mirror of https://github.com/qos-ch/slf4j
- preparing release 1.5.11
- added code to detect the simultaneous presence of both log4j-over-slf4j.jar and slf4j-log4j12.jar. See also http://slf4j.org/codes.html#log4jDelegationLoop - added code to detect the simultaneous presence of both jcl-over-slf4j.jar and slf4j-jcl.jar. See also http://slf4j.org/codes.html#jclDelegationLoop - Fixed http://bugzilla.slf4j.org/show_bug.cgi?id=168
This commit is contained in:
Ceki Gulcu
parent
99c9eb8a75
commit
dae55b8229
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@ -6,7 +6,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -3,7 +3,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -3,7 +3,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -6,7 +6,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -5,7 +5,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -45,6 +45,8 @@ public class Category {
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protected org.slf4j.Logger slf4jLogger;
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private org.slf4j.spi.LocationAwareLogger locationAwareLogger;
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private static Marker FATAL_MARKER = MarkerFactory.getMarker("FATAL");
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Category(String name) {
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@ -18,6 +18,8 @@ package org.apache.log4j;
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import java.util.Hashtable;
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import org.slf4j.helpers.Util;
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/**
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* This class is a factory that creates and maintains org.apache.log4j.Loggers
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* wrapping org.slf4j.Loggers.
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@ -32,12 +34,30 @@ class Log4jLoggerFactory {
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// String, Logger
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private static Hashtable log4jLoggers = new Hashtable();
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private static final String LOG4J_DELEGATION_LOOP_URL = "http://www.slf4j.org/codes.html#log4jDelegationLoop";
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// check for delegation loops
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static {
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try {
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Class.forName("org.slf4j.impl.Log4jLoggerFactory");
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String part1 = "Detected both log4j-over-slf4j.jar AND slf4j-log4j12.jar on the class path, preempting StackOverflowError. ";
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String part2 = "See also " + LOG4J_DELEGATION_LOOP_URL
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+ " for more details.";
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Util.reportFailure(part1);
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Util.reportFailure(part2);
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throw new IllegalStateException(part1 + part2);
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} catch (ClassNotFoundException e) {
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// this is the good case
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}
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}
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public static synchronized Logger getLogger(String name) {
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if (log4jLoggers.containsKey(name)) {
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return (org.apache.log4j.Logger) log4jLoggers.get(name);
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} else {
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Logger log4jLogger = new Logger(name);
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log4jLoggers.put(name, log4jLogger);
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return log4jLogger;
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}
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@ -3,7 +3,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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2
pom.xml
2
pom.xml
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@ -5,7 +5,7 @@
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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<packaging>pom</packaging>
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<name>SLF4J</name>
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@ -5,7 +5,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -85,7 +85,7 @@ public final class LoggerFactory {
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* compatibility. Thus, 1.5.7-SNAPSHOT, 1.5.7.RC0 are compatible with 1.5.7.
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*/
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static private final String[] API_COMPATIBILITY_LIST = new String[] {
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"1.5.5", "1.5.6", "1.5.7", "1.5.8", "1.5.9", "1.5.10" };
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"1.5.5", "1.5.6", "1.5.7", "1.5.8", "1.5.9", "1.5.10", "1.5.11" };
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// private constructor prevents instantiation
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private LoggerFactory() {
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@ -61,7 +61,7 @@ public class StaticLoggerBinder {
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* The value of this field is usually modified with each release.
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*/
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// to avoid constant folding by the compiler, this field must *not* be final
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public static String REQUESTED_API_VERSION = "1.5.10"; // !final
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public static String REQUESTED_API_VERSION = "1.5.11"; // !final
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private StaticLoggerBinder() {
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throw new UnsupportedOperationException("This code should have never made it into the jar");
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@ -5,7 +5,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -3,7 +3,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -39,6 +39,7 @@ import java.util.Map;
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import org.apache.commons.logging.LogFactory;
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import org.slf4j.ILoggerFactory;
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import org.slf4j.Logger;
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import org.slf4j.helpers.Util;
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/**
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* JCLLoggerFactory is an implementation of {@link ILoggerFactory} returning the
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@ -48,6 +49,24 @@ import org.slf4j.Logger;
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*/
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public class JCLLoggerFactory implements ILoggerFactory {
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private static final String JCL_DELEGATION_LOOP_URL = "http://www.slf4j.org/codes.html#jclDelegationLoop";
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// check for delegation loops
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static {
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try {
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Class.forName("org.apache.commons.logging.impl.SLF4JLogFactory");
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String part1 = "Detected both jcl-over-slf4j.jar AND slf4j-jcl.jar on the class path, preempting StackOverflowError. ";
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String part2 = "See also " + JCL_DELEGATION_LOOP_URL
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+ " for more details.";
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Util.reportFailure(part1);
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Util.reportFailure(part2);
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throw new IllegalStateException(part1 + part2);
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} catch (ClassNotFoundException e) {
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// this is the good case
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}
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}
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// key: name (String), value: a JCLLoggerAdapter;
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Map loggerMap;
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@ -65,7 +65,7 @@ public class StaticLoggerBinder implements LoggerFactoryBinder {
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*/
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//to avoid constant folding by the compiler, this field must *not* be final
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public static String REQUESTED_API_VERSION = "1.5.10";
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public static String REQUESTED_API_VERSION = "1.5.11";
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// Binding specific code:
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private static final String loggerFactoryClassStr = JCLLoggerFactory.class
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@ -6,7 +6,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -66,7 +66,7 @@ public class StaticLoggerBinder implements LoggerFactoryBinder {
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* The value of this field is usually modified with each release.
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*/
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// to avoid constant folding by the compiler, this field must *not* be final
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public static String REQUESTED_API_VERSION = "1.5.10"; // !final
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public static String REQUESTED_API_VERSION = "1.5.11"; // !final
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private static final String loggerFactoryClassStr = org.slf4j.impl.JDK14LoggerFactory.class.getName();
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@ -6,7 +6,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -66,7 +66,7 @@ public class StaticLoggerBinder implements LoggerFactoryBinder {
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* against. The value of this field is usually modified with each release.
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*/
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// to avoid constant folding by the compiler, this field must *not* be final
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public static String REQUESTED_API_VERSION = "1.5.10"; // !final
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public static String REQUESTED_API_VERSION = "1.5.11"; // !final
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private static final String loggerFactoryClassStr = Log4jLoggerFactory.class
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.getName();
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@ -7,7 +7,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -6,7 +6,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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@ -66,7 +66,7 @@ public class StaticLoggerBinder implements LoggerFactoryBinder {
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* The value of this field is usually modified with each release.
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*/
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// to avoid constant folding by the compiler, this field must *not* be final
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public static String REQUESTED_API_VERSION = "1.5.10"; // !final
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public static String REQUESTED_API_VERSION = "1.5.11"; // !final
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private static final String loggerFactoryClassStr = NOPLoggerFactory.class.getName();
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@ -6,7 +6,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
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<version>1.5.11</version>
|
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</parent>
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<modelVersion>4.0.0</modelVersion>
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|
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@ -6,7 +6,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
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<version>1.5.10</version>
|
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<version>1.5.11</version>
|
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</parent>
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<modelVersion>4.0.0</modelVersion>
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|
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|
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@ -3,7 +3,7 @@
|
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
|
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<version>1.5.10</version>
|
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<version>1.5.11</version>
|
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</parent>
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<modelVersion>4.0.0</modelVersion>
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|
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@ -58,7 +58,7 @@ public class StaticLoggerBinder implements LoggerFactoryBinder {
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* against. The value of this field is usually modified with each release.
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*/
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// to avoid constant folding by the compiler, this field must *not* be final
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public static String REQUESTED_API_VERSION = "1.5.10"; // !final
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public static String REQUESTED_API_VERSION = "1.5.11"; // !final
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private static final String loggerFactoryClassStr = SimpleLoggerFactory.class.getName();
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@ -5,7 +5,7 @@
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<parent>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-parent</artifactId>
|
||||
<version>1.5.10</version>
|
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<version>1.5.11</version>
|
||||
</parent>
|
||||
|
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<modelVersion>4.0.0</modelVersion>
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|
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@ -1,11 +1,13 @@
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/2000/REC-xhtml1-20000126/DTD/xhtml1-transitional.dtd">
|
||||
<html xmlns="http://www.w3.org/1999/xhtml">
|
||||
<head>
|
||||
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
|
||||
<title>SLF4J Error Codes</title>
|
||||
<link rel="stylesheet" type="text/css" media="screen" href="css/site.css" />
|
||||
<meta http-equiv="content-type" content="text/html; charset=iso-8859-1" />
|
||||
<title>SLF4J Error Codes</title>
|
||||
<link rel="stylesheet" type="text/css" media="screen" href="css/site.css" />
|
||||
<link rel="stylesheet" type="text/css" href="css/prettify.css" />
|
||||
</head>
|
||||
<body>
|
||||
<body onload="prettyPrint()">
|
||||
<script type="text/javascript" src="js/prettify.js"></script>
|
||||
<script type="text/javascript">prefix='';</script>
|
||||
|
||||
<script src="templates/header.js" type="text/javascript"></script>
|
||||
|
|
@ -13,6 +15,7 @@
|
|||
<script src="templates/left.js" type="text/javascript"></script>
|
||||
</div>
|
||||
|
||||
|
||||
<div id="content">
|
||||
|
||||
<center>
|
||||
|
|
@ -151,7 +154,7 @@
|
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<em>slf4j-simple-${version}.jar</em> and
|
||||
<em>slf4j-nop-${version}.jar</em> on the class path and you wish
|
||||
to use the nop (no-operation) binding, then remove
|
||||
<em>slf4j-simple-${version}.jar</em> from the class parh.</p>
|
||||
<em>slf4j-simple-${version}.jar</em> from the class path.</p>
|
||||
|
||||
|
||||
<!-- ====================================================== -->
|
||||
|
|
@ -168,7 +171,102 @@
|
|||
an effective remedy.
|
||||
</p>
|
||||
|
||||
|
||||
<!-- ====================================================== -->
|
||||
|
||||
<h3>
|
||||
<a name="log4jDelegationLoop"
|
||||
href="#log4jDelegationLoop">Detected both log4j-over-slf4j.jar
|
||||
AND slf4j-log4j12.jar on the class path, preempting
|
||||
<code>StackOverflowError</code>.</a>
|
||||
</h3>
|
||||
|
||||
<p>The purpose of slf4j-log4j12 module is to delegate or redirect
|
||||
calls made to an SLF4J logger to log4j. The purpose of the
|
||||
log4j-over-slf4j module is to redirect calls made to a log4j
|
||||
logger to SLF4J. If both <em>slf4j-log4j12.jar</em> and
|
||||
<em>log4j-over-slf4j.jar</em> are present on the class path, a
|
||||
<code>StackOverflowError</code> will inevitably occur immediately
|
||||
after the first invocation of an SLF4J or a log4j logger.
|
||||
</p>
|
||||
|
||||
<p>Here is how the exception might look like:</p>
|
||||
|
||||
<pre class="prettyprint source">Exception in thread "main" java.lang.StackOverflowError
|
||||
at java.util.Hashtable.containsKey(Hashtable.java:306)
|
||||
at org.apache.log4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:36)
|
||||
at org.apache.log4j.LogManager.getLogger(LogManager.java:39)
|
||||
at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:73)
|
||||
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:249)
|
||||
at org.apache.log4j.Category.<init>(Category.java:53)
|
||||
at org.apache.log4j.Logger..<init>(Logger.java:35)
|
||||
at org.apache.log4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:39)
|
||||
at org.apache.log4j.LogManager.getLogger(LogManager.java:39)
|
||||
at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:73)
|
||||
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:249)
|
||||
at org.apache.log4j.Category..<init>(Category.java:53)
|
||||
at org.apache.log4j.Logger..<init>(Logger.java:35)
|
||||
at org.apache.log4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:39)
|
||||
at org.apache.log4j.LogManager.getLogger(LogManager.java:39)
|
||||
subsequent lines omitted...</pre>
|
||||
|
||||
<p>As of SLF4J version 1.5.11, the code preempts the inevitable
|
||||
stack overflow error by throwing an exception with details about
|
||||
the actual cause of the problem. This is deemed to be better than
|
||||
leaving the user wondering about the reasons of the
|
||||
<code>StackOverflowError</code>.
|
||||
</p>
|
||||
|
||||
<p>For more background on this topic see <a
|
||||
href="legacy.html">Bridging legacy APIs</a>.
|
||||
</p>
|
||||
|
||||
<!-- ====================================================== -->
|
||||
|
||||
|
||||
<h3>
|
||||
<a name="jclDelegationLoop" href="#jclDelegationLoop">Detected
|
||||
both jcl-over-slf4j.jar AND slf4j-jcl.jar on the class path,
|
||||
preempting <code>StackOverflowError</code>.</a>
|
||||
</h3>
|
||||
|
||||
<p>The purpose of slf4j-jcl module is to delegate or redirect
|
||||
calls made to an SLF4J logger to jakarta commons logging
|
||||
(JCL). The purpose of the jcl-over-slf4j module is to redirect
|
||||
calls made to a JCL logger to SLF4J. If both
|
||||
<em>slf4j-jcl.jar</em> and <em>jcl-over-slf4j.jar</em> are present
|
||||
on the class path, then a <code>StackOverflowError</code> will
|
||||
inevitably occur immediately after the first invocation of an
|
||||
SLF4J or a JCL logger.
|
||||
</p>
|
||||
|
||||
<p>Here is how the exception might look like:</p>
|
||||
|
||||
<pre class="prettyprint source">Exception in thread "main" java.lang.StackOverflowError
|
||||
at java.lang.String.hashCode(String.java:1482)
|
||||
at java.util.HashMap.get(HashMap.java:300)
|
||||
at org.slf4j.impl.JCLLoggerFactory.getLogger(JCLLoggerFactory.java:67)
|
||||
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:249)
|
||||
at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)
|
||||
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:289)
|
||||
at org.slf4j.impl.JCLLoggerFactory.getLogger(JCLLoggerFactory.java:69)
|
||||
at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:249)
|
||||
at org.apache.commons.logging.impl.SLF4JLogFactory.getInstance(SLF4JLogFactory.java:155)
|
||||
subsequent lines omitted...</pre>
|
||||
|
||||
|
||||
<p>As of SLF4J version 1.5.11, the code preempts the inevitable
|
||||
stack overflow error by throwing an exception with details about
|
||||
the actual cause of the problem. This is deemed to be better than
|
||||
leaving the user wondering about the reasons of the
|
||||
<code>StackOverflowError</code>.
|
||||
</p>
|
||||
|
||||
<p>For more background on this topic see <a
|
||||
href="legacy.html">Bridging legacy APIs</a>.
|
||||
</p>
|
||||
|
||||
<!-- ====================================================== -->
|
||||
|
||||
<h3>
|
||||
<a name="no_static_mdc_binder"
|
||||
href="#no_static_mdc_binder">Failed to load class
|
||||
|
|
|
|||
|
|
@ -101,10 +101,10 @@
|
|||
|
||||
<p>Please note that <em>jcl-over-slf4j.jar</em> and
|
||||
<em>slf4j-jcl.jar</em> cannot be deployed at the same time. The
|
||||
former jar file will cause JCL to delegate the choice of the logging
|
||||
system to SLF4J and the latter jar file will cause SLF4J to delegate
|
||||
the choice of the logging system to JCL, resulting in an infinite
|
||||
loop.
|
||||
former jar file will cause JCL to delegate the choice of the
|
||||
logging system to SLF4J and the latter jar file will cause SLF4J
|
||||
to delegate the choice of the logging system to JCL, resulting in
|
||||
an <a href="codes.html#jclDelegationLoop">infinite loop</a>.
|
||||
</p>
|
||||
|
||||
|
||||
|
|
@ -184,9 +184,10 @@
|
|||
<p>The presence of <em>slf4j-logj12.jar</em>, that is the log4j
|
||||
binding for SLF4J, will force all SLF4J calls to be delegated to
|
||||
log4j. The presence of <em>log4j-over-slf4j.jar</em> will in turn
|
||||
delegate all log4j API calls to their SLF4J equivalents. If both are
|
||||
present simultaneously, slf4j calls will be delegated to log4j, and
|
||||
log4j calls redirected to SLF4j, resulting in an endless loop.
|
||||
delegate all log4j API calls to their SLF4J equivalents. If both
|
||||
are present simultaneously, slf4j calls will be delegated to
|
||||
log4j, and log4j calls redirected to SLF4j, resulting in an <a
|
||||
href="codes.html#log4jDelegationLoop">endless loop</a>.
|
||||
</p>
|
||||
|
||||
<h3><a name="jul-to-slf4j" href="jul-to-slf4j">JUL to SLF4J</a></h3>
|
||||
|
|
|
|||
|
|
@ -27,7 +27,20 @@
|
|||
|
||||
<hr noshade="noshade" size="1"/>
|
||||
|
||||
<h3>March xx, 2010 - Release of SLF4J 1.5.11</h3>
|
||||
<h3>February 25th, 2010 - Release of SLF4J 1.5.11</h3>
|
||||
|
||||
|
||||
<p>Users yet unfamiliar with SLF4J sometimes unknowingly place both
|
||||
<em>log4j-over-slf4j.jar</em> and <em>slf4j-log4j12.jar</em>
|
||||
simultanously on the class path causing stack overflow
|
||||
errors. Simultaneously placing both <em>jcl-over-slf4j.jar</em> and
|
||||
<em>slf4j-jcl.jar</em> on the class path, is another occurrence of
|
||||
the same general problem. As of this version, SLF4J preempts the
|
||||
inevitable stack overflow error by throwing an exception with
|
||||
details about the actual cause of the problem. This is deemed to be
|
||||
better than leaving the user wondering about the reasons of the
|
||||
<code>StackOverflowError</code>.
|
||||
</p>
|
||||
|
||||
<p>Fixed <a href="http://bugzilla.slf4j.org/show_bug.cgi?id=168">bug
|
||||
168</a>. In case log4j-over-slf4j is used and a logback appender
|
||||
|
|
|
|||
Loading…
Reference in New Issue