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https://issues.apache.org/jira/browse/LOG4J2-1914?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16019995#comment-16019995
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Leon Finker commented on LOG4J2-1914:
-------------------------------------
Hi Gary,
Tried with 2.8.2 and same exception. It's hard to find the actual place though
that's causing it on the caller's thread.
> AsyncLogger and message formatting (ConcurrentModificationException)
> --------------------------------------------------------------------
>
> Key: LOG4J2-1914
> URL: https://issues.apache.org/jira/browse/LOG4J2-1914
> Project: Log4j 2
> Issue Type: Bug
> Affects Versions: 2.7
> Reporter: Leon Finker
>
> Hi,
> The docs specify that the default for log4j.format.msg.async is false. But we
> still got the following log4j2 AsyncLogger processing exception. Does it mean
> that message formatting is async or maybe async up to 2.7 only? Or is this
> something else? Thank you
> 2017-05-18 08:02:44,570 Log4j2-TF-3-AsyncLoggerConfig-2 ERROR An exception
> occurred processing Appender AppLogFile
> java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextNode(Unknown Source)
> at java.util.HashMap$EntryIterator.next(Unknown Source)
> at java.util.HashMap$EntryIterator.next(Unknown Source)
> at
> org.apache.logging.log4j.message.ParameterFormatter.appendMap(ParameterFormatter.java:569)
> at
> org.apache.logging.log4j.message.ParameterFormatter.appendPotentiallyRecursiveValue(ParameterFormatter.java:505)
> at
> org.apache.logging.log4j.message.ParameterFormatter.recursiveDeepToString(ParameterFormatter.java:432)
> at
> org.apache.logging.log4j.message.ParameterFormatter.formatMessage2(ParameterFormatter.java:189)
> at
> org.apache.logging.log4j.message.ParameterizedMessage.formatTo(ParameterizedMessage.java:225)
> at
> org.apache.logging.log4j.core.pattern.MessagePatternConverter.format(MessagePatternConverter.java:117)
> at
> org.apache.logging.log4j.core.pattern.PatternFormatter.format(PatternFormatter.java:38)
> at
> org.apache.logging.log4j.core.layout.PatternLayout$PatternSerializer.toSerializable(PatternLayout.java:294)
> at
> org.apache.logging.log4j.core.layout.PatternLayout.toText(PatternLayout.java:195)
> at
> org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:180)
> at
> org.apache.logging.log4j.core.layout.PatternLayout.encode(PatternLayout.java:57)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.directEncodeEvent(AbstractOutputStreamAppender.java:176)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.tryAppend(AbstractOutputStreamAppender.java:169)
> at
> org.apache.logging.log4j.core.appender.AbstractOutputStreamAppender.append(AbstractOutputStreamAppender.java:160)
> at
> org.apache.logging.log4j.core.appender.RollingRandomAccessFileAppender.append(RollingRandomAccessFileAppender.java:104)
> at
> org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
> at
> org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
> at
> org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:447)
> at
> org.apache.logging.log4j.core.async.AsyncLoggerConfig.asyncCallAppenders(AsyncLoggerConfig.java:114)
> at
> org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor$Log4jEventWrapperHandler.onEvent(AsyncLoggerConfigDisruptor.java:112)
> at
> org.apache.logging.log4j.core.async.AsyncLoggerConfigDisruptor$Log4jEventWrapperHandler.onEvent(AsyncLoggerConfigDisruptor.java:98)
> at
> com.lmax.disruptor.BatchEventProcessor.run(BatchEventProcessor.java:129)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
> Source)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
> Source)
> at java.lang.Thread.run(Unknown Source)
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