[jira] [Created] (LOG4J2-2158) ThreadContext map is cleared => entries are only available for one log event

["Björn Kautler (JIRA)" <ji...@apache.org>]

Björn Kautler created LOG4J2-2158:
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             Summary: ThreadContext map is cleared => entries are only available for one log event
                 Key: LOG4J2-2158
                 URL: https://issues.apache.org/jira/browse/LOG4J2-2158
             Project: Log4j 2
          Issue Type: Bug
    Affects Versions: 2.10.0
            Reporter: Björn Kautler
            Priority: Critical


In {{org.apache.logging.log4j.core.impl.ThreadContextDataInjector.ForCopyOnWriteThreadContextMap.injectContextData}} without properties set, the result of {{ThreadContext.getThreadContextMap().getReadOnlyContextData()}} is returned which was saved in a variable called {{immutableCopy}}.

{{org.apache.logging.log4j.core.impl.ReusableLogEventFactory.createEvent}} calls {{result.clear()}} on that context data when the next log event is created.

Unfortunately the "immutable" copy is not immutable at all, but is cleared on the this call and all thread context map entries are lost.

If I set a {{Property}} on all loggers in the config, then the thread context map entries are not cleared, because the internal string map is not given out but the entries copied, but that property is also logged then of course.

If I instead set the system property {{log4j2.garbagefree.threadContextMap}}, the thread context map entries are also not cleared, as then also the entries are copied and not the internal structure given out.

From what I have seen, I'd say there is a {{immutableCopy.freeze()}} missing before the {{immutableCopy}} is returned inside the {{if}}-block.



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