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slf4j
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better error reporting when no bindign is available

This commit is contained in:
Ceki Gulcu 2007-05-04 15:43:02 +00:00
parent 6e94387df8
commit b7389a7e57
2 changed files with 16 additions and 1 deletions
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13
slf4j-api/src/main/java/org/slf4j/LoggerFactory.java
View File

@ -47,6 +47,9 @@ public final class LoggerFactory {
static ILoggerFactory loggerFactory;
static final String NO_STATICLOGGERBINDER_URL = "http://www.slf4j.org/codes.html#StaticLoggerBinder";
static final String NULL_LF_URL = "http://www.slf4j.org/codes.html#null_LF";
// private constructor prevents instantiation
private LoggerFactory() {
}
@ -55,6 +58,14 @@ public final class LoggerFactory {
static {
try {
loggerFactory = StaticLoggerBinder.SINGLETON.getLoggerFactory();
} catch(NoClassDefFoundError ncde) {
String msg = ncde.getMessage();
if(msg != null && msg.indexOf("org/slf4j/impl/StaticLoggerBinder") != -1) {
Util.reportFailure("Failed to load class \"org.slf4j.impl.StaticLoggerBinder\".");
Util.reportFailure("See "+NO_STATICLOGGERBINDER_URL+" for further details.");
}
throw ncde;
} catch (Exception e) {
// we should never get here
Util.reportFailure("Failed to instantiate logger ["
@ -72,7 +83,7 @@ public final class LoggerFactory {
*/
public static Logger getLogger(String name) {
if(loggerFactory == null) {
throw new IllegalStateException("Logging factory implementation cannot be null. See also http://www.slf4j.org/codes.html#null_LF");
throw new IllegalStateException("Logging factory implementation cannot be null. See also "+NULL_LF_URL);
}
return loggerFactory.getLogger(name);
}

4
slf4j-api/src/main/java/org/slf4j/helpers/Util.java
View File

@ -38,4 +38,8 @@ public class Util {
System.err.println("Reported exception:");
t.printStackTrace();
}
static final public void reportFailure(String msg) {
System.err.println("SLF4J: " +msg);
}
}