The FAQ says,
If for any reason, log4j throws an uncaught exception, please send
an email to the [email protected] mailing list.
Ok. log4j does not trap exceptions thrown by appenders. You can
reproduce under apache-log4j-1.2.16 with this simple appender:
import org.apache.log4j.*;
import org.apache.log4j.spi.*;
public static class MyAppender extends AppenderSkeleton {
public void append(LoggingEvent e) {
throw new RuntimeException("catch me!");
}
public boolean requiresLayout() { return true; }
public void close() { }
}
The exception:
Exception in thread "main" java.lang.RuntimeException: catch me!
at MyAppender.append(MyAppender.java:6)
at
org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
at
org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)
at org.apache.log4j.Category.callAppenders(Category.java:206)
at org.apache.log4j.Category.forcedLog(Category.java:391)
at org.apache.log4j.Category.warn(Category.java:1043)
at Log4jTry.main(Log4jTry.java:20)
log4j should catch errors from appenders. (Or, it should not call
itself fail-stop. Or, it should not call itself extensible.)
Andrew
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