Deadlock in Apache log4j

Solution Verified - Updated

Environment

  • JBoss Enterprise Application Platform
    • 4.3.x
    • 5.x

Issue

  • Thread dump shows a deadlock involving log4j org.apache.log4j.spi.RootLogger.

Resolution

Replace the AsyncAppender with a FileAppender. See the following document for how to do this on JBoss EAP: How do I replace the AsyncAppender with a FileAppender on JBoss?

Root Cause

The AsyncAppender is known to cause performance issues and deadlocks in some situations.

Diagnostic Steps

Check the stack trace for AsyncAppender use.

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