[jira] [Resolved] (LOG4J2-1914) AsyncLogger and message formatting (ConcurrentModificationException)

["Remko Popma (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LOG4J2-1914?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Remko Popma resolved LOG4J2-1914.
---------------------------------
       Resolution: Fixed
    Fix Version/s: 2.9.1

Fixed in master.
I was able to add a test that reproduces the issue, and with the fix the exception no longer occurs.
Please verify and close.

> 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
>            Assignee: Remko Popma
>             Fix For: 2.9.1
>
>
> 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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