Is log4j a reliable logging system?
No. log4j is not reliable. It is a best-effort fail-stop logging system. By fail-stop, we mean that log4j will not throw unexpected exceptions at run-time potentially causing your application to crash. If for any reason, log4j throws an uncaught exception, please send an email to the log4j-user@logging.apache.org mailing list. Uncaught exceptions are handled as serious bugs requiring immediate attention. Moreover, log4j will not revert to System.out or System.err when its designated output stream is not opened, is not writable or becomes full. This avoids corrupting an otherwise working program by flooding the user’s terminal because logging fails. However, log4j will output a single message to System.err indicating that logging can not be performed.
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