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https://issues.apache.org/jira/browse/LOG4J2-416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13793573#comment-13793573
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Remko Popma commented on LOG4J2-416:
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Dimitry, anyone else, what is your thinking on this?
I am unsure how to make progress with this ticket.
> ConcurrentModificationException when logging maps that are being worked on
> --------------------------------------------------------------------------
>
> Key: LOG4J2-416
> URL: https://issues.apache.org/jira/browse/LOG4J2-416
> Project: Log4j 2
> Issue Type: Bug
> Components: API
> Affects Versions: 2.0-beta9
> Reporter: Dimitry Declercq
>
> We run a multi-thread application which logs Maps, after log.debug(map) we
> continue to add items to the map, resulting in a
> ConcurrentModificationException on the logging side.
> e.g
> thread1 adds 4 items to the map
> thread1 logs the map
> thread2 receives map and adds 2 extra items
> thread2 logs the map as well (not needed to trigger this issue)
> The logging of the map in thread 1 will sometimes fail with a
> ConcurrentModificationException.
> This is solved by logging a copy instead of the working variable, but I think
> it would be good if Log4J does this out of the box
> Stacktrace:
> Exception in thread "Thread-38" java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
> at java.util.HashMap$EntryIterator.next(HashMap.java:934)
> at java.util.HashMap$EntryIterator.next(HashMap.java:932)
> at
> org.apache.logging.log4j.message.ParameterizedMessage.recursiveDeepToString(ParameterizedMessage.java:463)
> at
> org.apache.logging.log4j.message.ParameterizedMessage.deepToString(ParameterizedMessage.java:378)
> at
> org.apache.logging.log4j.message.ParameterizedMessage.parseArguments(ParameterizedMessage.java:164)
> at
> org.apache.logging.log4j.message.ParameterizedMessage.<init>(ParameterizedMessage.java:117)
> at
> org.apache.logging.log4j.message.ParameterizedMessage.<init>(ParameterizedMessage.java:126)
> at org.slf4j.impl.SLF4JLogger.debug(SLF4JLogger.java:145)
> at
> com.lynx.api.rest.service.PriceResource.getPrice(PriceResource.java:74)
> at
> com.lynx.api.rest.service.PriceResourceTest$1.run(PriceResourceTest.java:166)
> at java.lang.Thread.run(Thread.java:722)
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