="build_log4j13" depends="init">
-		<javac srcdir="${source.home}" 
-			     destdir="${javac.dest.13}" 
-			     includes="**/Log4j13Calls.java" deprecation="${deprecation}" debug="on">
-			<classpath refid="log4j13.classpath" />
-		</javac>
-	</target>
-	
-	<target name="build_loggerTest" depends="init">
-		<javac srcdir="${source.home}" 
-			     destdir="${javac.dest.12}" 
-			     includes="**/LoggerTest.java" 
-			     deprecation="${deprecation}" debug="on">
-			<classpath refid="los.classpath" />
-		</javac>
-	</target>
-
-	<!-- ================================================================= -->
-	<!-- Run tests                                                     -->
-	<!-- ================================================================= -->
-	<target name="all" depends="test12, test13, loggerTest" />
-
-
-	<target name="loggerTest" depends="build_loggerTest">
-		<junit printsummary="yes" fork="yes" haltonfailure="yes">
-			<classpath refid="los.classpath" />
-			<classpath location="${javac.dest.12}" />
-			<formatter type="plain" usefile="false" />
-			<test name="test.LoggerTest" />
-		</junit>
-	</target>
-	
-	<target name="test12" depends="build_log4j12">
-		<junit printsummary="yes" fork="yes" haltonfailure="yes">
-			<classpath refid="los.classpath" />
-			<classpath location="${javac.dest.12}" />
-			<formatter type="plain" usefile="false" />
-			<test name="test.Log4j12Calls" />
-		</junit>
-	</target>
-
-	<target name="test13" depends="build_log4j13">
-		<junit printsummary="yes" fork="yes" haltonfailure="yes">
-			<classpath refid="los.classpath" />
-			<classpath location="${javac.dest.13}" />
-			<formatter type="plain" usefile="false" />
-			<test name="test.Log4j13Calls" />
-		</junit>
-	</target>
-
-</project>

log4j-over-slf4j/compatibility/readme.txt

@@ -1,17 +0,0 @@
-
-This directory is used to test the module against various log4j calls. 
-Two test cases simulate the typical calls that one can find in an application 
-that uses either log4j 1.2.x, or log4j 1.3.x.
-
-In the same directory is a build.xml file that uses ant to 
-compile the test cases with the corresponding log4j version, 
-and to run these tests without log4j in the classpath but with
-logback jars instead.
-
-To run the tests, one must have ant installed. Issuing the following command, 
-once in the compatibility directory will launch the tests:
-
-ant all
-
-To obtain more information about the use of the log4j-over-slf4j module, 
-please visit http://www.slf4j.org/log4j-over-slf4j.html

log4j-over-slf4j/compatibility/src/main/java/test/DummyObject.java

@@ -1,8 +0,0 @@
-package test;
-
-public class DummyObject {
-
-  public String toString() {
-    return "dummy";
-  }
-}

log4j-over-slf4j/compatibility/src/main/java/test/Log4j12Calls.java

@@ -1,39 +0,0 @@
-/**
- * Logback: the reliable, generic, fast and flexible logging framework.
- * 
- * Copyright (C) 1999-2006, QOS.ch
- * 
- * This library is free software, you can redistribute it and/or modify it under
- * the terms of the GNU Lesser General Public License as published by the Free
- * Software Foundation.
- */
-package test;
-
-import junit.framework.TestCase;
-
-import org.apache.log4j.Logger;
-import org.apache.log4j.MDC;
-
-/**
- * 
- * A test case that issues the typical calls
- * that an application using log4j 1.2 would do.
- *
- * @author Ceki Gülcü
- * @author Sébastien Pennec
- */
-public class Log4j12Calls extends TestCase {
-  public static final Logger logger = Logger.getLogger(Log4j12Calls.class);
-  
-  public void testLog() {
-    MDC.put("key", "value1");
-    
-    logger.trace("Trace level can be noisy");
-    logger.debug("Entering application");
-    logger.info("Violets are blue");
-    logger.warn("Here is a warning");
-    logger.error("Exiting application", new Exception("just testing"));
-    
-    MDC.remove("key");
-  }
-}

log4j-over-slf4j/compatibility/src/main/java/test/Log4j13Calls.java

@@ -1,46 +0,0 @@
-/**
- * Logback: the reliable, generic, fast and flexible logging framework.
- * 
- * Copyright (C) 1999-2006, QOS.ch
- * 
- * This library is free software, you can redistribute it and/or modify it under
- * the terms of the GNU Lesser General Public License as published by the Free
- * Software Foundation.
- */
-
-package test;
-
-import junit.framework.TestCase;
-
-import org.apache.log4j.Logger;
-import org.apache.log4j.MDC;
-
-/**
- * 
- * A test case that issues the typical calls
- * that an application using log4j 1.3 would do.
- *
- * @author Ceki Gülcü
- * @author Sébastien Pennec
- */
-
-public class Log4j13Calls extends TestCase {
-  public static final Logger logger = Logger.getLogger(Log4j12Calls.class);
-  
-  public void testLog() {
-    MDC.put("key", "value1");
-    
-    logger.trace("Trace level can be noisy");
-    logger.debug("Entering application");
-    logger.info("Violets are blue");
-    logger.warn("Here is a warning");
-    logger.info("The answer is {}.", new Integer(42));
-    logger.info("Number: {} and another one: {}.", new Integer(42), new Integer(24));
-    
-    logger.error("Exiting application", new Exception("just testing"));
-    
-    MDC.remove("key");
-    
-    MDC.clear();
-  }
-}

log4j-over-slf4j/compatibility/src/main/java/test/LoggerTest.java

@@ -1,169 +0,0 @@
-package test;
-
-import junit.framework.TestCase;
-
-import org.slf4j.LoggerFactory;
-
-import ch.qos.logback.classic.LoggerContext;
-import ch.qos.logback.classic.spi.LoggingEvent;
-import ch.qos.logback.core.read.ListAppender;
-import org.apache.log4j.Level;
-
-/**
- * A class that tests the invocation of the org.apache.log4j.Logger class that
- * belongs to the log4j-bridge package
- * 
- * @author Sébastien Pennec
- * @author Ceki Gülcü
- */
-
-public class LoggerTest extends TestCase {
-
-  LoggerContext context;
-  ListAppender<LoggingEvent> appender;
-  ch.qos.logback.classic.Logger logbackLogger;
-  org.apache.log4j.Logger log4jLogger;
-
-  public void setUp() throws Exception {
-    context = (LoggerContext) LoggerFactory.getILoggerFactory();
-    context.shutdownAndReset();
-    appender = new ListAppender<LoggingEvent>();
-    appender.setContext(context);
-    appender.setName("listAppender");
-    appender.start();
-    ch.qos.logback.classic.Logger lbLogger = context
-        .getLogger(LoggerContext.ROOT_NAME);
-    lbLogger.addAppender(appender);
-
-    log4jLogger = org.apache.log4j.Logger.getLogger(LoggerTest.class);
-    logbackLogger = context.getLogger(LoggerTest.class);
-    super.setUp();
-  }
-
-  public void tearDown() throws Exception {
-    appender.stop();
-    context.stop();
-    appender = null;
-    context = null;
-    logbackLogger = null; 
-    log4jLogger = null;
-    super.tearDown();
-  }
-
-  public void testLogWithObjectMessages() {
-    LoggingEvent event;
-
-    log4jLogger.debug("test");
-    event = appender.list.get(0);
-    assertEquals("test", event.getMessage());
-    appender.list.clear();
-
-    log4jLogger.debug(null);
-    event = appender.list.get(0);
-    assertEquals(null, event.getMessage());
-    appender.list.clear();
-
-    DummyObject dummy = new DummyObject();
-    log4jLogger.debug(dummy);
-    event = appender.list.get(0);
-    assertEquals(dummy.toString(), event.getMessage());
-    appender.list.clear();
-  }
-
-  public void testIsEnabledAPI() {
-    assertFalse(log4jLogger.isTraceEnabled());
-    assertTrue(log4jLogger.isDebugEnabled());
-    assertTrue(log4jLogger.isInfoEnabled());
-    assertTrue(log4jLogger.isWarnEnabled());
-    assertTrue(log4jLogger.isErrorEnabled());
-  }
-
-  public void testPrintAPI() {
-    Exception e = new Exception("just testing");
-
-    log4jLogger.trace(null);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-    
-    log4jLogger.debug(null);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.debug("debug message");
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.info(null);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.info("info  message");
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.warn(null);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.warn("warn message");
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.error(null);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.error("error message");
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.debug(null, e);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.debug("debug message", e);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.info(null, e);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.info("info  message", e);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.warn(null, e);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.warn("warn message", e);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.error(null, e);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-    log4jLogger.error("error message", e);
-    assertEquals(1, appender.list.size());
-    appender.list.clear();
-
-  }
-  
-  public void testLogAPI() {
-    log4jLogger.log("x", Level.TRACE, "x", null);
-    assertEquals(0, appender.list.size());
-
-    log4jLogger.log("x", Level.DEBUG, "x", null);
-    log4jLogger.log("x", Level.INFO, "x", null);
-    log4jLogger.log("x", Level.WARN, "x", null);
-    log4jLogger.log("x", Level.ERROR, "x", null);
-    log4jLogger.log("x", Level.FATAL, "x", null);
-
-    assertEquals(5, appender.list.size());
-    appender.list.clear();
-
-  }
-
-}

log4j-over-slf4j/pom.xml

@@ -7,7 +7,8 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
 
@@ -20,8 +21,8 @@
 
   <licenses>
     <license>
-      <name>Apache Software Licenses</name>
-      <url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
+      <name>Apache-2.0</name>
+      <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
     </license>
   </licenses>
 
@@ -41,4 +42,20 @@
     </dependency>
   </dependencies>
 
+  <build>
+    <plugins>
+
+      <plugin>
+        <groupId>org.apache.felix</groupId>
+        <artifactId>maven-bundle-plugin</artifactId>
+        <configuration>
+          <instructions>
+            <_exportcontents>org.apache.log4j*;version=${reload4j.version};-noimport:=true</_exportcontents>
+          </instructions>
+        </configuration>
+      </plugin>
+
+    </plugins>
+  </build>
+
 </project>

log4j-over-slf4j/src/main/resources/META-INF/MANIFEST.MF

@@ -1,13 +0,0 @@
-Implementation-Title: log4j-over-slf4j
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName: log4j.over.slf4j
-Bundle-Name: log4j-over-slf4j
-Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Export-Package: org.apache.log4j;version=${reload4j.version},
- org.apache.log4j.helpers;version=${reload4j.version},
- org.apache.log4j.spi;version=${reload4j.version},
- org.apache.log4j.xml;version=${reload4j.version}
-Import-Package: org.slf4j;version=${slf4j.api.minimum.compatible.version},
- org.slf4j.helpers;version=${slf4j.api.minimum.compatible.version},
- org.slf4j.spi;version=${slf4j.api.minimum.compatible.version}

osgi-over-slf4j/LICENSE.txt

@@ -0,0 +1,24 @@
+Copyright (c) 2004-2022 QOS.ch Sarl (Switzerland)
+All rights reserved.
+
+Permission is hereby granted, free  of charge, to any person obtaining
+a  copy  of this  software  and  associated  documentation files  (the
+"Software"), to  deal in  the Software without  restriction, including
+without limitation  the rights to  use, copy, modify,  merge, publish,
+distribute,  sublicense, and/or sell  copies of  the Software,  and to
+permit persons to whom the Software  is furnished to do so, subject to
+the following conditions:
+
+The  above  copyright  notice  and  this permission  notice  shall  be
+included in all copies or substantial portions of the Software.
+
+THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
+EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
+MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+

osgi-over-slf4j/pom.xml

@@ -7,7 +7,8 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>osgi-over-slf4j</artifactId>
@@ -37,8 +38,27 @@
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-simple</artifactId>
-      <version>${project.version}</version>
       <scope>provided</scope>
     </dependency>
   </dependencies>
+
+  <build>
+    <plugins>
+
+      <plugin>
+        <groupId>org.apache.felix</groupId>
+        <artifactId>maven-bundle-plugin</artifactId>
+        <configuration>
+          <instructions>
+            <Bundle-SymbolicName>org.slf4j.osgi-over-slf4j</Bundle-SymbolicName>
+            <Bundle-Activator>org.slf4j.osgi.logservice.impl.Activator</Bundle-Activator>
+            <Bundle-Category>osgi</Bundle-Category>
+            <_exportcontents combine.self="override" />
+          </instructions>
+        </configuration>
+      </plugin>
+
+    </plugins>
+  </build>
+
 </project>

osgi-over-slf4j/src/main/resources/META-INF/MANIFEST.MF

@@ -1,8 +0,0 @@
-Implementation-Title: osgi-over-slf4j
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName: org.slf4j.osgi-over-slf4j
-Bundle-Name: OSGi LogService implemented over SLF4J
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Bundle-Activator: org.slf4j.osgi.logservice.impl.Activator
-Bundle-Category: osgi
-Import-Package: org.osgi.framework;version="[1.5,2)",org.osgi.service.log;version="[1.3,2)",org.slf4j;version=${parsedVersion.osgiVersion}

parent/pom.xml

@@ -0,0 +1,397 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+  <modelVersion>4.0.0</modelVersion>
+
+  <parent>
+    <groupId>org.slf4j</groupId>
+    <artifactId>slf4j-bom</artifactId>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../pom.xml</relativePath>
+  </parent>
+
+  <artifactId>slf4j-parent</artifactId>
+  <packaging>pom</packaging>
+  <name>SLF4J Parent POM</name>
+  <description>SLF4J project parent pom.xml file</description>
+
+
+  <organization>
+    <name>QOS.ch</name>
+    <url>http://www.qos.ch</url>
+  </organization>
+  <inceptionYear>2005</inceptionYear>
+
+
+  <properties>
+    <!-- yyyy-MM-dd'T'HH:mm:ss'Z' -->
+    <project.build.outputTimestamp>2026-05-12T18:37:04Z</project.build.outputTimestamp>
+    <latest.1.version>1.7.36</latest.1.version>
+    <!-- java.util.ServiceLoader requires Java 6 -->
+    <jdk.version>8</jdk.version>
+    <maven.compiler.source>${jdk.version}</maven.compiler.source>
+    <maven.compiler.target>${jdk.version}</maven.compiler.target>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <project.build.resourceEncoding>UTF-8</project.build.resourceEncoding>
+    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+    <!-- used in integration testing -->
+    <cal10n.version>0.8.1</cal10n.version>
+    <reload4j.version>1.2.22</reload4j.version>
+    <logback.version>1.2.10</logback.version>
+    <jcl.version>1.2</jcl.version>
+    <junit.version>4.13.1</junit.version>
+    <maven-site-plugin.version>3.7.1</maven-site-plugin.version>
+    <maven-compiler-plugin.version>3.10.1</maven-compiler-plugin.version>
+    <maven-surefire-plugin.version>3.0.0-M7</maven-surefire-plugin.version>
+    <maven-javadoc-plugin.version>3.6.3</maven-javadoc-plugin.version>
+    <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
+    <maven-deploy-plugin.version>3.0.0-M1</maven-deploy-plugin.version>
+    <maven-jar-plugin.version>3.2.0</maven-jar-plugin.version>
+    <maven-jxr-plugin.version>3.1.1</maven-jxr-plugin.version>
+    <maven-bundle-plugin.version>5.1.9</maven-bundle-plugin.version>
+  </properties>
+
+
+  <dependencies>
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>${junit.version}</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <dependencyManagement>
+    <dependencies>
+
+      <dependency>
+        <groupId>ch.qos.reload4j</groupId>
+        <artifactId>reload4j</artifactId>
+        <version>${reload4j.version}</version>
+      </dependency>
+
+      <dependency>
+        <groupId>ch.qos.cal10n</groupId>
+        <artifactId>cal10n-api</artifactId>
+        <version>${cal10n.version}</version>
+      </dependency>
+
+    </dependencies>
+  </dependencyManagement>
+
+  <build>
+    <extensions>
+      <extension>
+        <groupId>org.apache.maven.wagon</groupId>
+        <artifactId>wagon-ssh</artifactId>
+        <version>2.10</version>
+      </extension>
+    </extensions>
+
+    <resources>
+      <resource>
+        <directory>${project.basedir}/src/main/resources</directory>
+        <filtering>true</filtering>
+      </resource>
+
+      <resource>
+        <directory>..</directory>
+        <targetPath>META-INF</targetPath>
+        <includes>
+          <include>LICENSE.txt</include>
+        </includes>
+      </resource>
+    </resources>
+
+    <pluginManagement>
+      <plugins>
+
+        <plugin>
+          <groupId>org.codehaus.mojo</groupId>
+          <artifactId>animal-sniffer-maven-plugin</artifactId>
+          <version>1.14</version>
+          <configuration>
+            <signature>
+              <groupId>org.codehaus.mojo.signature</groupId>
+              <artifactId>java16</artifactId>
+              <version>1.0</version>
+            </signature>
+          </configuration>
+        </plugin>
+
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-deploy-plugin</artifactId>
+          <version>${maven-deploy-plugin.version}</version>
+        </plugin>
+
+      </plugins>
+    </pluginManagement>
+
+    <plugins>
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>${maven-compiler-plugin.version}</version>
+        <executions>
+
+          <execution>
+            <id>default-compile</id>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+            <configuration>
+              <source>${jdk.version}</source>
+              <target>${jdk.version}</target>
+            </configuration>
+          </execution>
+
+          <execution>
+            <id>module-compile</id>
+            <phase>compile</phase>
+            <goals>
+              <goal>compile</goal>
+            </goals>
+            <configuration>
+              <release>9</release>
+              <compileSourceRoots>
+                <compileSourceRoot>${project.basedir}/src/main/java9</compileSourceRoot>
+              </compileSourceRoots>
+              <multiReleaseOutput>true</multiReleaseOutput>
+            </configuration>
+          </execution>
+
+
+        </executions>
+
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>${maven-jar-plugin.version}</version>
+        <executions>
+          <!--  Repeated in slf4j-api/pom.xml -->
+          <execution>
+            <id>default-jar</id>
+            <phase>package</phase>
+            <goals>
+              <goal>jar</goal>
+            </goals>
+            <configuration>
+              <archive>
+                <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
+              </archive>
+              <skipIfEmpty>true</skipIfEmpty>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.felix</groupId>
+        <artifactId>maven-bundle-plugin</artifactId>
+        <version>${maven-bundle-plugin.version}</version>
+        <configuration>
+          <supportIncrementalBuild>true</supportIncrementalBuild>
+          <!-- populated by the plugin itself -->
+          <instructions>
+            <Bundle-SymbolicName>${replacestring;${project.artifactId};-;.}</Bundle-SymbolicName>
+            <Bundle-Vendor>SLF4J.ORG</Bundle-Vendor>
+            <_snapshot/>
+            <_exportcontents>!META-INF.versions.9,*;-noimport:=true</_exportcontents>
+            <Bundle-Description>${project.description}</Bundle-Description>
+            <Bundle-DocURL>${project.url}</Bundle-DocURL>
+            <X-Compile-Source-JDK>${maven.compiler.source}</X-Compile-Source-JDK>
+            <X-Compile-Target-JDK>${maven.compiler.target}</X-Compile-Target-JDK>
+            <Implementation-Version>${project.version}</Implementation-Version>
+            <Implementation-Title>${project.artifactId}</Implementation-Title>
+            <Multi-Release>true</Multi-Release>
+            <_removeheaders>Private-Package,Bundle-SCM, Bundle-Developers, Include-Resource</_removeheaders>
+          </instructions>
+        </configuration>
+        <executions>
+          <execution>
+            <id>bundle-manifest</id>
+            <phase>process-classes</phase>
+            <goals>
+              <goal>manifest</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>${maven-surefire-plugin.version}</version>
+        <configuration>
+          <forkCount>1</forkCount>
+          <reuseForks>false</reuseForks>
+          <reportFormat>plain</reportFormat>
+          <trimStackTrace>false</trimStackTrace>
+          <excludes>
+            <exclude>**/AllTest.java</exclude>
+            <exclude>**/PackageTest.java</exclude>
+          </excludes>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-source-plugin</artifactId>
+        <version>${maven-source-plugin.version}</version>
+        <executions>
+          <execution>
+            <phase>package</phase>
+            <goals>
+              <goal>jar</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-site-plugin</artifactId>
+        <version>${maven-site-plugin.version}</version>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-project-info-reports-plugin</artifactId>
+        <version>3.0.0</version>
+      </plugin>
+    </plugins>
+
+  </build>
+
+  <profiles>
+    <profile>
+      <id>skipTests</id>
+      <properties>
+        <maven.test.skip>true</maven.test.skip>
+      </properties>
+    </profile>
+
+    <profile>
+      <id>javadocjar</id>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-javadoc-plugin</artifactId>
+            <version>${maven-javadoc-plugin.version}</version>
+            <executions>
+              <execution>
+                <id>attach-javadocs</id>
+                <goals>
+                  <goal>jar</goal>
+                </goals>
+              </execution>
+            </executions>
+            <configuration>
+              <additionalparam>-Xdoclint:none</additionalparam>
+              <failOnError>false</failOnError>
+              <sourceFileExcludes>
+                <sourceFileExclude>**/module-info.java</sourceFileExclude>
+              </sourceFileExcludes>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+
+    <profile>
+      <id>license</id>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>com.google.code.maven-license-plugin</groupId>
+            <artifactId>maven-license-plugin</artifactId>
+            <configuration>
+              <header>src/main/licenseHeader.txt</header>
+              <quiet>false</quiet>
+              <failIfMissing>true</failIfMissing>
+              <aggregate>true</aggregate>
+              <includes>
+                <include>src/**/*.java</include>
+              </includes>
+              <useDefaultExcludes>true</useDefaultExcludes>
+              <useDefaultMapping>true</useDefaultMapping>
+              <properties>
+                <year>1999</year>
+              </properties>
+              <headerDefinitions>
+                <headerDefinition>src/main/javadocHeaders.xml</headerDefinition>
+              </headerDefinitions>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
+
+      <pluginRepositories>
+      </pluginRepositories>
+    </profile>
+
+
+    <profile>
+      <id>generate-osgi-service-loader-mediator-entries</id>
+      <activation>
+        <file>
+          <exists>src/main/resources/META-INF/services/org.slf4j.spi.SLF4JServiceProvider</exists>
+        </file>
+      </activation>
+      <build>
+        <!-- Add the OSGi Service Loader Mediator Specification Manifest entries for each module that has a SLF4JServiceProvider Service-Loader file.-->
+        <plugins>
+          <plugin>
+            <groupId>org.apache.felix</groupId>
+            <artifactId>maven-bundle-plugin</artifactId>
+            <configuration>
+              <instructions>
+                <Provide-Capability><![CDATA[
+                  osgi.service;objectClass:List<String>="org.slf4j.spi.SLF4JServiceProvider";type=${slf4j.provider.type};effective:=active,
+                  osgi.serviceloader;osgi.serviceloader="org.slf4j.spi.SLF4JServiceProvider";register:="${slf4j.provider.implementation}";type=${slf4j.provider.type}
+                ]]></Provide-Capability>
+                <Require-Capability><![CDATA[
+                  osgi.extender;filter:="(&(osgi.extender=osgi.serviceloader.registrar)(version>=1.0.0)(!(version>=2.0.0)))"
+                ]]></Require-Capability>
+              </instructions>
+            </configuration>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+
+    <!--
+    <profile>
+      <id>travis</id>
+      <activation>
+        <property>
+          <name>env.TRAVIS</name>
+          <value>true</value>
+        </property>
+      </activation>
+      <build>
+        <plugins>
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-toolchains-plugin</artifactId>
+            <version>1.1</version>
+            <executions>
+              <execution>
+                <id>toolchain</id>
+                <phase>none</phase>
+              </execution>
+            </executions>
+          </plugin>
+        </plugins>
+      </build>
+    </profile>
+    -->
+  </profiles>
+
+
+</project>

pom.xml

@@ -5,80 +5,41 @@
   <modelVersion>4.0.0</modelVersion>
 
   <groupId>org.slf4j</groupId>
-  <artifactId>slf4j-parent</artifactId>
-  <version>2.0.3</version>
-
+  <artifactId>slf4j-bom</artifactId>
+  <version>2.0.19-SNAPSHOT</version>
   <packaging>pom</packaging>
-  <name>SLF4J</name>
-  <description>Top SLF4J project pom.xml file</description>
+
   <url>http://www.slf4j.org</url>
 
-  <organization>
-    <name>QOS.ch</name>
-    <url>http://www.qos.ch</url>
-  </organization>
-  <inceptionYear>2005</inceptionYear>
+  <name>SLF4J BOM</name>
+  <description>SLF4J project BOM</description>
 
   <licenses>
     <license>
-      <name>MIT License</name>
-      <url>http://www.opensource.org/licenses/mit-license.php</url>
+      <name>MIT</name>
+      <url>https://opensource.org/license/mit</url>
       <distribution>repo</distribution>
     </license>
   </licenses>
 
+
   <scm>
     <url>https://github.com/qos-ch/slf4j</url>
     <connection>scm:git:https://github.com/qos-ch/slf4j.git</connection>
-  </scm>  
+  </scm>
 
-  <properties>
-    <!-- yyyy-MM-dd'T'HH:mm:ss'Z' -->
-    <project.build.outputTimestamp>2022-09-28T10:14:00Z</project.build.outputTimestamp>    
-    <latest.stable.version>1.7.36</latest.stable.version>
-    <latest.2.version>2.0.0-alpha7</latest.2.version>    
-    <!-- java.util.ServiceLoader requires Java 6 -->
-    <jdk.version>8</jdk.version>
-    <maven.compiler.source>${jdk.version}</maven.compiler.source>
-    <maven.compiler.target>${jdk.version}</maven.compiler.target>
-    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <project.build.resourceEncoding>UTF-8</project.build.resourceEncoding>
-    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-    <!-- used in integration testing -->
-    <slf4j.api.minimum.compatible.version>1.6.0</slf4j.api.minimum.compatible.version>
-    <cal10n.version>0.8.1</cal10n.version>
-    <reload4j.version>1.2.22</reload4j.version>    
-    <log4j.version>1.2.17</log4j.version>
-    <logback.version>1.2.10</logback.version>
-    <junit.version>4.13.1</junit.version>
-    <maven-site-plugin.version>3.7.1</maven-site-plugin.version>
-    <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
-    <maven-surefire-plugin.version>3.0.0-M5</maven-surefire-plugin.version>
-    <maven-javadoc-plugin.version>3.1.0</maven-javadoc-plugin.version>
-    <maven-source-plugin.version>3.2.1</maven-source-plugin.version>
-    <maven-deploy-plugin.version>3.0.0-M1</maven-deploy-plugin.version>
-    <maven-jar-plugin.version>3.2.0</maven-jar-plugin.version>
-    <maven-jxr-plugin.version>3.1.1</maven-jxr-plugin.version>
-    <build-helper-maven-plugin.version>3.2.0</build-helper-maven-plugin.version>
-            
-  </properties>
-
-  <developers>
-    <developer>
-      <id>ceki</id>
-      <name>Ceki Gulcu</name>
-      <email>ceki@qos.ch</email>
-    </developer>
-  </developers>
 
+  <!-- Inspired by Improving the Maven Bill of Materials (BOM) Pattern  -->
+  <!-- https://www.garretwilson.com/blog/2023/06/14/improve-maven-bom-pattern -->
   <modules>
+    <module>parent</module>
     <module>slf4j-api</module>
     <module>slf4j-simple</module>
     <module>slf4j-nop</module>
     <module>slf4j-jdk14</module>
     <module>slf4j-jdk-platform-logging</module>
     <module>slf4j-log4j12</module>
-    <module>slf4j-reload4j</module>    
+    <module>slf4j-reload4j</module>
     <module>slf4j-ext</module>
     <module>jcl-over-slf4j</module>
     <module>log4j-over-slf4j</module>
@@ -86,17 +47,11 @@
     <module>osgi-over-slf4j</module>
     <module>integration</module>
     <module>slf4j-migrator</module>
-
   </modules>
 
-  <dependencies>
-    <dependency>
-      <groupId>junit</groupId>
-      <artifactId>junit</artifactId>
-      <version>${junit.version}</version>
-      <scope>test</scope>
-    </dependency>
-  </dependencies>
+  <properties>
+      <central-publishing-maven-plugin.version>0.9.0</central-publishing-maven-plugin.version>
+  </properties>
 
   <dependencyManagement>
     <dependencies>
@@ -107,341 +62,183 @@
         <version>${project.version}</version>
       </dependency>
 
-      <dependency>
-        <groupId>org.slf4j</groupId>
-        <artifactId>slf4j-jdk14</artifactId>
-        <version>${project.version}</version>
-      </dependency>
-
-      
       <dependency>
         <groupId>org.slf4j</groupId>
         <artifactId>slf4j-simple</artifactId>
         <version>${project.version}</version>
       </dependency>
 
- 
       <dependency>
-        <groupId>log4j</groupId>
-        <artifactId>log4j</artifactId>
-        <version>${log4j.version}</version>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-nop</artifactId>
+        <version>${project.version}</version>
       </dependency>
 
       <dependency>
-        <groupId>ch.qos.reload4j</groupId>
-        <artifactId>reload4j</artifactId>
-        <version>${reload4j.version}</version>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-jdk14</artifactId>
+        <version>${project.version}</version>
       </dependency>
-      
+
+
       <dependency>
-        <groupId>ch.qos.cal10n</groupId>
-        <artifactId>cal10n-api</artifactId>
-        <version>${cal10n.version}</version>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-jdk-platform-logging</artifactId>
+        <version>${project.version}</version>
       </dependency>
 
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-log4j12</artifactId>
+        <version>${project.version}</version>
+      </dependency>
+
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-reload4j</artifactId>
+        <version>${project.version}</version>
+      </dependency>
+
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>slf4j-ext</artifactId>
+        <version>${project.version}</version>
+      </dependency>
+
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>jcl-over-slf4j</artifactId>
+        <version>${project.version}</version>
+      </dependency>
+
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>log4j-over-slf4j</artifactId>
+        <version>${project.version}</version>
+      </dependency>
+
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>jul-to-slf4j</artifactId>
+        <version>${project.version}</version>
+      </dependency>
+
+      <dependency>
+        <groupId>org.slf4j</groupId>
+        <artifactId>osgi-over-slf4j</artifactId>
+        <version>${project.version}</version>
+      </dependency>
+
+
     </dependencies>
   </dependencyManagement>
 
+  <distributionManagement>
+
+    <repository>
+      <id>sonatype-nexus-staging</id>
+      <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
+    </repository>
+
+  </distributionManagement>
+
+  <developers>
+    <developer>
+      <id>ceki</id>
+      <name>Ceki Gulcu</name>
+      <email>ceki@qos.ch</email>
+    </developer>
+  </developers>
+
   <build>
-    <extensions>
-      <extension>
-        <groupId>org.apache.maven.wagon</groupId>
-        <artifactId>wagon-ssh</artifactId>
-        <version>2.10</version>
-      </extension>
-    </extensions>
-
-    <resources>
-      <resource>
-        <directory>${project.basedir}/src/main/resources</directory>
-        <filtering>true</filtering>
-      </resource>
-    </resources>
-
-    <pluginManagement>
-      <plugins>
-
-        <plugin>
-          <groupId>org.codehaus.mojo</groupId>
-          <artifactId>animal-sniffer-maven-plugin</artifactId>
-          <version>1.14</version>
-          <configuration>
-            <signature>
-              <groupId>org.codehaus.mojo.signature</groupId>
-              <artifactId>java16</artifactId>
-              <version>1.0</version>
-            </signature>
-          </configuration>
-        </plugin>
-
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-deploy-plugin</artifactId>
-          <version>${maven-deploy-plugin.version}</version>
-        </plugin>
-
-      </plugins>
-    </pluginManagement>
-
     <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <version>${maven-compiler-plugin.version}</version>
-        <executions>
-
-          <execution>
-            <id>default-compile</id>
-            <goals>
-              <goal>compile</goal>
-            </goals>
-            <configuration>
-              <source>${jdk.version}</source>
-              <target>${jdk.version}</target>
-            </configuration>
-          </execution> 
-
-          <execution>                      
-            <id>module-compile</id>
-            <phase>compile</phase>
-            <goals>
-              <goal>compile</goal>
-            </goals>          
-            <configuration>
-              <release>9</release>
-              <compileSourceRoots>
-                <compileSourceRoot>${project.basedir}/src/main/java9</compileSourceRoot>
-              </compileSourceRoots>
-              <multiReleaseOutput>true</multiReleaseOutput>
-            </configuration>
-          </execution>
-
-
-
-        </executions>
-
-      </plugin>
-
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-jar-plugin</artifactId>
-        <version>${maven-jar-plugin.version}</version>
-        <executions>
-          <!--  Repeated in slf4j-api/pom.xml -->
-          <execution>
-            <id>default-jar</id>
-            <phase>package</phase>
-            <goals>
-              <goal>jar</goal>
-            </goals>
-            <configuration>
-              <archive>
-                <manifestEntries>
-                  <Bundle-Version>${parsedVersion.osgiVersion}</Bundle-Version>
-                  <Bundle-Description>${project.description}</Bundle-Description>
-                  <X-Compile-Source-JDK>${maven.compiler.source}</X-Compile-Source-JDK>
-                  <X-Compile-Target-JDK>${maven.compiler.target}</X-Compile-Target-JDK>
-                  <Implementation-Version>${project.version}</Implementation-Version>
-                  <Multi-Release>true</Multi-Release>
-                </manifestEntries>
-                <manifestFile>${project.build.outputDirectory}/META-INF/MANIFEST.MF</manifestFile>
-              </archive>
-              <skipIfEmpty>true</skipIfEmpty>
-            </configuration>
-          </execution>
-        </executions>
-      </plugin>
- 
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-surefire-plugin</artifactId>
-        <version>${maven-surefire-plugin.version}</version>
-        <configuration>
-          <forkCount>1</forkCount>
-          <reuseForks>false</reuseForks>
-          <reportFormat>plain</reportFormat>
-          <trimStackTrace>false</trimStackTrace>
-          <excludes>
-            <exclude>**/AllTest.java</exclude>
-            <exclude>**/PackageTest.java</exclude>
-          </excludes>
-        </configuration>
-      </plugin>
-
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-source-plugin</artifactId>
-        <version>${maven-source-plugin.version}</version>
-        <executions>
-          <execution>
-            <phase>package</phase>
-            <goals>
-              <goal>jar</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
-
-      <!-- as suggested in http://jira.qos.ch/browse/SLF4J-143 -->
-      <plugin>
-        <groupId>org.codehaus.mojo</groupId>
-        <artifactId>build-helper-maven-plugin</artifactId>
-        <version>${build-helper-maven-plugin.version}</version>
-        <executions>
-          <execution>
-            <id>parse-version</id>
-            <goals>
-              <goal>parse-version</goal>
-            </goals>
-          </execution>
-        </executions>
-      </plugin>
-
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-site-plugin</artifactId>
-        <version>${maven-site-plugin.version}</version>
-      </plugin>
-
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-project-info-reports-plugin</artifactId>
-        <version>3.0.0</version>
-      </plugin>
-    </plugins>
-  
-  </build>
-
-  <reporting>
-    <plugins>
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-jxr-plugin</artifactId>
-        <version>${maven-jxr-plugin.version}</version>
-        <configuration>
-          <aggregate>true</aggregate>
-          <javadocDir>target/site/apidocs/</javadocDir>
-          <linkJavadoc>true</linkJavadoc>
-        </configuration>
-      </plugin>
-      
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>${maven-javadoc-plugin.version}</version>
+        <version>3.6.3</version>
         <configuration>
-          <linkJavadoc>true</linkJavadoc>
+          <verbose>true</verbose>
+          <skippedModules>
+             slf4j-jdk-platform-logging,slf4j-migrator,osgi-over-slf4j
+          </skippedModules>
+          <detectLinks>true</detectLinks>
+          <doctitle>SLF4J project modules ${project.version}</doctitle>
+          <windowtitle>SLF4J javadoc</windowtitle>
+          <bottom><![CDATA[Copyright  &copy; 2005-{currentYear} QOS.CH Sarl. All rights reserved]]></bottom>
           <linksource>true</linksource>
-          <aggregate>true</aggregate>
           <additionalOptions>
             <additionalOption>-Xdoclint:none</additionalOption>
           </additionalOptions>
-          <excludePackageNames>org.slf4j.migrator:org.slf4j.migrator.*</excludePackageNames>
-          <sourceFileExcludes>
-            <sourceFileExclude>**/module-info.java</sourceFileExclude>
-          </sourceFileExcludes>
-          
           <groups>
             <group>
-              <title>SLF4J packages</title>
-              <packages>org.slf4j:org.slf4j.*</packages>
+              <title>SLF4J API packages</title>
+              <packages>org.slf4j:org.slf4j.spi:org.slf4j.event:org.slf4j.helpers</packages>
             </group>
-            
+
+            <group>
+              <title>slf4j-simple package</title>
+              <packages>org.slf4j.simple</packages>
+            </group>
+
+            <group>
+              <title>slf4j-nop package</title>
+              <packages>org.slf4j.nop</packages>
+            </group>
+
+
+            <group>
+              <title>slf4j-jdk14 package</title>
+              <packages>org.slf4j.jul</packages>
+            </group>
+
+
+            <group>
+              <title>slf4j-reload4j package</title>
+              <packages>org.slf4j.reload4j</packages>
+            </group>
+
+
             <group>
               <title>SLF4J extensions</title>
               <packages>
                 org.slf4j.cal10n:org.slf4j.profiler:org.slf4j.ext:org.slf4j.instrumentation:org.slf4j.agent
               </packages>
             </group>
-            
+
             <group>
               <title>Jakarta Commons Logging packages</title>
               <packages>org.apache.commons.*</packages>
             </group>
-            
+
             <group>
               <title>java.util.logging (JUL) to SLF4J bridge</title>
               <packages>org.slf4j.bridge</packages>
             </group>
-            
+
             <group>
-              <title>Apache log4j</title>
+              <title>log4j-over-slf4j redirection</title>
               <packages>org.apache.log4j:org.apache.log4j.*</packages>
             </group>
           </groups>
+
         </configuration>
       </plugin>
-      
+
+      <plugin>
+        <groupId>org.sonatype.central</groupId>
+        <artifactId>central-publishing-maven-plugin</artifactId>
+        <version>${central-publishing-maven-plugin.version}</version>
+        <extensions>true</extensions>
+        <configuration>
+          <publishingServerId>central</publishingServerId>
+          <excludeArtifacts>integration</excludeArtifacts>
+        </configuration>
+      </plugin>
+
     </plugins>
-  </reporting>
+  </build>
 
   <profiles>
-    <profile>
-      <id>skipTests</id>
-      <properties>
-        <maven.test.skip>true</maven.test.skip>
-      </properties>
-    </profile>
-
-    <profile>
-      <id>javadocjar</id>
-      <build>
-        <plugins>
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-javadoc-plugin</artifactId>
-            <version>${maven-javadoc-plugin.version}</version>
-            <executions>
-              <execution>
-                <id>attach-javadocs</id>
-                <goals>
-                  <goal>jar</goal>
-                </goals>
-              </execution>
-            </executions>
-            <configuration>
-              <additionalparam>-Xdoclint:none</additionalparam>
-              <failOnError>false</failOnError>
-              <sourceFileExcludes>
-                <sourceFileExclude>**/module-info.java</sourceFileExclude>
-              </sourceFileExcludes>
-            </configuration>
-          </plugin>
-        </plugins>
-      </build>
-    </profile>
-
-    <profile>
-      <id>license</id>
-      <build>
-        <plugins>
-          <plugin>
-            <groupId>com.google.code.maven-license-plugin</groupId>
-            <artifactId>maven-license-plugin</artifactId>
-            <configuration>
-              <header>src/main/licenseHeader.txt</header>
-              <quiet>false</quiet>
-              <failIfMissing>true</failIfMissing>
-              <aggregate>true</aggregate>
-              <includes>
-                <include>src/**/*.java</include>
-              </includes>
-              <useDefaultExcludes>true</useDefaultExcludes>
-              <useDefaultMapping>true</useDefaultMapping>
-              <properties>
-                <year>1999</year>
-              </properties>
-              <headerDefinitions>
-                <headerDefinition>src/main/javadocHeaders.xml</headerDefinition>
-              </headerDefinitions>
-            </configuration>
-          </plugin>
-        </plugins>
-      </build>
-
-      <pluginRepositories>
-      </pluginRepositories>
-    </profile>
 
     <profile>
       <id>sign-artifacts</id>
@@ -464,59 +261,6 @@
         </plugins>
       </build>
     </profile>
-
-    <!--
-    <profile>
-      <id>travis</id>
-      <activation>
-        <property>
-          <name>env.TRAVIS</name>
-          <value>true</value>
-        </property>
-      </activation>
-      <build>
-        <plugins>
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-toolchains-plugin</artifactId>
-            <version>1.1</version>
-            <executions>
-              <execution>
-                <id>toolchain</id>
-                <phase>none</phase>
-              </execution>
-            </executions>
-          </plugin>
-        </plugins>
-      </build>
-    </profile>
-    -->
   </profiles>
 
-  <pluginRepositories>
-    <pluginRepository>
-         <id>apache-snapshot-repo</id>
-         <name>apache-snapshot-repo</name>
-         <url>https://repository.apache.org/content/groups/snapshots/</url>
-         <releases>
-           <enabled>false</enabled>
-         </releases>
-         <snapshots>
-           <enabled>true</enabled>
-         </snapshots>
-
-    </pluginRepository>
-  </pluginRepositories>
-
-  <distributionManagement>
-
-    <repository>
-      <!--<id>pixie</id>-->
-      <!--<url>scp://pixie.qos.ch/var/mvnrepo/</url>-->
-      <id>sonatype-nexus-staging</id>
-      <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
-    </repository>
-
-  </distributionManagement>
-
 </project>

release.sh

@@ -4,6 +4,10 @@
 #JDK8 - mvn site:site
 #rscpSLF4J apidocs/ 
 
+# JDK 11+
+# adding the following 
+#mvn -Ddoclint=none -Dadditionalparam=-Xdoclint:none  javadoc:aggregate
+
 
 #mvn versions:set -DgenerateBackupPoms=false -DnewVersion=${VERSION_NUMBER} 
 
@@ -42,8 +46,9 @@ echoRunAndCheck "$MVN install"
 
 if [ ! -z "$PASS"  ]
 then
-  export GPG_TTY=$(tty)    
-  echoRunAndCheck "$MVN deploy -P javadocjar,sign-artifacts"
+    # WARNING deploying without cleaning may leave stale MANIFEST files    
+    export GPG_TTY=$(tty)
+    echoRunAndCheck "$MVN deploy -P javadocjar,sign-artifacts"
 fi
 
 

slf4j-api/LICENSE.txt

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2007 QOS.ch
+Copyright (c) 2004-2023 QOS.ch
 All rights reserved.
 
 Permission is hereby granted, free  of charge, to any person obtaining

slf4j-api/pom.xml

@@ -7,7 +7,8 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>slf4j-api</artifactId>
@@ -52,6 +53,27 @@
           </execution>
         </executions>
       </plugin>
+
+      <plugin>
+        <groupId>org.apache.felix</groupId>
+        <artifactId>maven-bundle-plugin</artifactId>
+        <configuration>
+          <instructions>
+            <Import-Package>org.slf4j.spi;version="${range;[===,+);${version_cleanup;${project.version}}}"</Import-Package>
+            <!-- Export the client/user package of slf4j-api version 1 to make the slf4j-api bundle in version 2 usable for bundles that only import slf4j-1.x -->
+            <_exportcontents><![CDATA[
+              *,\
+              org.slf4j;version="${latest.1.version}",\
+              org.slf4j.helpers;version="${latest.1.version}"
+            ]]></_exportcontents>
+            <Require-Capability><![CDATA[
+              osgi.extender;filter:="(&(osgi.extender=osgi.serviceloader.processor)(version>=1.0.0)(!(version>=2.0.0)))",
+              osgi.serviceloader;filter:="(osgi.serviceloader=org.slf4j.spi.SLF4JServiceProvider)";osgi.serviceloader="org.slf4j.spi.SLF4JServiceProvider"
+            ]]></Require-Capability>
+          </instructions>
+        </configuration>
+      </plugin>
+
     </plugins>
 
   </build>

slf4j-api/src/main/java/org/slf4j/Logger.java

@@ -37,6 +37,7 @@ import static org.slf4j.event.Level.TRACE;
 import static org.slf4j.event.Level.WARN;
 
 import org.slf4j.event.Level;
+import org.slf4j.helpers.CheckReturnValue;
 import org.slf4j.spi.DefaultLoggingEventBuilder;
 import org.slf4j.spi.LoggingEventBuilder;
 import org.slf4j.spi.NOPLoggingEventBuilder;
@@ -98,13 +99,16 @@ public interface Logger {
     /**
      * <p>Make a new {@link LoggingEventBuilder} instance as appropriate for this logger implementation.
      * This default implementation always returns a new instance of {@link DefaultLoggingEventBuilder}.</p>
-     *
-     * <p>Note that the {@link LoggingEventBuilder} should be built for all levels, independently of the level.
-     * In other words, this method is an <b>unconditional</b> constructor for the {@link LoggingEventBuilder}
-     * appropriate for this logger implementation.</p>
-     *
+     * <p></p>
+     * <p>This method is intended to be used by logging systems implementing the SLF4J API and <b>not</b>
+     * by end users.</p>
+     * <p></p>
+     * <p>Also note that a {@link LoggingEventBuilder} instance should be built for all levels,
+     * independently of the level argument. In other words, this method is an <b>unconditional</b>
+     * constructor for the {@link LoggingEventBuilder} appropriate for this logger implementation.</p>
+     * <p></p>
      * @param level desired level for the event builder
-     * @return a new {@link LoggingEventBuilder} instance as appropriate for this logger
+     * @return a new {@link LoggingEventBuilder} instance as appropriate for <b>this</b> logger
      * @since 2.0
      */
     default public LoggingEventBuilder makeLoggingEventBuilder(Level level) {
@@ -121,6 +125,7 @@ public interface Logger {
      * @return a new {@link LoggingEventBuilder} instance as appropriate for this logger
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atLevel(Level level) {
         if (isEnabledForLevel(level)) {
             return makeLoggingEventBuilder(level);
@@ -243,6 +248,7 @@ public interface Logger {
      * @return LoggingEventBuilder instance as appropriate for level TRACE
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atTrace() {
         if (isTraceEnabled()) {
             return makeLoggingEventBuilder(TRACE);
@@ -439,6 +445,7 @@ public interface Logger {
      * @return LoggingEventBuilder instance as appropriate for level DEBUG
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atDebug() {
         if (isDebugEnabled()) {
             return makeLoggingEventBuilder(DEBUG);
@@ -579,6 +586,7 @@ public interface Logger {
      * @return LoggingEventBuilder instance as appropriate for level INFO
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atInfo() {
         if (isInfoEnabled()) {
             return makeLoggingEventBuilder(INFO);
@@ -719,6 +727,7 @@ public interface Logger {
      * @return LoggingEventBuilder instance as appropriate for level WARN
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atWarn() {
         if (isWarnEnabled()) {
             return makeLoggingEventBuilder(WARN);
@@ -860,6 +869,7 @@ public interface Logger {
      * @return LoggingEventBuilder instance as appropriate for level ERROR
      * @since 2.0
      */
+    @CheckReturnValue
     default public LoggingEventBuilder atError() {
         if (isErrorEnabled()) {
             return makeLoggingEventBuilder(ERROR);

slf4j-api/src/main/java/org/slf4j/LoggerFactory.java

@@ -25,41 +25,47 @@
 package org.slf4j;
 
 import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
 import java.net.URL;
+import java.security.AccessController;
+import java.security.PrivilegedAction;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Enumeration;
+import java.util.Iterator;
 import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.ServiceConfigurationError;
 import java.util.ServiceLoader;
 import java.util.Set;
 import java.util.concurrent.LinkedBlockingQueue;
 
 import org.slf4j.event.SubstituteLoggingEvent;
 import org.slf4j.helpers.NOP_FallbackServiceProvider;
-import org.slf4j.helpers.SubstituteServiceProvider;
+import org.slf4j.helpers.Reporter;
 import org.slf4j.helpers.SubstituteLogger;
-
+import org.slf4j.helpers.SubstituteServiceProvider;
 import org.slf4j.helpers.Util;
+import org.slf4j.spi.MDCAdapter;
 import org.slf4j.spi.SLF4JServiceProvider;
 
 /**
  * The <code>LoggerFactory</code> is a utility class producing Loggers for
- * various logging APIs, most notably for log4j, logback and JDK 1.4 logging.
+ * various logging APIs, e.g. logback, reload4j, log4j and JDK 1.4 logging.
  * Other implementations such as {@link org.slf4j.helpers.NOPLogger NOPLogger} and
  * SimpleLogger are also supported.
- * 
- * <p><code>LoggerFactory</code> is essentially a wrapper around an
- * {@link ILoggerFactory} instance bound with <code>LoggerFactory</code> at
- * compile time.
- * 
+ *
+ * <p><code>LoggerFactory</code>  is essentially a wrapper around an
+ * {@link ILoggerFactory} instance provided by a {@link SLF4JServiceProvider}.
+ *
  * <p>
  * Please note that all methods in <code>LoggerFactory</code> are static.
- * 
+ *
  * @author Alexander Dorokhine
  * @author Robert Elliot
  * @author Ceki G&uuml;lc&uuml;
- * 
+ *
  */
 public final class LoggerFactory {
 
@@ -68,9 +74,7 @@ public final class LoggerFactory {
     static final String NO_PROVIDERS_URL = CODES_PREFIX + "#noProviders";
     static final String IGNORED_BINDINGS_URL = CODES_PREFIX + "#ignoredBindings";
 
-    static final String NO_STATICLOGGERBINDER_URL = CODES_PREFIX + "#StaticLoggerBinder";
     static final String MULTIPLE_BINDINGS_URL = CODES_PREFIX + "#multiple_bindings";
-    static final String NULL_LF_URL = CODES_PREFIX + "#null_LF";
     static final String VERSION_MISMATCH = CODES_PREFIX + "#version_mismatch";
     static final String SUBSTITUTE_LOGGER_URL = CODES_PREFIX + "#substituteLogger";
     static final String LOGGER_NAME_MISMATCH_URL = CODES_PREFIX + "#loggerNameMismatch";
@@ -80,6 +84,16 @@ public final class LoggerFactory {
     static final String UNSUCCESSFUL_INIT_MSG = "org.slf4j.LoggerFactory in failed state. Original exception was thrown EARLIER. See also "
                     + UNSUCCESSFUL_INIT_URL;
 
+    static final String CONNECTED_WITH_MSG = "Connected with provider of type [";
+
+    /**
+     * System property for explicitly setting the provider class. If set and the provider could be instantiated,
+     * then the service loading mechanism will be bypassed.
+     *
+     * @since 2.0.9
+     */
+    static final public String PROVIDER_PROPERTY_KEY = "slf4j.provider";
+
     static final int UNINITIALIZED = 0;
     static final int ONGOING_INITIALIZATION = 1;
     static final int FAILED_INITIALIZATION = 2;
@@ -98,21 +112,55 @@ public final class LoggerFactory {
 
     static volatile SLF4JServiceProvider PROVIDER;
 
-    private static List<SLF4JServiceProvider> findServiceProviders() {
-        ServiceLoader<SLF4JServiceProvider> serviceLoader = ServiceLoader.load(SLF4JServiceProvider.class);
+    // Package access for tests
+    static List<SLF4JServiceProvider> findServiceProviders() {
         List<SLF4JServiceProvider> providerList = new ArrayList<>();
-        for (SLF4JServiceProvider provider : serviceLoader) {
-            providerList.add(provider);
+
+        // retain behaviour similar to that of 1.7 series and earlier. More specifically, use the class loader that
+        // loaded the present class to search for services
+        final ClassLoader classLoaderOfLoggerFactory = LoggerFactory.class.getClassLoader();
+
+        SLF4JServiceProvider explicitProvider = loadExplicitlySpecified(classLoaderOfLoggerFactory);
+        if(explicitProvider != null) {
+            providerList.add(explicitProvider);
+            return providerList;
+        }
+
+
+         ServiceLoader<SLF4JServiceProvider> serviceLoader = getServiceLoader(classLoaderOfLoggerFactory);
+
+        Iterator<SLF4JServiceProvider> iterator = serviceLoader.iterator();
+        while (iterator.hasNext()) {
+            safelyInstantiate(providerList, iterator);
         }
         return providerList;
     }
 
+    private static ServiceLoader<SLF4JServiceProvider> getServiceLoader(final ClassLoader classLoaderOfLoggerFactory) {
+        ServiceLoader<SLF4JServiceProvider> serviceLoader;
+        SecurityManager securityManager = System.getSecurityManager();
+        if(securityManager == null) {
+            serviceLoader = ServiceLoader.load(SLF4JServiceProvider.class, classLoaderOfLoggerFactory);
+        } else {
+            final PrivilegedAction<ServiceLoader<SLF4JServiceProvider>> action = () -> ServiceLoader.load(SLF4JServiceProvider.class, classLoaderOfLoggerFactory);
+            serviceLoader = AccessController.doPrivileged(action);
+        }
+        return serviceLoader;
+    }
+
+    private static void safelyInstantiate(List<SLF4JServiceProvider> providerList, Iterator<SLF4JServiceProvider> iterator) {
+        try {
+            SLF4JServiceProvider provider = iterator.next();
+            providerList.add(provider);
+        } catch (ServiceConfigurationError e) {
+            Reporter.error("A service provider failed to instantiate:\n" + e.getMessage());
+        }
+    }
+
     /**
      * It is LoggerFactory's responsibility to track version changes and manage
      * the compatibility list.
      * <p>
-     * <p>
-     * It is assumed that all versions in the 1.6 are mutually compatible.
      */
     static private final String[] API_COMPATIBILITY_LIST = new String[] { "2.0" };
 
@@ -148,15 +196,16 @@ public final class LoggerFactory {
             reportMultipleBindingAmbiguity(providersList);
             if (providersList != null && !providersList.isEmpty()) {
                 PROVIDER = providersList.get(0);
+                earlyBindMDCAdapter();
                 // SLF4JServiceProvider.initialize() is intended to be called here and nowhere else.
                 PROVIDER.initialize();
                 INITIALIZATION_STATE = SUCCESSFUL_INITIALIZATION;
                 reportActualBinding(providersList);
             } else {
                 INITIALIZATION_STATE = NOP_FALLBACK_INITIALIZATION;
-                Util.report("No SLF4J providers were found.");
-                Util.report("Defaulting to no-operation (NOP) logger implementation");
-                Util.report("See " + NO_PROVIDERS_URL + " for further details.");
+                Reporter.warn("No SLF4J providers were found.");
+                Reporter.warn("Defaulting to no-operation (NOP) logger implementation");
+                Reporter.warn("See " + NO_PROVIDERS_URL + " for further details.");
 
                 Set<URL> staticLoggerBinderPathSet = findPossibleStaticLoggerBinderPathSet();
                 reportIgnoredStaticLoggerBinders(staticLoggerBinderPathSet);
@@ -168,16 +217,52 @@ public final class LoggerFactory {
         }
     }
 
+    /**
+     * The value of PROVIDER.getMDCAdapter() can be null while PROVIDER has not yet initialized.
+     *
+     * However, SLF4JServiceProvider implementations are expected to initialize their internal
+     * MDCAdapter field in their constructor or on field declaration.
+     */
+    private static void earlyBindMDCAdapter() {
+        MDCAdapter mdcAdapter = PROVIDER.getMDCAdapter();
+        if(mdcAdapter != null) {
+            MDC.setMDCAdapter(mdcAdapter);
+        }
+    }
+
+    static SLF4JServiceProvider loadExplicitlySpecified(ClassLoader classLoader) {
+        String explicitlySpecified = System.getProperty(PROVIDER_PROPERTY_KEY);
+        if (null == explicitlySpecified || explicitlySpecified.isEmpty()) {
+            return null;
+        }
+        try {
+            String message = String.format("Attempting to load provider \"%s\" specified via \"%s\" system property", explicitlySpecified, PROVIDER_PROPERTY_KEY);
+            Reporter.info(message);
+            Class<?> clazz = classLoader.loadClass(explicitlySpecified);
+            Constructor<?> constructor = clazz.getConstructor();
+            Object provider = constructor.newInstance();
+            return (SLF4JServiceProvider) provider;
+        } catch (ClassNotFoundException | NoSuchMethodException | InstantiationException | IllegalAccessException | InvocationTargetException e) {
+            String message = String.format("Failed to instantiate the specified SLF4JServiceProvider (%s)", explicitlySpecified);
+            Reporter.error(message, e);
+            return null;
+        } catch (ClassCastException e) {
+            String message = String.format("Specified SLF4JServiceProvider (%s) does not implement SLF4JServiceProvider interface", explicitlySpecified);
+            Reporter.error(message, e);
+            return null;
+        }
+    }
+
     private static void reportIgnoredStaticLoggerBinders(Set<URL> staticLoggerBinderPathSet) {
         if (staticLoggerBinderPathSet.isEmpty()) {
             return;
         }
-        Util.report("Class path contains SLF4J bindings targeting slf4j-api versions 1.7.x or earlier.");
+        Reporter.warn("Class path contains SLF4J bindings targeting slf4j-api versions 1.7.x or earlier.");
 
         for (URL path : staticLoggerBinderPathSet) {
-            Util.report("Ignoring binding found at [" + path + "]");
+            Reporter.warn("Ignoring binding found at [" + path + "]");
         }
-        Util.report("See " + IGNORED_BINDINGS_URL + " for an explanation.");
+        Reporter.warn("See " + IGNORED_BINDINGS_URL + " for an explanation.");
 
     }
 
@@ -203,7 +288,7 @@ public final class LoggerFactory {
                 staticLoggerBinderPathSet.add(path);
             }
         } catch (IOException ioe) {
-            Util.report("Error getting resources from path", ioe);
+            Reporter.error("Error getting resources from path", ioe);
         }
         return staticLoggerBinderPathSet;
     }
@@ -228,7 +313,7 @@ public final class LoggerFactory {
 
     static void failedBinding(Throwable t) {
         INITIALIZATION_STATE = FAILED_INITIALIZATION;
-        Util.report("Failed to instantiate SLF4J LoggerFactory", t);
+        Reporter.error("Failed to instantiate SLF4J LoggerFactory", t);
     }
 
     private static void replayEvents() {
@@ -273,24 +358,26 @@ public final class LoggerFactory {
         if (substLogger.isDelegateNOP()) {
             // nothing to do
         } else if (substLogger.isDelegateEventAware()) {
-            substLogger.log(event);
+            if(substLogger.isEnabledForLevel(event.getLevel())) {
+                substLogger.log(event);
+            }
         } else {
-            Util.report(loggerName);
+            Reporter.warn(loggerName);
         }
     }
 
     private static void emitSubstitutionWarning() {
-        Util.report("The following set of substitute loggers may have been accessed");
-        Util.report("during the initialization phase. Logging calls during this");
-        Util.report("phase were not honored. However, subsequent logging calls to these");
-        Util.report("loggers will work as normally expected.");
-        Util.report("See also " + SUBSTITUTE_LOGGER_URL);
+        Reporter.warn("The following set of substitute loggers may have been accessed");
+        Reporter.warn("during the initialization phase. Logging calls during this");
+        Reporter.warn("phase were not honored. However, subsequent logging calls to these");
+        Reporter.warn("loggers will work as normally expected.");
+        Reporter.warn("See also " + SUBSTITUTE_LOGGER_URL);
     }
 
     private static void emitReplayWarning(int eventCount) {
-        Util.report("A number (" + eventCount + ") of logging calls during the initialization phase have been intercepted and are");
-        Util.report("now being replayed. These are subject to the filtering rules of the underlying logging system.");
-        Util.report("See also " + REPLAY_URL);
+        Reporter.warn("A number (" + eventCount + ") of logging calls during the initialization phase have been intercepted and are");
+        Reporter.warn("now being replayed. These are subject to the filtering rules of the underlying logging system.");
+        Reporter.warn("See also " + REPLAY_URL);
     }
 
     private final static void versionSanityCheck() {
@@ -304,18 +391,13 @@ public final class LoggerFactory {
                 }
             }
             if (!match) {
-                Util.report("The requested version " + requested + " by your slf4j binding is not compatible with "
+                Reporter.warn("The requested version " + requested + " by your slf4j provider is not compatible with "
                                 + Arrays.asList(API_COMPATIBILITY_LIST).toString());
-                Util.report("See " + VERSION_MISMATCH + " for further details.");
+                Reporter.warn("See " + VERSION_MISMATCH + " for further details.");
             }
-        } catch (java.lang.NoSuchFieldError nsfe) {
-            // given our large user base and SLF4J's commitment to backward
-            // compatibility, we cannot cry here. Only for implementations
-            // which willingly declare a REQUESTED_API_VERSION field do we
-            // emit compatibility warnings.
         } catch (Throwable e) {
             // we should never reach here
-            Util.report("Unexpected problem occured during version sanity check", e);
+            Reporter.error("Unexpected problem occurred during version sanity check", e);
         }
     }
 
@@ -326,29 +408,36 @@ public final class LoggerFactory {
     /**
      * Prints a warning message on the console if multiple bindings were found
      * on the class path. No reporting is done otherwise.
-     * 
+     *
      */
     private static void reportMultipleBindingAmbiguity(List<SLF4JServiceProvider> providerList) {
         if (isAmbiguousProviderList(providerList)) {
-            Util.report("Class path contains multiple SLF4J providers.");
+            Reporter.warn("Class path contains multiple SLF4J providers.");
             for (SLF4JServiceProvider provider : providerList) {
-                Util.report("Found provider [" + provider + "]");
+                Reporter.warn("Found provider [" + provider + "]");
             }
-            Util.report("See " + MULTIPLE_BINDINGS_URL + " for an explanation.");
+            Reporter.warn("See " + MULTIPLE_BINDINGS_URL + " for an explanation.");
         }
     }
 
     private static void reportActualBinding(List<SLF4JServiceProvider> providerList) {
-        // binderPathSet can be null under Android
-        if (!providerList.isEmpty() && isAmbiguousProviderList(providerList)) {
-            Util.report("Actual provider is of type [" + providerList.get(0) + "]");
+        // impossible since a provider has been found
+        if (providerList.isEmpty()) {
+            throw new IllegalStateException("No providers were found which is impossible after successful initialization.");
+        }
+
+        if (isAmbiguousProviderList(providerList)) {
+            Reporter.info("Actual provider is of type [" + providerList.get(0) + "]");
+        } else {
+            SLF4JServiceProvider provider = providerList.get(0);
+            Reporter.debug(CONNECTED_WITH_MSG + provider.getClass().getName() + "]");
         }
     }
 
     /**
      * Return a logger named according to the name parameter using the
      * statically bound {@link ILoggerFactory} instance.
-     * 
+     *
      * @param name
      *            The name of the logger.
      * @return logger
@@ -361,7 +450,7 @@ public final class LoggerFactory {
     /**
      * Return a logger named corresponding to the class passed as parameter,
      * using the statically bound {@link ILoggerFactory} instance.
-     * 
+     *
      * <p>
      * In case the <code>clazz</code> parameter differs from the name of the
      * caller as computed internally by SLF4J, a logger name mismatch warning
@@ -369,12 +458,12 @@ public final class LoggerFactory {
      * <code>slf4j.detectLoggerNameMismatch</code> system property is set to
      * true. By default, this property is not set and no warnings will be
      * printed even in case of a logger name mismatch.
-     * 
+     *
      * @param clazz
      *            the returned logger will be named after clazz
      * @return logger
-     * 
-     * 
+     *
+     *
      * @see <a
      *      href="http://www.slf4j.org/codes.html#loggerNameMismatch">Detected
      *      logger name mismatch</a>
@@ -384,9 +473,9 @@ public final class LoggerFactory {
         if (DETECT_LOGGER_NAME_MISMATCH) {
             Class<?> autoComputedCallingClass = Util.getCallingClass();
             if (autoComputedCallingClass != null && nonMatchingClasses(clazz, autoComputedCallingClass)) {
-                Util.report(String.format("Detected logger name mismatch. Given name: \"%s\"; computed name: \"%s\".", logger.getName(),
+                Reporter.warn(String.format("Detected logger name mismatch. Given name: \"%s\"; computed name: \"%s\".", logger.getName(),
                                 autoComputedCallingClass.getName()));
-                Util.report("See " + LOGGER_NAME_MISMATCH_URL + " for an explanation");
+                Reporter.warn("See " + LOGGER_NAME_MISMATCH_URL + " for an explanation");
             }
         }
         return logger;
@@ -401,7 +490,7 @@ public final class LoggerFactory {
      * <p>
      * <p>
      * ILoggerFactory instance is bound with this class at compile time.
-     * 
+     *
      * @return the ILoggerFactory instance in use
      */
     public static ILoggerFactory getILoggerFactory() {
@@ -410,7 +499,7 @@ public final class LoggerFactory {
 
     /**
      * Return the {@link SLF4JServiceProvider} in use.
-    
+
      * @return provider in use
      * @since 1.8.0
      */

slf4j-api/src/main/java/org/slf4j/MDC.java

@@ -28,9 +28,7 @@ import java.io.Closeable;
 import java.util.Deque;
 import java.util.Map;
 
-import org.slf4j.helpers.BasicMDCAdapter;
-import org.slf4j.helpers.NOPMDCAdapter;
-import org.slf4j.helpers.Util;
+import org.slf4j.helpers.*;
 import org.slf4j.spi.MDCAdapter;
 import org.slf4j.spi.SLF4JServiceProvider;
 
@@ -65,9 +63,9 @@ import org.slf4j.spi.SLF4JServiceProvider;
 public class MDC {
 
     static final String NULL_MDCA_URL = "http://www.slf4j.org/codes.html#null_MDCA";
-    private static final String MDC_APAPTER_CANNOT_BE_NULL_MESSAGE = "MDCAdapter cannot be null. See also " + NULL_MDCA_URL;
+    private static final String MDC_ADAPTER_CANNOT_BE_NULL_MESSAGE = "MDCAdapter cannot be null. See also " + NULL_MDCA_URL;
     static final String NO_STATIC_MDC_BINDER_URL = "http://www.slf4j.org/codes.html#no_static_mdc_binder";
-    static MDCAdapter mdcAdapter;
+    static MDCAdapter MDC_ADAPTER;
 
     /**
      * An adapter to remove the key when done.
@@ -87,14 +85,30 @@ public class MDC {
     private MDC() {
     }
 
-    static {
+    private static MDCAdapter getMDCAdapterGivenByProvider() {
         SLF4JServiceProvider provider = LoggerFactory.getProvider();
-        if (provider != null) {
-            mdcAdapter = provider.getMDCAdapter();
+        if(provider != null) {
+            // If you wish to change the mdc adapter, setting the MDC.MDCAdapter variable might be insufficient.
+            // Keep in mind that the provider *might* perform additional internal mdcAdapter assignments that
+            // you would also need to replicate/adapt.
+
+            // obtain and attach the MDCAdapter from the provider
+
+            final MDCAdapter anAdapter = provider.getMDCAdapter();
+            emitTemporaryMDCAdapterWarningIfNeeded(provider);
+            return anAdapter;
         } else {
-            Util.report("Failed to find provider.");
-            Util.report("Defaulting to no-operation MDCAdapter implementation.");
-            mdcAdapter = new NOPMDCAdapter();
+            Reporter.error("Failed to find provider.");
+            Reporter.error("Defaulting to no-operation MDCAdapter implementation.");
+            return new NOPMDCAdapter();
+        }
+    }
+
+    private static void emitTemporaryMDCAdapterWarningIfNeeded(SLF4JServiceProvider provider) {
+        boolean isSubstitute = provider instanceof SubstituteServiceProvider;
+        if(isSubstitute) {
+            Reporter.info("Temporary mdcAdapter given by SubstituteServiceProvider.");
+            Reporter.info("This mdcAdapter will be replaced after backend initialization has completed.");
         }
     }
 
@@ -117,10 +131,10 @@ public class MDC {
         if (key == null) {
             throw new IllegalArgumentException("key parameter cannot be null");
         }
-        if (mdcAdapter == null) {
-            throw new IllegalStateException(MDC_APAPTER_CANNOT_BE_NULL_MESSAGE);
+        if (getMDCAdapter() == null) {
+            throw new IllegalStateException(MDC_ADAPTER_CANNOT_BE_NULL_MESSAGE);
         }
-        mdcAdapter.put(key, val);
+        getMDCAdapter().put(key, val);
     }
 
     /**
@@ -173,10 +187,8 @@ public class MDC {
             throw new IllegalArgumentException("key parameter cannot be null");
         }
 
-        if (mdcAdapter == null) {
-            throw new IllegalStateException(MDC_APAPTER_CANNOT_BE_NULL_MESSAGE);
-        }
-        return mdcAdapter.get(key);
+        mdcAdapterNullCheck();
+        return getMDCAdapter().get(key);
     }
 
     /**
@@ -194,20 +206,16 @@ public class MDC {
             throw new IllegalArgumentException("key parameter cannot be null");
         }
 
-        if (mdcAdapter == null) {
-            throw new IllegalStateException(MDC_APAPTER_CANNOT_BE_NULL_MESSAGE);
-        }
-        mdcAdapter.remove(key);
+        mdcAdapterNullCheck();
+        getMDCAdapter().remove(key);
     }
 
     /**
      * Clear all entries in the MDC of the underlying implementation.
      */
     public static void clear() {
-        if (mdcAdapter == null) {
-            throw new IllegalStateException(MDC_APAPTER_CANNOT_BE_NULL_MESSAGE);
-        }
-        mdcAdapter.clear();
+        mdcAdapterNullCheck();
+        getMDCAdapter().clear();
     }
 
     /**
@@ -218,10 +226,8 @@ public class MDC {
      * @since 1.5.1
      */
     public static Map<String, String> getCopyOfContextMap() {
-        if (mdcAdapter == null) {
-            throw new IllegalStateException(MDC_APAPTER_CANNOT_BE_NULL_MESSAGE);
-        }
-        return mdcAdapter.getCopyOfContextMap();
+        mdcAdapterNullCheck();
+        return getMDCAdapter().getCopyOfContextMap();
     }
 
     /**
@@ -236,23 +242,38 @@ public class MDC {
      * @since 1.5.1
      */
     public static void setContextMap(Map<String, String> contextMap) {
-        if (mdcAdapter == null) {
-            throw new IllegalStateException(MDC_APAPTER_CANNOT_BE_NULL_MESSAGE);
-        }
-        mdcAdapter.setContextMap(contextMap);
+        mdcAdapterNullCheck();
+        getMDCAdapter().setContextMap(contextMap);
     }
 
     /**
      * Returns the MDCAdapter instance currently in use.
-     * 
+     *
+     * Since 2.0.17, if the MDCAdapter instance is null, then this method set it to use
+     * the adapter returned by the SLF4JProvider. However, in the vast majority of cases
+     * the MDCAdapter will be set earlier (during initialization) by {@link LoggerFactory}.
+     *
      * @return the MDcAdapter instance currently in use.
      * @since 1.4.2
      */
     public static MDCAdapter getMDCAdapter() {
-        return mdcAdapter;
+        if(MDC_ADAPTER == null) {
+            MDC_ADAPTER = getMDCAdapterGivenByProvider();
+        }
+        return MDC_ADAPTER;
     }
 
-
+    /**
+     * Set MDCAdapter instance to use.
+     *
+     * @since 2.0.17
+     */
+    static void setMDCAdapter(MDCAdapter anMDCAdapter) {
+        if(anMDCAdapter == null) {
+            throw new IllegalStateException(MDC_ADAPTER_CANNOT_BE_NULL_MESSAGE);
+        }
+        MDC_ADAPTER = anMDCAdapter;
+    }
 
     /**
      * Push a value into the deque(stack) referenced by 'key'.
@@ -262,28 +283,24 @@ public class MDC {
      * @since 2.0.0
      */
     static public void pushByKey(String key, String value) {
-        if (mdcAdapter == null) {
-            throw new IllegalStateException(MDC_APAPTER_CANNOT_BE_NULL_MESSAGE);
-        }
-        mdcAdapter.pushByKey(key, value);
+        mdcAdapterNullCheck();
+        getMDCAdapter().pushByKey(key, value);
     }
     
     /**
-     * Pop the stack referenced by 'key' and return the value possibly null.
+     * Pop the <b>stack</b> referenced by 'key' and return the value possibly null.
      * 
      * @param key identifies the deque(stack)
      * @return the value just popped. May be null/
      * @since 2.0.0
      */
     static public String popByKey(String key) {
-        if (mdcAdapter == null) {
-            throw new IllegalStateException(MDC_APAPTER_CANNOT_BE_NULL_MESSAGE);
-        }
-        return mdcAdapter.popByKey(key);
+        mdcAdapterNullCheck();
+        return getMDCAdapter().popByKey(key);
     }
 
     /**
-     * Returns a copy of the deque(stack) referenced by 'key'. May be null.
+     * Returns a copy of the <b>deque(stack)</b> referenced by 'key'. May be null.
      * 
      * @param key identifies the  stack
      * @return copy of stack referenced by 'key'. May be null.
@@ -291,9 +308,13 @@ public class MDC {
      * @since 2.0.0
      */
     public Deque<String>  getCopyOfDequeByKey(String key) {
-        if (mdcAdapter == null) {
-            throw new IllegalStateException(MDC_APAPTER_CANNOT_BE_NULL_MESSAGE);
+        mdcAdapterNullCheck();
+        return getMDCAdapter().getCopyOfDequeByKey(key);
+    }
+
+    private static void mdcAdapterNullCheck() {
+        if (getMDCAdapter() == null) {
+            throw new IllegalStateException(MDC_ADAPTER_CANNOT_BE_NULL_MESSAGE);
         }
-        return mdcAdapter.getCopyOfDequeByKey(key);
     }
 }

slf4j-api/src/main/java/org/slf4j/MarkerFactory.java

@@ -25,6 +25,7 @@
 package org.slf4j;
 
 import org.slf4j.helpers.BasicMarkerFactory;
+import org.slf4j.helpers.Reporter;
 import org.slf4j.helpers.Util;
 import org.slf4j.spi.SLF4JServiceProvider;
 
@@ -53,8 +54,8 @@ public class MarkerFactory {
         if (provider != null) {
             MARKER_FACTORY = provider.getMarkerFactory();
         } else {
-            Util.report("Failed to find provider");
-            Util.report("Defaulting to BasicMarkerFactory.");
+            Reporter.error("Failed to find provider");
+            Reporter.error("Defaulting to BasicMarkerFactory.");
             MARKER_FACTORY = new BasicMarkerFactory();
         }
     }

slf4j-api/src/main/java/org/slf4j/event/KeyValuePair.java

@@ -1,5 +1,7 @@
 package org.slf4j.event;
 
+import java.util.Objects;
+
 public class KeyValuePair {
 
     public final String key;
@@ -14,4 +16,17 @@ public class KeyValuePair {
     public String toString() {
         return String.valueOf(key) + "=\"" + String.valueOf(value) +"\"";
     }
+
+    @Override
+    public boolean equals(Object o) {
+        if(this == o) return true;
+        if(o == null || getClass() != o.getClass()) return false;
+        KeyValuePair that = (KeyValuePair) o;
+        return Objects.equals(key, that.key) && Objects.equals(value, that.value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(key, value);
+    }
 }

slf4j-api/src/main/java/org/slf4j/event/LoggingEvent.java

@@ -23,6 +23,10 @@ public interface LoggingEvent {
 
     Object[] getArgumentArray();
 
+    /**
+     * List of markers in the event, might be null.
+     * @return markers in the event, might be null.
+     */
     List<Marker> getMarkers();
 
     List<KeyValuePair> getKeyValuePairs();

slf4j-api/src/main/java/org/slf4j/helpers/MessageFormatter.java

@@ -291,7 +291,7 @@ final public class MessageFormatter {
             String oAsString = o.toString();
             sbuf.append(oAsString);
         } catch (Throwable t) {
-            Util.report("SLF4J: Failed toString() invocation on an object of type [" + o.getClass().getName() + "]", t);
+            Reporter.error("Failed toString() invocation on an object of type [" + o.getClass().getName() + "]", t);
             sbuf.append("[FAILED toString()]");
         }
 

slf4j-api/src/main/java/org/slf4j/helpers/Reporter.java

@@ -0,0 +1,204 @@
+package org.slf4j.helpers;
+
+import java.io.PrintStream;
+
+/**
+ * An internally used class for reporting internal messages generated by SLF4J itself, typically
+ * during initialization.
+ *
+ * <p>
+ * Internal reporting is performed by calling the {@link #debug(String)}, {@link #info(String)},
+ * {@link #warn(String)} (String)} {@link #error(String)} (String)}  and
+ * {@link  #error(String, Throwable)} methods.
+ * </p>
+ * <p>See {@link #SLF4J_INTERNAL_VERBOSITY_KEY} and {@link #SLF4J_INTERNAL_REPORT_STREAM_KEY} for
+ * configuration options.</p>
+ * <p>
+ * <p>
+ * Note that this system is independent of the logging back-end in use.
+ *
+ * @since 2.0.10
+ */
+public class Reporter {
+
+    /**
+     * this class is used internally by Reporter
+     */
+    private enum Level {
+        DEBUG(0), INFO(1), WARN(2), ERROR(3);
+
+        int levelInt;
+
+        private Level(int levelInt) {
+            this.levelInt = levelInt;
+        }
+
+        private int getLevelInt() {
+            return levelInt;
+        }
+    }
+
+    private enum TargetChoice {
+        Stderr, Stdout;
+    }
+
+    static final String SLF4J_DEBUG_PREFIX = "SLF4J(D): ";
+    static final String SLF4J_INFO_PREFIX = "SLF4J(I): ";
+    static final String SLF4J_WARN_PREFIX = "SLF4J(W): ";
+    static final String SLF4J_ERROR_PREFIX = "SLF4J(E): ";
+
+
+    /**
+     * This system property controls the target for internal reports output by SLF4J.
+     * Recognized values for this key are "System.out", "stdout", "sysout", "System.err",
+     * "stderr" and "syserr".
+     *
+     * <p>By default, output is directed to "stderr".</p>
+     */
+    public static final String SLF4J_INTERNAL_REPORT_STREAM_KEY = "slf4j.internal.report.stream";
+    static private final String[] SYSOUT_KEYS = {"System.out", "stdout", "sysout"};
+
+    /**
+     * This system property controls the internal level of chattiness
+     * of SLF4J. Recognized settings are "INFO", "WARN" and "ERROR". The default value is "INFO".
+     */
+    public static final String SLF4J_INTERNAL_VERBOSITY_KEY = "slf4j.internal.verbosity";
+
+
+    static private final TargetChoice TARGET_CHOICE = getTargetChoice();
+
+    static private final Level INTERNAL_VERBOSITY = initVerbosity();
+
+    static private TargetChoice getTargetChoice() {
+        String reportStreamStr = System.getProperty(SLF4J_INTERNAL_REPORT_STREAM_KEY);
+
+        if(reportStreamStr == null || reportStreamStr.isEmpty()) {
+            return TargetChoice.Stderr;
+        }
+
+        for(String s : SYSOUT_KEYS) {
+            if(s.equalsIgnoreCase(reportStreamStr))
+                return TargetChoice.Stdout;
+        }
+        return TargetChoice.Stderr;
+    }
+
+
+    static private Level initVerbosity() {
+        String verbosityStr = System.getProperty(SLF4J_INTERNAL_VERBOSITY_KEY);
+
+        if(verbosityStr == null || verbosityStr.isEmpty()) {
+            return Level.INFO;
+        }
+
+        if(verbosityStr.equalsIgnoreCase("DEBUG")) {
+            return Level.DEBUG;
+        }
+
+        if(verbosityStr.equalsIgnoreCase("ERROR")) {
+            return Level.ERROR;
+        }
+
+
+        if(verbosityStr.equalsIgnoreCase("WARN")) {
+            return Level.WARN;
+        }
+
+        // anything else including verbosityStr.equalsIgnoreCase("INFO")
+        return Level.INFO;
+    }
+
+    static boolean isEnabledFor(Level level) {
+        return (level.levelInt >= INTERNAL_VERBOSITY.levelInt);
+    }
+
+    static private PrintStream getTarget() {
+        switch(TARGET_CHOICE) {
+            case Stdout:
+                return System.out;
+            case Stderr:
+            default:
+                return System.err;
+        }
+    }
+
+    /**
+     * Report an internal message of level DEBUG. Message text is prefixed with the string "SLF4J(D)",
+     * with (D) standing as a shorthand for DEBUG.
+     *
+     * <p>Messages of level DEBUG are be enabled when the {@link #SLF4J_INTERNAL_VERBOSITY_KEY}
+     * system property is set to "DEBUG" and disabled when set to "INFO", "WARN" or "ERROR". By default,
+     * {@link #SLF4J_INTERNAL_VERBOSITY_KEY} is set to "INFO".</p>
+     *
+     * @param msg the message text
+     * @since 2.0.16
+     */
+    public static void debug(String msg) {
+        if(isEnabledFor(Level.DEBUG)) {
+            getTarget().println(SLF4J_DEBUG_PREFIX + msg);
+        }
+    }
+
+    /**
+     * Report an internal message of level INFO. Message text is prefixed with the string "SLF4J(I)", with
+     * (I) standing as a shorthand for INFO.
+     *
+     * <p>Messages of level INFO are be enabled when the {@link #SLF4J_INTERNAL_VERBOSITY_KEY} system property is
+     * set to "DEBUG" or "INFO" and disabled when set to "WARN" or "ERROR". By default,
+     * {@link #SLF4J_INTERNAL_VERBOSITY_KEY} is set to "INFO".</p>
+     *
+     * @param msg the message text
+     */
+    public static void info(String msg) {
+        if(isEnabledFor(Level.INFO)) {
+            getTarget().println(SLF4J_INFO_PREFIX + msg);
+        }
+    }
+
+
+    /**
+     * Report an internal message of level "WARN". Message text is prefixed with the string "SLF4J(W)", with
+     * (W) standing as a shorthand for  WARN.
+     *
+     * <p>Messages of level WARN are be enabled when the {@link #SLF4J_INTERNAL_VERBOSITY_KEY} system property is
+     * set to "DEBUG", "INFO" or "WARN" and disabled when set to "ERROR". By default,
+     * {@link #SLF4J_INTERNAL_VERBOSITY_KEY} is set to "INFO".</p>
+     *
+     * @param msg the message text
+     */
+    static final public void warn(String msg) {
+        if(isEnabledFor(Level.WARN)) {
+            getTarget().println(SLF4J_WARN_PREFIX + msg);
+        }
+    }
+
+    /**
+     * Report an internal message of level "ERROR  accompanied by a {@link Throwable}.
+     * Message text is prefixed with the string "SLF4J(E)", with (E) standing as a shorthand for ERROR.
+     *
+     * <p>Messages of level ERROR are always enabled.
+     *
+     * @param msg the message text
+     * @param t a Throwable
+     */
+    static final public void error(String msg, Throwable t) {
+        // error cannot be disabled
+        getTarget().println(SLF4J_ERROR_PREFIX + msg);
+        getTarget().println(SLF4J_ERROR_PREFIX + "Reported exception:");
+        t.printStackTrace(getTarget());
+    }
+
+    /**
+     * Report an internal message of level "ERROR". Message text is prefixed with the string "SLF4J(E)",
+     * with (E)  standing as a shorthand for ERROR.
+     *
+     * <p>Messages of level ERROR are always enabled.
+     *
+     * @param msg the message text
+     */
+
+    static final public void error(String msg) {
+        // error cannot be disabled
+        getTarget().println(SLF4J_ERROR_PREFIX + msg);
+    }
+}

slf4j-api/src/main/java/org/slf4j/helpers/Slf4jEnvUtil.java

@@ -0,0 +1,73 @@
+/*
+ *  Copyright (c) 2004-2024 QOS.ch
+ *  All rights reserved.
+ *
+ *  Permission is hereby granted, free  of charge, to any person obtaining
+ *  a  copy  of this  software  and  associated  documentation files  (the
+ *  "Software"), to  deal in  the Software without  restriction, including
+ *  without limitation  the rights to  use, copy, modify,  merge, publish,
+ *  distribute,  sublicense, and/or sell  copies of  the Software,  and to
+ *  permit persons to whom the Software  is furnished to do so, subject to
+ *  the following conditions:
+ *
+ *  The  above  copyright  notice  and  this permission  notice  shall  be
+ *  included in all copies or substantial portions of the Software.
+ *
+ *  THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
+ *  EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
+ *  MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
+ *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ *  OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
+ *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package org.slf4j.helpers;
+
+/**
+ * Various utility methods
+ *
+ * @since 2.0.14
+ */
+public class Slf4jEnvUtil {
+
+
+    /**
+     * Returns the current version of slf4j, or null if data is not available.
+     *
+     * @return current version or null if missing version data
+     * @since 2.0.14
+     */
+    static public String slf4jVersion() {
+//        String moduleVersion = slf4jVersionByModule();
+//        if(moduleVersion != null)
+//            return moduleVersion;
+
+        Package pkg = Slf4jEnvUtil.class.getPackage();
+        if(pkg == null) {
+            return null;
+        }
+        final String pkgVersion = pkg.getImplementationVersion();
+        return pkgVersion;
+    }
+
+    /**
+     * Returns the current version of slf4j via class.getModule()
+     * or null if data is not available.
+     *
+     * @return current version or null if missing version data
+     * @since 2.0.14
+     */
+//    static private String slf4jVersionByModule() {
+//        Module module = Slf4jEnvUtil.class.getModule();
+//        if (module == null)
+//            return null;
+//
+//        ModuleDescriptor md = module.getDescriptor();
+//        if (md == null)
+//            return null;
+//        Optional<String> opt = md.rawVersion();
+//        return opt.orElse(null);
+//    }
+
+}

slf4j-api/src/main/java/org/slf4j/helpers/SubstituteServiceProvider.java

@@ -7,8 +7,18 @@ import org.slf4j.spi.SLF4JServiceProvider;
 
 public class SubstituteServiceProvider implements SLF4JServiceProvider {
     private final SubstituteLoggerFactory loggerFactory = new SubstituteLoggerFactory();
-    private final IMarkerFactory markerFactory = new BasicMarkerFactory();
-    private final MDCAdapter mdcAdapter = new BasicMDCAdapter();
+
+    // LoggerFactory expects providers to initialize markerFactory as early as possible.
+    private final IMarkerFactory markerFactory;
+
+    // LoggerFactory expects providers to initialize their MDCAdapter field
+    // as early as possible, preferably at construction time.
+    private final MDCAdapter mdcAdapter;
+
+    public SubstituteServiceProvider() {
+        markerFactory = new BasicMarkerFactory();
+        mdcAdapter = new BasicMDCAdapter();
+    }
 
     @Override
     public ILoggerFactory getLoggerFactory() {
@@ -36,6 +46,5 @@ public class SubstituteServiceProvider implements SLF4JServiceProvider {
 
     @Override
     public void initialize() {
-
     }
 }

slf4j-api/src/main/java/org/slf4j/helpers/Util.java

@@ -117,12 +117,26 @@ public final class Util {
         return trace[i + 2];
     }
 
+    /**
+     * See  {@link Reporter#error(String, Throwable)} class for alternative.
+     *
+     * @deprecated replaced by the {@link Reporter#error(String, Throwable)} method.
+     * @param msg message to print
+     * @param t throwable to print
+     */
     static final public void report(String msg, Throwable t) {
         System.err.println(msg);
         System.err.println("Reported exception:");
         t.printStackTrace();
     }
 
+    /**
+     * See  {@link Reporter} class for alternatives.
+     *
+     * @deprecated replaced by one of {@link Reporter#info(String)},
+     * {@link Reporter#warn(String)} or {@link Reporter#error(String)} methods.
+     * @param msg message to print
+     */
     static final public void report(String msg) {
         System.err.println("SLF4J: " + msg);
     }

slf4j-api/src/main/java/org/slf4j/spi/DefaultLoggingEventBuilder.java

@@ -1,7 +1,7 @@
 /**
  * Copyright (c) 2004-2022 QOS.ch
  * All rights reserved.
- *
+ * <p>
  * Permission is hereby granted, free  of charge, to any person obtaining
  * a  copy  of this  software  and  associated  documentation files  (the
  * "Software"), to  deal in  the Software without  restriction, including
@@ -9,10 +9,10 @@
  * distribute,  sublicense, and/or sell  copies of  the Software,  and to
  * permit persons to whom the Software  is furnished to do so, subject to
  * the following conditions:
- *
+ * <p>
  * The  above  copyright  notice  and  this permission  notice  shall  be
  * included in all copies or substantial portions of the Software.
- *
+ * <p>
  * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
  * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
  * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
@@ -20,10 +20,10 @@
  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
  */
 package org.slf4j.spi;
 
+import java.util.List;
 import java.util.function.Supplier;
 
 import org.slf4j.Logger;
@@ -38,11 +38,11 @@ import org.slf4j.event.LoggingEvent;
  */
 public class DefaultLoggingEventBuilder implements LoggingEventBuilder, CallerBoundaryAware {
 
-    
+
     // The caller boundary when the log() methods are invoked, is this class itself.
-    
+
     static String DLEB_FQCN = DefaultLoggingEventBuilder.class.getName();
-    
+
     protected DefaultLoggingEvent loggingEvent;
     protected Logger logger;
 
@@ -53,7 +53,7 @@ public class DefaultLoggingEventBuilder implements LoggingEventBuilder, CallerBo
 
     /**
      * Add a marker to the current logging event being built.
-     * 
+     * <p>
      * It is possible to add multiple markers to the same logging event.
      *
      * @param marker the marker to add
@@ -72,165 +72,16 @@ public class DefaultLoggingEventBuilder implements LoggingEventBuilder, CallerBo
 
     @Override
     public LoggingEventBuilder addArgument(Object p) {
-        loggingEvent.addArgument(p);
+        this.loggingEvent.addArgument(p);
         return this;
     }
 
     @Override
     public LoggingEventBuilder addArgument(Supplier<?> objectSupplier) {
-        loggingEvent.addArgument(objectSupplier.get());
+        this.loggingEvent.addArgument(objectSupplier.get());
         return this;
     }
 
-    @Override
-    public void setCallerBoundary(String fqcn) {
-        loggingEvent.setCallerBoundary(fqcn);
-    }
-
-    @Override
-    public void log() {
-        log(loggingEvent);
-    }
-
-    @Override
-    public LoggingEventBuilder setMessage(String message) {
-        loggingEvent.setMessage(message);
-        return this;
-    }
-    @Override
-    public LoggingEventBuilder setMessage(Supplier<String> messageSupplier) {
-        loggingEvent.setMessage(messageSupplier.get());
-        return this;
-    }
-
-    @Override
-    public void log(String message) {
-        loggingEvent.setMessage(message);
-        log(loggingEvent);
-    }
-
-    @Override
-    public void log(String message, Object arg) {
-        loggingEvent.setMessage(message);
-        loggingEvent.addArgument(arg);
-        log(loggingEvent);
-    }
-
-    @Override
-    public void log(String message, Object arg0, Object arg1) {
-        loggingEvent.setMessage(message);
-        loggingEvent.addArgument(arg0);
-        loggingEvent.addArgument(arg1);
-        log(loggingEvent);
-    }
-
-    @Override
-    public void log(String message, Object... args) {
-        loggingEvent.setMessage(message);
-        loggingEvent.addArguments(args);
-
-        log(loggingEvent);
-    }
-
-    @Override
-    public void log(Supplier<String> messageSupplier) {
-        if (messageSupplier == null) {
-            log((String) null);
-        } else {
-            log(messageSupplier.get());
-        }
-    }
-    
-    protected void log(LoggingEvent aLoggingEvent) {
-        setCallerBoundary(DLEB_FQCN);
-        if (logger instanceof LoggingEventAware) {
-            ((LoggingEventAware) logger).log(aLoggingEvent);
-        } else {
-            logViaPublicSLF4JLoggerAPI(aLoggingEvent);
-        }
-    }
-
-    private void logViaPublicSLF4JLoggerAPI(LoggingEvent aLoggingEvent) {
-        Object[] argArray = aLoggingEvent.getArgumentArray();
-        int argLen = argArray == null ? 0 : argArray.length;
-
-        Throwable t = aLoggingEvent.getThrowable();
-        int tLen = t == null ? 0 : 1;
-
-        String msg = aLoggingEvent.getMessage();
-
-        Object[] combinedArguments = new Object[argLen + tLen];
-
-        if (argArray != null) {
-            System.arraycopy(argArray, 0, combinedArguments, 0, argLen);
-        }
-        if (t != null) {
-            combinedArguments[argLen] = t;
-        }
-
-        msg = mergeMarkersAndKeyValuePairs(aLoggingEvent, msg);
-
-        switch (aLoggingEvent.getLevel()) {
-        case TRACE:
-            logger.trace(msg, combinedArguments);
-            break;
-        case DEBUG:
-            logger.debug(msg, combinedArguments);
-            break;
-        case INFO:
-            logger.info(msg, combinedArguments);
-            break;
-        case WARN:
-            logger.warn(msg, combinedArguments);
-            break;
-        case ERROR:
-            logger.error(msg, combinedArguments);
-            break;
-        }
-
-    }
-
-    /**
-     * Prepend markers and key-value pairs to the message.
-     * 
-     * @param aLoggingEvent
-     * @param msg
-     * @return
-     */
-    private String mergeMarkersAndKeyValuePairs(LoggingEvent aLoggingEvent, String msg) {
-
-        StringBuilder sb = null;
-
-        if (aLoggingEvent.getMarkers() != null) {
-            sb = new StringBuilder();
-            for (Marker marker : aLoggingEvent.getMarkers()) {
-                sb.append(marker);
-                sb.append(' ');
-            }
-        }
-
-        if (aLoggingEvent.getKeyValuePairs() != null) {
-            if (sb == null) {
-                sb = new StringBuilder();
-            }
-            for (KeyValuePair kvp : aLoggingEvent.getKeyValuePairs()) {
-                sb.append(kvp.key);
-                sb.append('=');
-                sb.append(kvp.value);
-                sb.append(' ');
-            }
-        }
-
-        if (sb != null) {
-            sb.append(msg);
-            return sb.toString();
-        } else {
-            return msg;
-        }
-    }
-
-
-
     @Override
     public LoggingEventBuilder addKeyValue(String key, Object value) {
         loggingEvent.addKeyValue(key, value);
@@ -243,4 +94,184 @@ public class DefaultLoggingEventBuilder implements LoggingEventBuilder, CallerBo
         return this;
     }
 
+    @Override
+    public void setCallerBoundary(String fqcn) {
+        this.loggingEvent.setCallerBoundary(fqcn);
+    }
+
+    @Override
+    public void log() {
+        log(this.loggingEvent);
+    }
+
+    @Override
+    public LoggingEventBuilder setMessage(String message) {
+        this.loggingEvent.setMessage(message);
+        return this;
+    }
+
+    @Override
+    public LoggingEventBuilder setMessage(Supplier<String> messageSupplier) {
+        this.loggingEvent.setMessage(messageSupplier.get());
+        return this;
+    }
+
+    @Override
+    public void log(String message) {
+        this.loggingEvent.setMessage(message);
+        log(this.loggingEvent);
+    }
+
+    @Override
+    public void log(String message, Object arg) {
+        this.loggingEvent.setMessage(message);
+        this.loggingEvent.addArgument(arg);
+        log(this.loggingEvent);
+    }
+
+    @Override
+    public void log(String message, Object arg0, Object arg1) {
+        this.loggingEvent.setMessage(message);
+        this.loggingEvent.addArgument(arg0);
+        this.loggingEvent.addArgument(arg1);
+        log(this.loggingEvent);
+    }
+
+    @Override
+    public void log(String message, Object... args) {
+        this.loggingEvent.setMessage(message);
+        this.loggingEvent.addArguments(args);
+
+        log(this.loggingEvent);
+    }
+
+    @Override
+    public void log(Supplier<String> messageSupplier) {
+        if(messageSupplier == null) {
+            log((String) null);
+        } else {
+            log(messageSupplier.get());
+        }
+    }
+
+    protected void log(LoggingEvent aLoggingEvent) {
+        if(aLoggingEvent.getCallerBoundary() == null) {
+            setCallerBoundary(DLEB_FQCN);
+        }
+
+        if(logger instanceof LoggingEventAware) {
+            ((LoggingEventAware) logger).log(aLoggingEvent);
+        } else if(logger instanceof LocationAwareLogger) {
+            logViaLocationAwareLoggerAPI((LocationAwareLogger) logger, aLoggingEvent);
+        } else {
+            logViaPublicSLF4JLoggerAPI(aLoggingEvent);
+        }
+    }
+
+    private void logViaLocationAwareLoggerAPI(LocationAwareLogger locationAwareLogger, LoggingEvent aLoggingEvent) {
+        List<Marker> markerList = aLoggingEvent.getMarkers();
+        Marker firstMarker = (markerList != null && !markerList.isEmpty()) ? markerList.get(0) : null;
+        String mergedMessage = mergeMarkersAndKeyValuePairsAndMessage(aLoggingEvent);
+        locationAwareLogger.log(firstMarker, aLoggingEvent.getCallerBoundary(), aLoggingEvent.getLevel().toInt(),
+                                mergedMessage,
+                                aLoggingEvent.getArgumentArray(), aLoggingEvent.getThrowable());
+    }
+
+    private void logViaPublicSLF4JLoggerAPI(LoggingEvent aLoggingEvent) {
+        Object[] argArray = aLoggingEvent.getArgumentArray();
+        int argLen = argArray == null ? 0 : argArray.length;
+
+        Throwable t = aLoggingEvent.getThrowable();
+        int tLen = t == null ? 0 : 1;
+
+        Object[] combinedArguments = new Object[argLen + tLen];
+
+        if(argArray != null) {
+            System.arraycopy(argArray, 0, combinedArguments, 0, argLen);
+        }
+        if(t != null) {
+            combinedArguments[argLen] = t;
+        }
+
+        String mergedMessage = mergeMarkersAndKeyValuePairsAndMessage(aLoggingEvent);
+
+
+        switch(aLoggingEvent.getLevel()) {
+            case TRACE:
+                logger.trace(mergedMessage, combinedArguments);
+                break;
+            case DEBUG:
+                logger.debug(mergedMessage, combinedArguments);
+                break;
+            case INFO:
+                logger.info(mergedMessage, combinedArguments);
+                break;
+            case WARN:
+                logger.warn(mergedMessage, combinedArguments);
+                break;
+            case ERROR:
+                logger.error(mergedMessage, combinedArguments);
+                break;
+        }
+    }
+
+
+    /**
+     * Prepend markers and key-value pairs to the message.
+     *
+     * @param aLoggingEvent
+     *
+     * @return
+     */
+    private String mergeMarkersAndKeyValuePairsAndMessage(LoggingEvent aLoggingEvent) {
+        StringBuilder sb = mergeMarkers(aLoggingEvent.getMarkers(), null);
+        sb = mergeKeyValuePairs(aLoggingEvent.getKeyValuePairs(), sb);
+        final String mergedMessage = mergeMessage(aLoggingEvent.getMessage(), sb);
+        return mergedMessage;
+    }
+
+    private StringBuilder mergeMarkers(List<Marker> markerList, StringBuilder sb) {
+        if(markerList == null || markerList.isEmpty())
+            return sb;
+
+        if(sb == null)
+            sb = new StringBuilder();
+
+        for(Marker marker : markerList) {
+            sb.append(marker);
+            sb.append(' ');
+        }
+        return sb;
+    }
+
+    private StringBuilder mergeKeyValuePairs(List<KeyValuePair> keyValuePairList, StringBuilder sb) {
+        if(keyValuePairList == null || keyValuePairList.isEmpty())
+            return sb;
+
+        if(sb == null)
+            sb = new StringBuilder();
+
+        for(KeyValuePair kvp : keyValuePairList) {
+            sb.append(kvp.key);
+            sb.append('=');
+            sb.append(kvp.value);
+            sb.append(' ');
+        }
+        return sb;
+    }
+
+    private String mergeMessage(String msg, StringBuilder sb) {
+        if(sb != null) {
+            sb.append(msg);
+            return sb.toString();
+        } else {
+            return msg;
+        }
+    }
+
+
+
+
+
+
 }

slf4j-api/src/main/java/org/slf4j/spi/LoggingEventAware.java

@@ -4,7 +4,17 @@ import org.slf4j.event.LoggingEvent;
 
 /**
  * A logger capable of logging from org.slf4j.event.LoggingEvent implements this interface.
- * 
+ *
+ * <p>Please note that when the {@link #log(LoggingEvent)} method assumes that
+ * the event was filtered beforehand and no further filtering needs to occur by the method itself.
+ * <p>
+ *
+ * <p>Implementations of this interface <b>may</b> apply further filtering but they are not
+ * required to do so. In other words, {@link #log(LoggingEvent)} method is free to assume that
+ * the event was filtered beforehand and no further filtering needs to occur in the method itself.</p>
+ *
+ * See also https://jira.qos.ch/browse/SLF4J-575
+ *
  * @author Ceki Gulcu
  * @since 2.0.0
  */

slf4j-api/src/main/java/org/slf4j/spi/MDCAdapter.java

@@ -93,7 +93,7 @@ public interface MDCAdapter {
     public void setContextMap(Map<String, String> contextMap);
     
     /**
-     * Push a value into the deque(stack) referenced by 'key'.
+     * Push a value into the <b>deque(stack)</b> referenced by 'key'.
      *      
      * @param key identifies the appropriate stack
      * @param value the value to push into the stack
@@ -102,7 +102,7 @@ public interface MDCAdapter {
     public void pushByKey(String key, String value);
     
     /**
-     * Pop the stack referenced by 'key' and return the value possibly null.
+     * Pop the <b>stack</b> referenced by 'key' and return the value possibly null.
      * 
      * @param key identifies the deque(stack)
      * @return the value just popped. May be null/
@@ -111,7 +111,7 @@ public interface MDCAdapter {
     public String popByKey(String key);
 
     /**
-     * Returns a copy of the deque(stack) referenced by 'key'. May be null.
+     * Returns a copy of the <b>deque(stack)</b> referenced by 'key'. May be null.
      * 
      * @param key identifies the  stack
      * @return copy of stack referenced by 'key'. May be null.
@@ -122,7 +122,7 @@ public interface MDCAdapter {
     
 
     /**
-     * Clear the deque(stack) referenced by 'key'. 
+     * Clear the <b>deque(stack)</b> referenced by 'key'.
      * 
      * @param key identifies the  stack
      * 

slf4j-api/src/main/resources/META-INF/MANIFEST.MF

@@ -1,14 +0,0 @@
-Implementation-Title: slf4j-api
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName: slf4j.api
-Bundle-Name: slf4j-api
-Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Export-Package: org.slf4j;version=${parsedVersion.osgiVersion},
-  org.slf4j.spi;version=${parsedVersion.osgiVersion},
-  org.slf4j.helpers;version=${parsedVersion.osgiVersion},
-  org.slf4j.event;version=${parsedVersion.osgiVersion}
-Import-Package: org.slf4j.spi;version=${parsedVersion.osgiVersion}
-Require-Capability: osgi.extender;filter:="(osgi.extender=osgi.service
- loader.processor)",osgi.serviceloader;filter:="(osgi.serviceloader=or
- g.slf4j.spi.SLF4JServiceProvider)"

slf4j-api/src/test/java/org/slf4j/LoggerFactoryTest.java

@@ -0,0 +1,91 @@
+package org.slf4j;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.spi.MDCAdapter;
+import org.slf4j.spi.SLF4JServiceProvider;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+
+import static org.hamcrest.CoreMatchers.is;
+import static org.junit.Assert.*;
+
+public class LoggerFactoryTest {
+    private PrintStream rawSyserr;
+    private ByteArrayOutputStream mockedSyserr;
+
+    final ClassLoader classLoaderOfLoggerFactory = LoggerFactory.class.getClassLoader();
+
+    @Before
+    public void setUp() {
+        rawSyserr = System.err;
+        mockedSyserr = new ByteArrayOutputStream();
+        System.setErr(new PrintStream(mockedSyserr));
+    }
+
+    @After
+    public void cleanUp() {
+        System.clearProperty(LoggerFactory.PROVIDER_PROPERTY_KEY);
+        System.setErr(rawSyserr);
+    }
+
+    @Test
+    public void testExplicitlySpecified() {
+        System.setProperty(LoggerFactory.PROVIDER_PROPERTY_KEY, "org.slf4j.LoggerFactoryTest$TestingProvider");
+        SLF4JServiceProvider provider = LoggerFactory.loadExplicitlySpecified(classLoaderOfLoggerFactory);
+        assertTrue("provider should be instance of TestingProvider class", provider instanceof  TestingProvider);
+        assertTrue(mockedSyserr.toString().contains(" Attempting to load provider \"org.slf4j.LoggerFactoryTest$TestingProvider\" specified via \"slf4j.provider\" system property"));
+        System.out.println(mockedSyserr.toString());
+
+
+    }
+
+    @Test
+    public void testExplicitlySpecifiedNull() {
+        assertNull(LoggerFactory.loadExplicitlySpecified(classLoaderOfLoggerFactory));
+    }
+
+    @Test
+    public void testExplicitlySpecifyMissingServiceProvider() {
+        System.setProperty(LoggerFactory.PROVIDER_PROPERTY_KEY, "com.example.ServiceProvider");
+        SLF4JServiceProvider provider = LoggerFactory.loadExplicitlySpecified(classLoaderOfLoggerFactory);
+        assertNull(provider);
+        assertTrue(mockedSyserr.toString().contains("Failed to instantiate the specified SLF4JServiceProvider (com.example.ServiceProvider)"));
+    }
+
+    @Test
+    public void testExplicitlySpecifyNonServiceProvider() {
+        System.setProperty(LoggerFactory.PROVIDER_PROPERTY_KEY, "java.lang.String");
+        assertNull(LoggerFactory.loadExplicitlySpecified(classLoaderOfLoggerFactory));
+        assertTrue(mockedSyserr.toString().contains("Specified SLF4JServiceProvider (java.lang.String) does not implement SLF4JServiceProvider interface"));
+    }
+
+    public static class TestingProvider implements SLF4JServiceProvider {
+        @Override
+        public ILoggerFactory getLoggerFactory() {
+            return null;
+        }
+
+        @Override
+        public IMarkerFactory getMarkerFactory() {
+            return null;
+        }
+
+        @Override
+        public MDCAdapter getMDCAdapter() {
+            return null;
+        }
+
+        @Override
+        public String getRequestedApiVersion() {
+            return null;
+        }
+
+        @Override
+        public void initialize() {
+
+        }
+    }
+}

slf4j-api/src/test/java/org/slf4j/basicTests/NoBindingTest.java

@@ -29,6 +29,8 @@ import static org.junit.Assert.assertTrue;
 
 import java.util.Random;
 
+import org.junit.After;
+import org.junit.Before;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -37,11 +39,21 @@ import org.slf4j.Marker;
 import org.slf4j.MarkerFactory;
 import org.slf4j.helpers.BasicMarker;
 import org.slf4j.helpers.NOPLogger;
+import org.slf4j.helpers.Reporter;
 
 public class NoBindingTest {
 
     int diff = new Random().nextInt(10000);
 
+    @Before
+    public void setUp() throws Exception {
+        System.setProperty(Reporter.SLF4J_INTERNAL_VERBOSITY_KEY, "debug");
+    }
+    @After
+    public void tearDown() throws Exception {
+        System.clearProperty(Reporter.SLF4J_INTERNAL_VERBOSITY_KEY);
+    }
+
     @Test
     public void testLogger() {
         Logger logger = LoggerFactory.getLogger(NoBindingTest.class);

slf4j-api/src/test/java/org/slf4j/testHarness/MultithreadedInitializationTest.java

@@ -36,16 +36,15 @@ abstract public class MultithreadedInitializationTest {
 
         assertAllSubstLoggersAreFixed();
         long recordedEventCount = getRecordedEventCount();
-        int LENIENCY_COUNT = 21;
+        int LENIENCY_COUNT = 30;
 
         long expectedEventCount = eventCount.get() + extraLogEvents();
 
-        assertTrue(expectedEventCount + " >= " + recordedEventCount, expectedEventCount >= recordedEventCount);
-        assertTrue(expectedEventCount + " < " + recordedEventCount + "+" + LENIENCY_COUNT, expectedEventCount < recordedEventCount + LENIENCY_COUNT);
-    }
+        assertTrue("unmet condition: " + expectedEventCount + " >= " + recordedEventCount, expectedEventCount >= recordedEventCount);
+        assertTrue("unmet condition: " + expectedEventCount + " < " + recordedEventCount + "+" + LENIENCY_COUNT, expectedEventCount < (recordedEventCount + LENIENCY_COUNT));   }
 
     abstract protected long getRecordedEventCount();
-
+    
     protected int extraLogEvents() {
         return 0;
     }

slf4j-ext/LICENSE.txt

@@ -0,0 +1,24 @@
+Copyright (c) 2004-2022 QOS.ch Sarl (Switzerland)
+All rights reserved.
+
+Permission is hereby granted, free  of charge, to any person obtaining
+a  copy  of this  software  and  associated  documentation files  (the
+"Software"), to  deal in  the Software without  restriction, including
+without limitation  the rights to  use, copy, modify,  merge, publish,
+distribute,  sublicense, and/or sell  copies of  the Software,  and to
+permit persons to whom the Software  is furnished to do so, subject to
+the following conditions:
+
+The  above  copyright  notice  and  this permission  notice  shall  be
+included in all copies or substantial portions of the Software.
+
+THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
+EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
+MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+

slf4j-ext/pom.xml

@@ -7,7 +7,8 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>slf4j-ext</artifactId>
@@ -73,8 +74,19 @@
           </archive>
         </configuration>
       </plugin>
-    </plugins>
 
+      <plugin>
+        <groupId>org.apache.felix</groupId>
+        <artifactId>maven-bundle-plugin</artifactId>
+        <configuration>
+          <instructions>
+            <Import-Package>ch.qos.cal10n;version="${cal10n.version}";resolution:="optional", org.slf4j, org.slf4j.*</Import-Package>
+            <_exportcontents>org.slf4j.ext, org.slf4j.profiler, org.slf4j.cal10n</_exportcontents>
+          </instructions>
+        </configuration>
+      </plugin>
+
+    </plugins>
   </build>
 
 </project>

slf4j-ext/src/main/resources/META-INF/MANIFEST.MF

@@ -1,8 +0,0 @@
-Implementation-Title: slf4j-ext
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName: slf4j.ext
-Bundle-Name: slf4j-ext
-Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Export-Package: org.slf4j.profiler;version=${parsedVersion.osgiVersion}, org.slf4j.cal10n;version=${parsedVersion.osgiVersion}, org.slf4j.ext;version=${parsedVersion.osgiVersion}
-Import-Package: org.slf4j;version=${parsedVersion.osgiVersion}, org.slf4j.spi;version=${parsedVersion.osgiVersion}, org.slf4j.helpers;version=${parsedVersion.osgiVersion}, ch.qos.cal10n;version=${cal10n.version};resolution:=optional

slf4j-jdk-platform-logging/LICENSE.txt

@@ -0,0 +1,24 @@
+Copyright (c) 2004-2022 QOS.ch Sarl (Switzerland)
+All rights reserved.
+
+Permission is hereby granted, free  of charge, to any person obtaining
+a  copy  of this  software  and  associated  documentation files  (the
+"Software"), to  deal in  the Software without  restriction, including
+without limitation  the rights to  use, copy, modify,  merge, publish,
+distribute,  sublicense, and/or sell  copies of  the Software,  and to
+permit persons to whom the Software  is furnished to do so, subject to
+the following conditions:
+
+The  above  copyright  notice  and  this permission  notice  shall  be
+included in all copies or substantial portions of the Software.
+
+THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
+EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
+MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+

slf4j-jdk-platform-logging/pom.xml

@@ -8,7 +8,8 @@
   <parent>
     <artifactId>slf4j-parent</artifactId>
     <groupId>org.slf4j</groupId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>slf4j-jdk-platform-logging</artifactId>

slf4j-jdk-platform-logging/src/main/java/org/slf4j/jdk/platform/logging/SLF4JPlatformLogger.java

@@ -26,10 +26,12 @@ package org.slf4j.jdk.platform.logging;
 
 import static java.util.Objects.requireNonNull;
 
+import java.text.MessageFormat;
 import java.util.MissingResourceException;
 import java.util.ResourceBundle;
 
 import org.slf4j.Logger;
+import org.slf4j.helpers.Reporter;
 import org.slf4j.spi.CallerBoundaryAware;
 import org.slf4j.spi.LoggingEventBuilder;
 
@@ -113,16 +115,11 @@ class SLF4JPlatformLogger implements System.Logger {
      * @param thrown
      * @param params
      */
-    private void log(Level jplLevel, ResourceBundle bundle, String msg, Throwable thrown, Object... params) {
-        if (jplLevel == Level.OFF)
-            return;
+    private void log(final Level jplLevel, final ResourceBundle bundle, final String msg, final Throwable thrown, final Object... params) {
 
-        if (jplLevel == Level.ALL) {
-            performLog(org.slf4j.event.Level.TRACE, bundle, msg, thrown, params);
-            return;
-        }
+        final Level jplLevelReduced = fixExtremeLevels(jplLevel);
 
-        org.slf4j.event.Level slf4jLevel = jplLevelToSLF4JLevel(jplLevel);
+        org.slf4j.event.Level slf4jLevel = jplLevelToSLF4JLevel(jplLevelReduced);
         boolean isEnabled = slf4jLogger.isEnabledForLevel(slf4jLevel);
 
         if (isEnabled) {
@@ -130,6 +127,27 @@ class SLF4JPlatformLogger implements System.Logger {
         }
     }
 
+    /**
+     * <p>Level.OFF and Level.ALL levels are not supposed to be used when calling log printing methods.
+     * </p>
+     *
+     * <p>We compensate for such incorrect usage by transforming Level.OFF as Level.ERROR and
+     * Level.ALL as Level.TRACE.
+     * </p>
+     *
+     * @param jplLevel
+     * @return
+     */
+    private Level fixExtremeLevels(Level jplLevel) {
+        if (jplLevel == Level.OFF)
+            return  Level.ERROR;
+
+        if (jplLevel == Level.ALL)
+            return Level.TRACE;
+
+        return jplLevel;
+    }
+
     private void performLog(org.slf4j.event.Level slf4jLevel, ResourceBundle bundle, String msg, Throwable thrown, Object... params) {
         String message = getResourceStringOrMessage(bundle, msg);
         LoggingEventBuilder leb = slf4jLogger.makeLoggingEventBuilder(slf4jLevel);
@@ -142,7 +160,7 @@ class SLF4JPlatformLogger implements System.Logger {
                 leb = leb.addArgument(p);
             }
             // The JDK uses a different formatting convention. We must invoke it now.
-            message = String.format(message, params);
+            message = MessageFormat.format(message, params);
         }
         if (leb instanceof CallerBoundaryAware) {
             CallerBoundaryAware cba = (CallerBoundaryAware) leb;
@@ -154,7 +172,7 @@ class SLF4JPlatformLogger implements System.Logger {
     private void reportUnknownLevel(Level jplLevel) {
         String message = "Unknown log level [" + jplLevel + "]";
         IllegalArgumentException iae = new IllegalArgumentException(message);
-        org.slf4j.helpers.Util.report("Unsupported log level", iae);
+        Reporter.error("Unsupported log level", iae);
     }
 
     private static String getResourceStringOrMessage(ResourceBundle bundle, String msg) {

slf4j-jdk-platform-logging/src/main/java/org/slf4j/jdk/platform/logging/SLF4JPlatformLoggerFactory.java

@@ -37,7 +37,7 @@ import org.slf4j.LoggerFactory;
  * @author Ceki
  *
  */
-public class SLF4JPlarformLoggerFactory {
+public class SLF4JPlatformLoggerFactory {
     ConcurrentMap<String, SLF4JPlatformLogger> loggerMap = new ConcurrentHashMap<>();
     
     /**

slf4j-jdk-platform-logging/src/main/java/org/slf4j/jdk/platform/logging/SLF4JSystemLoggerFinder.java

@@ -25,14 +25,14 @@
 package org.slf4j.jdk.platform.logging;
 
 /**
- * Uses {@link SLF4JPlarformLoggerFactory#getLogger(String)} to get a logger
+ * Uses {@link SLF4JPlatformLoggerFactory#getLogger(String)} to get a logger
  * that is adapted for {@link System.Logger}.
  * 
  * @since 2.0.0
  */
 public class SLF4JSystemLoggerFinder extends System.LoggerFinder {
 
-    final SLF4JPlarformLoggerFactory platformLoggerFactory = new SLF4JPlarformLoggerFactory();
+    final SLF4JPlatformLoggerFactory platformLoggerFactory = new SLF4JPlatformLoggerFactory();
     
     @Override
     public System.Logger getLogger(String name, Module module) {

slf4j-jdk-platform-logging/src/main/resources/META-INF/MANIFEST.MF

@@ -1,9 +0,0 @@
-Implementation-Title:  slf4j-jdk-platform-logging
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName:  slf4j.jdk.platform.logging
-Bundle-Name: slf4j-jdk-platform-logging
-Bundle-Vendor: SLF4J.ORG
-Require-Bundle: slf4j.api
-Bundle-RequiredExecutionEnvironment: JavaSE-9
-Export-Package: slf4j.jdk.platform.logging;version=${parsedVersion.osgiVersion}
-Import-Package: org.slf4j;version=${parsedVersion.osgiVersion}

slf4j-jdk-platform-logging/src/test/java/org/slf4j/jdk/platform/logging/test/SLF4JPlatformLoggingTest.java

@@ -39,6 +39,7 @@ import org.junit.After;
 import org.junit.AfterClass;
 import org.junit.BeforeClass;
 import org.junit.Test;
+import org.slf4j.LoggerFactory;
 
 /**
  * The present test is fragile in the sense that it sets up SimpleLogger
@@ -88,7 +89,7 @@ public class SLF4JPlatformLoggingTest {
         assertEquals(EXPECTED_FINDER_CLASS, finder.getClass().getName());
         Logger systemLogger = finder.getLogger("smoke", null);
         systemLogger.log(Level.INFO, "hello");
-        systemLogger.log(Level.INFO, "hello %s", "world");
+        systemLogger.log(Level.INFO, "hello {0}", "world");
         
         List<String> results = SPS.stringList;
         assertEquals(2, results.size());
@@ -108,12 +109,27 @@ public class SLF4JPlatformLoggingTest {
         //INFO throwTest - a problem
         //java.lang.Exception
         //        at org.slf4j.jdk.platform.logging/org.slf4j.jdk.platform.logging.SLF4JPlatformLoggingTest.throwTest(SLF4JPlatformLoggingTest.java:92)
-         
-        assertEquals("INFO throwTest - we have a problem", results.get(0));
-        assertEquals(Exception.class.getName(), results.get(1));
-        assertTrue(results.get(2).contains("at "));
-        assertTrue(results.get(2).contains(this.getClass().getName()));
+
+        int line = 0;
+        //assertTrue(results.get(0).startsWith("SLF4J(I): Connected with provider of type ["));
+        assertEquals("INFO throwTest - we have a problem", results.get(line++));
+        assertEquals(Exception.class.getName(), results.get(line++));
+        assertTrue(results.get(line).contains("at "));
+        assertTrue(results.get(line++).contains(this.getClass().getName()));
     }
 
+    @Test
+    public void extremeLevels() throws IOException {
+        LoggerFinder finder = System.LoggerFinder.getLoggerFinder();
+        assertEquals(EXPECTED_FINDER_CLASS, finder.getClass().getName());
+        Logger systemLogger = finder.getLogger("extremeLevels", null);
+        systemLogger.log(Level.OFF, "hello");
+        systemLogger.log(Level.ALL, "world");
+
+        List<String> results = SPS.stringList;
+        assertEquals(1, results.size());
+        assertEquals("ERROR extremeLevels - hello", results.get(0));
+
+    }
 
 }

slf4j-jdk14/LICENSE.txt

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2007 QOS.ch
+Copyright (c) 2004-2023 QOS.ch
 All rights reserved.
 
 Permission is hereby granted, free  of charge, to any person obtaining

slf4j-jdk14/pom.xml

@@ -7,17 +7,20 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>slf4j-jdk14</artifactId>
   <packaging>jar</packaging>
-  <name>SLF4J JDK14 Binding</name>
-  <description>SLF4J JDK14 Binding</description>
+  <name>SLF4J JDK14 Provider</name>
+  <description>SLF4J JDK14 Provider</description>
   <url>http://www.slf4j.org</url>
 
   <properties>
     <module-name>org.slf4j.jul</module-name>
+    <slf4j.provider.implementation>org.slf4j.jul.JULServiceProvider</slf4j.provider.implementation>
+    <slf4j.provider.type>jul</slf4j.provider.type>
   </properties>
 
   <dependencies>

slf4j-jdk14/src/main/java/org/slf4j/jul/JDK14LoggerAdapter.java

@@ -55,6 +55,8 @@ public final class JDK14LoggerAdapter extends LegacyAbstractLogger implements Lo
 
     transient final java.util.logging.Logger logger;
 
+    static int NOT_FOUND = -1;
+
     // WARN: JDK14LoggerAdapter constructor should have only package access so
     // that only JDK14LoggerFactory be able to create one.
     JDK14LoggerAdapter(java.util.logging.Logger logger) {
@@ -181,26 +183,10 @@ public final class JDK14LoggerAdapter extends LegacyAbstractLogger implements Lo
     final private void fillCallerData(String callerFQCN, LogRecord record) {
         StackTraceElement[] steArray = new Throwable().getStackTrace();
 
-        int selfIndex = -1;
-        for (int i = 0; i < steArray.length; i++) {
-            final String className = steArray[i].getClassName();
+        int furthestIndex = findFurthestIndex(callerFQCN, steArray);
 
-            if (barrierMatch(callerFQCN, className)) {
-                selfIndex = i;
-                break;
-            }
-        }
-
-        int found = -1;
-        for (int i = selfIndex + 1; i < steArray.length; i++) {
-            final String className = steArray[i].getClassName();
-            if (!(barrierMatch(callerFQCN, className))) {
-                found = i;
-                break;
-            }
-        }
-
-        if (found != -1) {
+        if (furthestIndex != NOT_FOUND) {
+            int found = furthestIndex+1;
             StackTraceElement ste = steArray[found];
             // setting the class name has the side effect of setting
             // the needToInferCaller variable to false.
@@ -209,7 +195,24 @@ public final class JDK14LoggerAdapter extends LegacyAbstractLogger implements Lo
         }
     }
 
-    static String SELF = JDK14LoggerAdapter.class.getName();
+    // find the furthest index which matches any of the barrier classes
+    // We assume that the actual caller is at most MAX_SEARCH_DEPTH calls away
+    private int findFurthestIndex(String callerFQCN, StackTraceElement[] steArray) {
+
+        final int maxIndex = Math.min(MAX_SEARCH_DEPTH, steArray.length);
+        int furthestIndex = NOT_FOUND;
+
+        for (int i = 0; i < maxIndex; i++) {
+            final String className = steArray[i].getClassName();
+            if (barrierMatch(callerFQCN, className)) {
+                furthestIndex = i;
+            }
+        }
+        return furthestIndex;
+    }
+
+   static final int MAX_SEARCH_DEPTH = 12;
+   static String SELF = JDK14LoggerAdapter.class.getName();
 
     static String SUPER = LegacyAbstractLogger.class.getName();
     static String SUPER_OF_SUPER = AbstractLogger.class.getName();

slf4j-jdk14/src/main/java/org/slf4j/jul/JULServiceProvider.java

@@ -17,8 +17,16 @@ public class JULServiceProvider implements SLF4JServiceProvider {
     public static String REQUESTED_API_VERSION = "2.0.99"; // !final
 
     private ILoggerFactory loggerFactory;
-    private IMarkerFactory markerFactory;
-    private MDCAdapter mdcAdapter;
+    // LoggerFactory expects providers to initialize markerFactory as early as possible.
+    private final IMarkerFactory markerFactory;
+    // LoggerFactory expects providers to initialize their MDCAdapter field
+    // as early as possible, preferably at construction time.
+    private final MDCAdapter mdcAdapter;
+
+    public JULServiceProvider() {
+        markerFactory = new BasicMarkerFactory();
+        mdcAdapter = new BasicMDCAdapter();
+    }
 
     @Override
     public ILoggerFactory getLoggerFactory() {
@@ -42,7 +50,5 @@ public class JULServiceProvider implements SLF4JServiceProvider {
     @Override
     public void initialize() {
         loggerFactory = new JDK14LoggerFactory();
-        markerFactory = new BasicMarkerFactory();
-        mdcAdapter = new BasicMDCAdapter();
     }
 }

slf4j-jdk14/src/main/java9/module-info.java

@@ -2,5 +2,8 @@ module org.slf4j.jul {
   requires org.slf4j;
   requires java.logging;
   provides org.slf4j.spi.SLF4JServiceProvider with org.slf4j.jul.JULServiceProvider;
+
+  exports org.slf4j.jul;
+  opens org.slf4j.jul to org.slf4j;
 }
 

slf4j-jdk14/src/main/resources/META-INF/MANIFEST.MF

@@ -1,13 +0,0 @@
-Implementation-Title: slf4j-jdk14
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName: slf4j.jdk14
-Bundle-Name: slf4j-jdk14
-Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Export-Package: org.slf4j.jul;version=${parsedVersion.osgiVersion}
-Import-Package: org.slf4j;version=${parsedVersion.osgiVersion},
- org.slf4j.spi;version=${parsedVersion.osgiVersion},
- org.slf4j.helpers;version=${parsedVersion.osgiVersion},
- org.slf4j.event;version=${parsedVersion.osgiVersion}
-Require-Capability: osgi.extender;filter:="(osgi.extender=osgi.serviceloader.registrar)"
-Provide-Capability: osgi.serviceloader;osgi.serviceloader=org.slf4j.spi.SLF4JServiceProvider

slf4j-jdk14/src/test/java/org/slf4j/issue/CallerInfoTest.java

@@ -19,6 +19,8 @@ import org.slf4j.event.SubstituteLoggingEvent;
 import org.slf4j.helpers.SubstituteLogger;
 import org.slf4j.helpers.SubstituteServiceProvider;
 import org.slf4j.jul.ListHandler;
+import org.slf4j.spi.CallerBoundaryAware;
+import org.slf4j.spi.LoggingEventBuilder;
 
 public class CallerInfoTest {
     Level oldLevel;
@@ -77,6 +79,22 @@ public class CallerInfoTest {
         assertEquals(this.getClass().getName(), logRecod.getSourceClassName());
     }
 
+    @Test
+    public void testCallerInfoWithFluentAPIAndAWrapper() {
+        Logger logger = LoggerFactory.getLogger("bla");
+        LoggingWrapper wrappedLogger = new LoggingWrapper(logger);
+
+        wrappedLogger.logWithEvent("hello");
+
+        List<LogRecord> recordList = listHandler.recordList;
+
+        assertEquals(1, recordList.size());
+
+        LogRecord logRecod = recordList.get(0);
+        assertEquals(this.getClass().getName(), logRecod.getSourceClassName());
+    }
+
+
     @Test
     public void testPostInitializationCallerInfoWithSubstituteLogger() {
         Logger logger = LoggerFactory.getLogger("bla");
@@ -119,4 +137,22 @@ public class CallerInfoTest {
         assertEquals(EventConstants.NA_SUBST, logRecod.getSourceClassName());
     }
 
+    static class LoggingWrapper {
+
+        Logger underlyingLogger;
+
+        LoggingWrapper(Logger aLogger) {
+            this.underlyingLogger = aLogger;
+        }
+        public void logWithEvent(String msg) {
+            LoggingEventBuilder lev = underlyingLogger.atInfo();
+            // setting the caller boundary to LoggingWrapper
+            if(lev instanceof CallerBoundaryAware) {
+                // builder is CallerBoundaryAware
+                ((CallerBoundaryAware) lev).setCallerBoundary(LoggingWrapper.class.getName());
+            }
+            lev.log(msg);
+        }
+    }
+
 }

slf4j-log4j12/LICENSE.txt

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2007 QOS.ch
+Copyright (c) 2004-2023 QOS.ch
 All rights reserved.
 
 Permission is hereby granted, free  of charge, to any person obtaining

slf4j-log4j12/pom.xml

@@ -8,7 +8,8 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
   
   <artifactId>slf4j-log4j12</artifactId>
@@ -23,7 +24,7 @@
     <relocation>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-reload4j</artifactId>
-      <version>2.0.3</version>      
+      <version>2.0.18</version>      
     </relocation>
   </distributionManagement>
 

slf4j-migrator/LICENSE.txt

@@ -0,0 +1,24 @@
+Copyright (c) 2004-2022 QOS.ch Sarl (Switzerland)
+All rights reserved.
+
+Permission is hereby granted, free  of charge, to any person obtaining
+a  copy  of this  software  and  associated  documentation files  (the
+"Software"), to  deal in  the Software without  restriction, including
+without limitation  the rights to  use, copy, modify,  merge, publish,
+distribute,  sublicense, and/or sell  copies of  the Software,  and to
+permit persons to whom the Software  is furnished to do so, subject to
+the following conditions:
+
+The  above  copyright  notice  and  this permission  notice  shall  be
+included in all copies or substantial portions of the Software.
+
+THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
+EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
+MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+
+

slf4j-migrator/pom.xml

@@ -7,7 +7,8 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>slf4j-migrator</artifactId>
@@ -16,4 +17,23 @@
   <name>SLF4J Migrator</name>
   <description>SLF4J Migrator</description>
 
+  <build>
+    <plugins>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-jar-plugin</artifactId>
+        <version>${maven-jar-plugin.version}</version>
+        <configuration>
+          <archive>
+            <manifest>
+              <mainClass>org.slf4j.migrator.Main</mainClass>
+            </manifest>
+          </archive>
+        </configuration>
+      </plugin>
+
+    </plugins>
+  </build>
+
 </project>

slf4j-migrator/src/main/resources/META-INF/MANIFEST.MF

@@ -1 +0,0 @@
-Main-Class: org.slf4j.migrator.Main

slf4j-nop/LICENSE.txt

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2007 QOS.ch
+Copyright (c) 2004-2023 QOS.ch
 All rights reserved.
 
 Permission is hereby granted, free  of charge, to any person obtaining

slf4j-nop/pom.xml

@@ -7,18 +7,21 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>slf4j-nop</artifactId>
 
   <packaging>jar</packaging>
-  <name>SLF4J NOP Binding</name>
-  <description>SLF4J NOP Binding</description>
+  <name>SLF4J NOP Provider</name>
+  <description>SLF4J NOP Provider</description>
   <url>http://www.slf4j.org</url>
 
   <properties>
     <module-name>org.slf4j.nop</module-name>
+    <slf4j.provider.implementation>org.slf4j.nop.NOPServiceProvider</slf4j.provider.implementation>
+    <slf4j.provider.type>nop</slf4j.provider.type>
   </properties>
 
   <dependencies>
@@ -26,6 +29,14 @@
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
     </dependency>
+
+    <dependency>
+      <groupId>org.slf4j</groupId>
+      <artifactId>slf4j-api</artifactId>
+      <type>test-jar</type>
+      <version>${project.version}</version>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
 </project>

slf4j-nop/src/main/java/org/slf4j/nop/NOPServiceProvider.java

@@ -18,9 +18,18 @@ public class NOPServiceProvider implements SLF4JServiceProvider {
     public static String REQUESTED_API_VERSION = "2.0.99"; // !final
 
     private final ILoggerFactory loggerFactory = new NOPLoggerFactory();
-    private final IMarkerFactory markerFactory = new BasicMarkerFactory();
-    private final MDCAdapter mdcAdapter = new NOPMDCAdapter();
 
+    // LoggerFactory expects providers to initialize markerFactory as early as possible.
+    private final IMarkerFactory markerFactory;
+    
+    // LoggerFactory expects providers to initialize their MDCAdapter field
+    // as early as possible, preferably at construction time.
+    private final MDCAdapter mdcAdapter;
+
+    public NOPServiceProvider() {
+        markerFactory = new BasicMarkerFactory();
+        mdcAdapter = new NOPMDCAdapter();
+    }
     public ILoggerFactory getLoggerFactory() {
         return loggerFactory;
     }
@@ -39,7 +48,6 @@ public class NOPServiceProvider implements SLF4JServiceProvider {
     }
 
     public void initialize() {
-
     }
 
    

slf4j-nop/src/main/java9/module-info.java

@@ -1,4 +1,7 @@
 module org.slf4j.nop { 
   requires org.slf4j;
   provides org.slf4j.spi.SLF4JServiceProvider with org.slf4j.nop.NOPServiceProvider;
+
+  exports org.slf4j.nop;
+  opens org.slf4j.nop to org.slf4j;
 }

slf4j-nop/src/main/resources/META-INF/MANIFEST.MF

@@ -1,11 +0,0 @@
-Implementation-Title: slf4j-nop
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName: slf4j.nop
-Bundle-Name: slf4j-nop
-Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Export-Package: org.slf4j.nop;version=${parsedVersion.osgiVersion}
-Import-Package: org.slf4j;version=${parsedVersion.osgiVersion},
- org.slf4j.spi;version=${parsedVersion.osgiVersion},
- org.slf4j.helpers;version=${parsedVersion.osgiVersion},
- org.slf4j.event;version=${parsedVersion.osgiVersion}

slf4j-nop/src/test/java/org/slf4j/nop/MultithreadedInitializationTest.java

@@ -1,7 +1,7 @@
 /**
  * Copyright (c) 2004-2016 QOS.ch
  * All rights reserved.
- *
+ * <p>
  * Permission is hereby granted, free  of charge, to any person obtaining
  * a  copy  of this  software  and  associated  documentation files  (the
  * "Software"), to  deal in  the Software without  restriction, including
@@ -9,10 +9,10 @@
  * distribute,  sublicense, and/or sell  copies of  the Software,  and to
  * permit persons to whom the Software  is furnished to do so, subject to
  * the following conditions:
- *
+ * <p>
  * The  above  copyright  notice  and  this permission  notice  shall  be
  * included in all copies or substantial portions of the Software.
- *
+ * <p>
  * THE  SOFTWARE IS  PROVIDED  "AS  IS", WITHOUT  WARRANTY  OF ANY  KIND,
  * EXPRESS OR  IMPLIED, INCLUDING  BUT NOT LIMITED  TO THE  WARRANTIES OF
  * MERCHANTABILITY,    FITNESS    FOR    A   PARTICULAR    PURPOSE    AND
@@ -20,29 +20,29 @@
  * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  * OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
  * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- *
  */
 package org.slf4j.nop;
 
-import static org.junit.Assert.assertEquals;
-
-import java.io.PrintStream;
-import java.util.ArrayList;
-import java.util.List;
-import java.util.Random;
-import java.util.concurrent.BrokenBarrierException;
-import java.util.concurrent.CyclicBarrier;
-import java.util.concurrent.atomic.AtomicLong;
-
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Test;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.slf4j.LoggerFactoryFriend;
+import org.slf4j.helpers.StringPrintStream;
+
+import java.io.PrintStream;
+import java.util.Random;
+import java.util.concurrent.BrokenBarrierException;
+import java.util.concurrent.CyclicBarrier;
+import java.util.concurrent.atomic.AtomicLong;
+
+import static org.junit.Assert.assertEquals;
+import static org.slf4j.helpers.Reporter.SLF4J_INTERNAL_VERBOSITY_KEY;
 
 public class MultithreadedInitializationTest {
 
+    static int NUM_LINES_IN_SLF4J_CONNECTED_WITH_PROVIDER_INFO = 1;
     final static int THREAD_COUNT = 4 + Runtime.getRuntime().availableProcessors() * 2;
 
     private static final AtomicLong EVENT_COUNT = new AtomicLong(0);
@@ -52,16 +52,18 @@ public class MultithreadedInitializationTest {
     int diff = new Random().nextInt(10000);
     String loggerName = "org.slf4j.impl.MultithreadedInitializationTest";
     private final PrintStream oldErr = System.err;
-    StringPrintStream sps = new StringPrintStream(oldErr);
+    StringPrintStream sps = new StringPrintStream(oldErr, false);
 
     @Before
     public void setup() {
+        System.setProperty(SLF4J_INTERNAL_VERBOSITY_KEY, "debug");
         LoggerFactoryFriend.reset();
         System.setErr(sps);
     }
 
     @After
     public void tearDown() throws Exception {
+        System.clearProperty(SLF4J_INTERNAL_VERBOSITY_KEY);
         LoggerFactoryFriend.reset();
         System.setErr(oldErr);
     }
@@ -71,7 +73,7 @@ public class MultithreadedInitializationTest {
         System.out.println("THREAD_COUNT=" + THREAD_COUNT);
         LoggerAccessingThread[] accessors = harness();
 
-        for (LoggerAccessingThread accessor : accessors) {
+        for(LoggerAccessingThread accessor : accessors) {
             EVENT_COUNT.getAndIncrement();
             accessor.logger.info("post harness");
         }
@@ -80,19 +82,19 @@ public class MultithreadedInitializationTest {
         logger.info("hello");
         EVENT_COUNT.getAndIncrement();
 
-        assertEquals(0, sps.stringList.size());
+        assertEquals(NUM_LINES_IN_SLF4J_CONNECTED_WITH_PROVIDER_INFO, sps.stringList.size());
     }
 
     private static LoggerAccessingThread[] harness() throws InterruptedException, BrokenBarrierException {
         LoggerAccessingThread[] threads = new LoggerAccessingThread[THREAD_COUNT];
         final CyclicBarrier barrier = new CyclicBarrier(THREAD_COUNT + 1);
-        for (int i = 0; i < THREAD_COUNT; i++) {
+        for(int i = 0; i < THREAD_COUNT; i++) {
             threads[i] = new LoggerAccessingThread(barrier, i);
             threads[i].start();
         }
 
         barrier.await();
-        for (int i = 0; i < THREAD_COUNT; i++) {
+        for(int i = 0; i < THREAD_COUNT; i++) {
             threads[i].join();
         }
         return threads;
@@ -118,33 +120,35 @@ public class MultithreadedInitializationTest {
             logger.info("in run method");
             EVENT_COUNT.getAndIncrement();
         }
-    };
+    }
 
-    public static class StringPrintStream extends PrintStream {
+    ;
 
-        public static final String LINE_SEP = System.getProperty("line.separator");
-        PrintStream other;
-        List<String> stringList = new ArrayList<>();
-
-        public StringPrintStream(PrintStream ps) {
-            super(ps);
-            other = ps;
-        }
-
-        public void print(String s) {
-            other.print(s);
-            stringList.add(s);
-        }
-
-        public void println(String s) {
-            other.println(s);
-            stringList.add(s);
-        }
-
-        public void println(Object o) {
-            other.println(o);
-            stringList.add(o.toString());
-        }
-    };
+//    public static class StringPrintStream extends PrintStream {
+//
+//        public static final String LINE_SEP = System.getProperty("line.separator");
+//        PrintStream other;
+//        List<String> stringList = new ArrayList<>();
+//
+//        public StringPrintStream(PrintStream ps) {
+//            super(ps);
+//            other = ps;
+//        }
+//
+//        public void print(String s) {
+//            other.print(s);
+//            stringList.add(s);
+//        }
+//
+//        public void println(String s) {
+//            other.println(s);
+//            stringList.add(s);
+//        }
+//
+//        public void println(Object o) {
+//            other.println(o);
+//            stringList.add(o.toString());
+//        }
+//    };
 
 }

slf4j-reload4j/LICENSE.txt

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2022 QOS.ch Sarl (Switzerland)
+Copyright (c) 2004-2023 QOS.ch Sarl (Switzerland)
 All rights reserved.
 
 Permission is hereby granted, free  of charge, to any person obtaining

slf4j-reload4j/pom.xml

@@ -7,18 +7,23 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>slf4j-reload4j</artifactId>
 
 
   <packaging>jar</packaging>
- <name>SLF4J Reload4j Binding</name>
-  <description>SLF4J Reload4j Binding</description>
+  <name>SLF4J Reload4j Provider</name>
+  <description>SLF4J Reload4j Provider</description>
   <url>http://reload4j.qos.ch</url>
-  
-  
+
+  <properties>
+    <slf4j.provider.implementation>org.slf4j.reload4j.Reload4jServiceProvider</slf4j.provider.implementation>
+    <slf4j.provider.type>reload4j</slf4j.provider.type>
+  </properties>
+
   <dependencies>
     <dependency>
       <groupId>org.slf4j</groupId>
@@ -29,7 +34,7 @@
       <groupId>ch.qos.reload4j</groupId>
       <artifactId>reload4j</artifactId>
     </dependency>
-    
+
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
@@ -42,11 +47,10 @@
 
   <build>
     <plugins>
-        
+
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-surefire-plugin</artifactId>
-        <version>2.19.1</version>
         <configuration>
           <forkCount>1</forkCount>
           <reuseForks>false</reuseForks>
@@ -56,12 +60,11 @@
             <exclude>**/AllTest.java</exclude>
             <exclude>**/PackageTest.java</exclude>
           </excludes>
-          <argLine>-Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8001</argLine>
+          <!--<argLine>-Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8001</argLine> -->
           <!--<argLine>XXadd-opens log4j/org.apache.log4j=org.slf4j.log4j12</argLine>-->
         </configuration>
-      </plugin>     
-        
- 
+      </plugin>
+
     </plugins>
   </build>
 </project>

slf4j-reload4j/src/main/java/org/slf4j/reload4j/Reload4jLoggerFactory.java

@@ -30,6 +30,7 @@ import java.util.concurrent.ConcurrentMap;
 import org.apache.log4j.LogManager;
 import org.slf4j.ILoggerFactory;
 import org.slf4j.Logger;
+import org.slf4j.helpers.Reporter;
 import org.slf4j.helpers.Util;
 
 /**
@@ -49,8 +50,8 @@ public class Reload4jLoggerFactory implements ILoggerFactory {
             String part1 = "Detected both log4j-over-slf4j.jar AND bound slf4j-log4j12.jar on the class path, preempting StackOverflowError. ";
             String part2 = "See also " + LOG4J_DELEGATION_LOOP_URL + " for more details.";
 
-            Util.report(part1);
-            Util.report(part2);
+            Reporter.error(part1);
+            Reporter.error(part2);
             throw new IllegalStateException(part1 + part2);
         } catch (ClassNotFoundException e) {
             // this is the good case

slf4j-reload4j/src/main/java/org/slf4j/reload4j/Reload4jServiceProvider.java

@@ -4,6 +4,7 @@ import org.apache.log4j.Level;
 import org.slf4j.ILoggerFactory;
 import org.slf4j.IMarkerFactory;
 import org.slf4j.helpers.BasicMarkerFactory;
+import org.slf4j.helpers.Reporter;
 import org.slf4j.helpers.Util;
 import org.slf4j.spi.MDCAdapter;
 import org.slf4j.spi.SLF4JServiceProvider;
@@ -18,23 +19,28 @@ public class Reload4jServiceProvider implements SLF4JServiceProvider {
     public static String REQUESTED_API_VERSION = "2.0.99"; // !final
 
     private ILoggerFactory loggerFactory;
-    private IMarkerFactory markerFactory;
-    private MDCAdapter mdcAdapter;
+
+    // LoggerFactory expects providers to initialize markerFactory as early as possible.
+    private final IMarkerFactory markerFactory;
+
+    // LoggerFactory expects providers to have a valid MDCAdapter field
+    // as early as possible, preferably at construction time.
+    private final MDCAdapter mdcAdapter;
 
     public Reload4jServiceProvider() {
+        markerFactory = new BasicMarkerFactory();
+        mdcAdapter = new Reload4jMDCAdapter();
         try {
             @SuppressWarnings("unused")
             Level level = Level.TRACE;
         } catch (NoSuchFieldError nsfe) {
-            Util.report("This version of SLF4J requires log4j version 1.2.12 or later. See also http://www.slf4j.org/codes.html#log4j_version");
+            Reporter.error("This version of SLF4J requires log4j version 1.2.12 or later. See also http://www.slf4j.org/codes.html#log4j_version");
         }
     }
 
     @Override
     public void initialize() {
         loggerFactory = new Reload4jLoggerFactory();
-        markerFactory = new BasicMarkerFactory();
-        mdcAdapter = new Reload4jMDCAdapter();
     }
 
     @Override

slf4j-reload4j/src/main/resources/META-INF/MANIFEST.MF

@@ -1,12 +0,0 @@
-Implementation-Title: slf4j-reload4j
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName: slf4j.reload4j
-Bundle-Name: slf4j-reload4j
-Bundle-Vendor: SLF4J.ORG
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Export-Package: org.slf4j.reload4j;version=${parsedVersion.osgiVersion}
-Import-Package: org.slf4j;version=${parsedVersion.osgiVersion},
- org.slf4j.spi;version=${parsedVersion.osgiVersion},
- org.slf4j.helpers;version=${parsedVersion.osgiVersion},
- org.slf4j.event;version=${parsedVersion.osgiVersion},
- org.apache.log4j

slf4j-simple/LICENSE.txt

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2007 QOS.ch
+Copyright (c) 2004-2023 QOS.ch
 All rights reserved.
 
 Permission is hereby granted, free  of charge, to any person obtaining

slf4j-simple/pom.xml

@@ -7,17 +7,20 @@
   <parent>
     <groupId>org.slf4j</groupId>
     <artifactId>slf4j-parent</artifactId>
-    <version>2.0.3</version>
+    <version>2.0.19-SNAPSHOT</version>
+    <relativePath>../parent/pom.xml</relativePath>
   </parent>
 
   <artifactId>slf4j-simple</artifactId>
   <packaging>jar</packaging>
-  <name>SLF4J Simple Binding</name>
-  <description>SLF4J Simple binding</description>
+  <name>SLF4J Simple Provider</name>
+  <description>SLF4J Simple Provider</description>
   <url>http://www.slf4j.org</url>
 
   <properties>
     <module-name>org.slf4j.simple</module-name>
+    <slf4j.provider.implementation>org.slf4j.simple.SimpleServiceProvider</slf4j.provider.implementation>
+    <slf4j.provider.type>simple</slf4j.provider.type>
   </properties>
 
   <dependencies>
@@ -25,7 +28,7 @@
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>
     </dependency>
-    
+
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>slf4j-api</artifactId>

slf4j-simple/src/main/java/org/slf4j/simple/SimpleLogger.java

@@ -221,10 +221,10 @@ public class SimpleLogger extends LegacyAbstractLogger {
     public static final String DEFAULT_LOG_LEVEL_KEY = SimpleLogger.SYSTEM_PREFIX + "defaultLogLevel";
 
     /**
-     * Package access allows only {@link SimpleLoggerFactory} to instantiate
+     * Protected access allows only {@link SimpleLoggerFactory} and also derived classes to instantiate
      * SimpleLogger instances.
      */
-    SimpleLogger(String name) {
+    protected SimpleLogger(String name) {
         this.name = name;
 
         String levelString = recursivelyComputeLevelString();
@@ -409,7 +409,7 @@ public class SimpleLogger extends LegacyAbstractLogger {
             buf.append('[');
 
         // Append a readable representation of the log level
-        String levelStr = level.name();
+        String levelStr = renderLevel(level.toInt());
         buf.append(levelStr);
         if (CONFIG_PARAMS.levelInBrackets)
             buf.append(']');
@@ -439,6 +439,22 @@ public class SimpleLogger extends LegacyAbstractLogger {
         write(buf, t);
     }
 
+    protected String renderLevel(int levelInt) {
+        switch (levelInt) {
+            case LOG_LEVEL_TRACE:
+                return "TRACE";
+            case LOG_LEVEL_DEBUG:
+                return("DEBUG");
+            case LOG_LEVEL_INFO:
+                return "INFO";
+            case LOG_LEVEL_WARN:
+                return CONFIG_PARAMS.warnLevelString;
+            case LOG_LEVEL_ERROR:
+                return "ERROR";
+        }
+        throw new IllegalStateException("Unrecognized level ["+levelInt+"]");
+    }
+
     public void log(LoggingEvent event) {
         int levelInt = event.getLevel().toInt();
 

slf4j-simple/src/main/java/org/slf4j/simple/SimpleLoggerConfiguration.java

@@ -10,6 +10,7 @@ import java.text.DateFormat;
 import java.text.SimpleDateFormat;
 import java.util.Properties;
 
+import org.slf4j.helpers.Reporter;
 import org.slf4j.helpers.Util;
 import org.slf4j.simple.OutputChoice.OutputChoiceType;
 
@@ -98,7 +99,7 @@ public class SimpleLoggerConfiguration {
             try {
                 dateFormatter = new SimpleDateFormat(dateTimeFormatStr);
             } catch (IllegalArgumentException e) {
-                Util.report("Bad date format in " + CONFIGURATION_FILE + "; will output relative time", e);
+                Reporter.error("Bad date format in " + CONFIGURATION_FILE + "; will output relative time", e);
             }
         }
     }
@@ -183,7 +184,7 @@ public class SimpleLoggerConfiguration {
                 PrintStream printStream = new PrintStream(fos);
                 return new OutputChoice(printStream);
             } catch (FileNotFoundException e) {
-                Util.report("Could not open [" + logFile + "]. Defaulting to System.err", e);
+                Reporter.error("Could not open [" + logFile + "]. Defaulting to System.err", e);
                 return new OutputChoice(OutputChoiceType.SYS_ERR);
             }
         }

slf4j-simple/src/main/java/org/slf4j/simple/SimpleLoggerFactory.java

@@ -47,28 +47,31 @@ public class SimpleLoggerFactory implements ILoggerFactory {
 
     /**
      * Return an appropriate {@link SimpleLogger} instance by name.
+     *
+     * This method will call {@link #createLogger(String)} if the logger
+     * has not been created yet.
      */
     public Logger getLogger(String name) {
-        Logger simpleLogger = loggerMap.get(name);
-        if (simpleLogger != null) {
-            return simpleLogger;
-        } else {
-            Logger newInstance = new SimpleLogger(name);
-            Logger oldInstance = loggerMap.putIfAbsent(name, newInstance);
-            return oldInstance == null ? newInstance : oldInstance;
-        }
+        return loggerMap.computeIfAbsent(name, this::createLogger);
+    }
+
+    /**
+     * Actually creates the logger for the given name.
+     */
+    protected Logger createLogger(String name) {
+        return new SimpleLogger(name);
     }
 
     /**
      * Clear the internal logger cache.
      *
-     * This method is intended to be called by classes (in the same package) for
-     * testing purposes. This method is internal. It can be modified, renamed or
-     * removed at any time without notice.
+     * This method is intended to be called by classes (in the same package or
+     * subclasses) for testing purposes. This method is internal. It can be
+     * modified, renamed or removed at any time without notice.
      *
      * You are strongly discouraged from calling this method in production code.
      */
-    void reset() {
+    protected void reset() {
         loggerMap.clear();
     }
 }

slf4j-simple/src/main/java/org/slf4j/simple/SimpleServiceProvider.java

@@ -17,8 +17,16 @@ public class SimpleServiceProvider implements SLF4JServiceProvider {
     public static String REQUESTED_API_VERSION = "2.0.99"; // !final
 
     private ILoggerFactory loggerFactory;
-    private IMarkerFactory markerFactory;
-    private MDCAdapter mdcAdapter;
+    // LoggerFactory expects providers to initialize markerFactory as early as possible.
+    private final IMarkerFactory  markerFactory;
+    // LoggerFactory expects providers to initialize their MDCAdapter field
+    // as early as possible, preferably at construction time.
+    private final MDCAdapter mdcAdapter;
+
+    public SimpleServiceProvider() {
+        markerFactory = new BasicMarkerFactory();
+        mdcAdapter =  new NOPMDCAdapter();
+    }
 
     public ILoggerFactory getLoggerFactory() {
         return loggerFactory;
@@ -41,10 +49,8 @@ public class SimpleServiceProvider implements SLF4JServiceProvider {
 
     @Override
     public void initialize() {
-
         loggerFactory = new SimpleLoggerFactory();
-        markerFactory = new BasicMarkerFactory();
-        mdcAdapter = new NOPMDCAdapter();
+
     }
 
 }

slf4j-simple/src/main/java9/module-info.java

@@ -1,4 +1,6 @@
-module org.slf4j.simple { 
+module org.slf4j.simple {
   requires org.slf4j;
   provides org.slf4j.spi.SLF4JServiceProvider with org.slf4j.simple.SimpleServiceProvider;
+  exports org.slf4j.simple;
+  opens org.slf4j.simple to org.slf4j;
 }

slf4j-simple/src/main/resources/META-INF/MANIFEST.MF

@@ -1,12 +0,0 @@
-Implementation-Title: slf4j-simple
-Bundle-ManifestVersion: 2
-Bundle-SymbolicName: slf4j.simple
-Bundle-Name: slf4j-simple
-Bundle-Vendor: SLF4J.ORG
-Require-Bundle: slf4j.api
-Bundle-RequiredExecutionEnvironment: JavaSE-1.8
-Export-Package: org.slf4j.simple;version=${parsedVersion.osgiVersion}
-Import-Package: org.slf4j;version=${parsedVersion.osgiVersion},
- org.slf4j.spi;version=${parsedVersion.osgiVersion},
- org.slf4j.helpers;version=${parsedVersion.osgiVersion},
- org.slf4j.event;version=${parsedVersion.osgiVersion}

slf4j-simple/src/test/java/org/slf4j/simple/AcceptanceTest.java

@@ -0,0 +1,50 @@
+package org.slf4j.simple;
+
+import org.junit.Ignore;
+import org.slf4j.Logger;
+import org.slf4j.event.Level;
+
+import java.io.PrintStream;
+
+@Ignore
+public class AcceptanceTest extends LoggerTestSuite {
+
+    @Override
+    public Logger createLogger(ListAppendingOutputStream outputStream, Level level) {
+        SimpleLogger.CONFIG_PARAMS.outputChoice = new OutputChoice(new PrintStream(outputStream));
+
+        SimpleLogger logger = new SimpleLogger("TestSuiteLogger");
+        logger.currentLogLevel = SimpleLoggerConfiguration.stringToLevel(level.toString());
+        return logger;
+    }
+
+    @Override
+    public String extractMessage(String message) {
+        return message
+                .split("\n")[0]
+                .split("- ")[1];
+    }
+
+    @Override
+    public String extractExceptionMessage(String message) {
+        String[] logLines = message.split("\n");
+
+        if (logLines.length < 2) {
+            return null;
+        }
+        String exceptionLine = logLines[1];
+        return exceptionLine.split(": ")[1];
+    }
+
+    @Override
+    public String extractExceptionType(String message) {
+        String[] logLines = message.split("\n");
+
+        if (logLines.length < 2) {
+            return null;
+        }
+        String exceptionLine = logLines[1];
+        return exceptionLine.split(": ")[0];
+    }
+
+}

slf4j-simple/src/test/java/org/slf4j/simple/ConfigParamsTest.java

@@ -0,0 +1,53 @@
+package org.slf4j.simple;
+
+import org.junit.BeforeClass;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.event.Level;
+
+import java.io.PrintStream;
+import java.util.ArrayList;
+import java.util.List;
+
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Test class to verify configuration parameters of SimpleLogger
+ *
+ * @since 2.0.18
+ */
+public class ConfigParamsTest {
+
+
+    private ListAppendingOutputStream prepareSink(List<String> outputList) {
+        return new ListAppendingOutputStream(outputList);
+    }
+
+    @BeforeClass
+    static public void resetConfigParams() {
+        SimpleLogger.CONFIG_PARAMS.init();
+    }
+
+    public Logger createLogger(ListAppendingOutputStream outputStream, Level level, String warnLevelString) {
+        SimpleLogger.CONFIG_PARAMS.outputChoice = new OutputChoice(new PrintStream(outputStream));
+
+        SimpleLogger.CONFIG_PARAMS.warnLevelString = warnLevelString;
+
+        SimpleLogger logger = new SimpleLogger(ConfigParamsTest.class.getName());
+        logger.currentLogLevel = SimpleLoggerConfiguration.stringToLevel(level.toString());
+        return logger;
+    }
+
+    @Test
+    public void simpleTest(){
+        String WARN_LEVEL_STRING = "WXYZ";
+        ArrayList<String> outputList = new ArrayList<>();
+        Logger configuredLogger = createLogger(prepareSink(outputList), Level.TRACE,  WARN_LEVEL_STRING);
+
+        configuredLogger.warn("This is a test");
+
+        String str0 = outputList.get(0);
+        assertTrue(str0.contains(WARN_LEVEL_STRING));
+
+    }
+}