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https://issues.apache.org/jira/browse/LOG4J2-268?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ralph Goers resolved LOG4J2-268.
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Resolution: Fixed
Fix Version/s: 2.0-beta7
Fixed in revision 1487518. Please verify and close.
> Berkeley (persistent) agent for FlumeAppender only works with MapMessages
> (and thus not slf4j)
> ----------------------------------------------------------------------------------------------
>
> Key: LOG4J2-268
> URL: https://issues.apache.org/jira/browse/LOG4J2-268
> Project: Log4j 2
> Issue Type: Bug
> Components: Flume Appender
> Reporter: Edward Sargisson
> Fix For: 2.0-beta7
>
>
> If I try and use the persistent FlumeAppender with slf4j then I get a
> NullPointerException in FlumePersistentManager.send because there is no GUID
> header.
> (My repro here was using a copy of Flume modified to use log4j2 - while this
> particular repro is exotic I'm confident that the general case detailed above
> will be very common).
> There is no GUID header because the FlumeEvent constructor only creates one
> if the message is a MapMessage.
> If the user is using slf4j then all messages are PersistentMessages - and
> thus will cause this logging to fail.
> The GUID is required because it's used as a key in the BerkeleyDB storage.
> My attempts at a simple fix ran afoul of the key lookup from the headers in
> FlumePersisentManager.WriterThread.run().
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