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https://issues.apache.org/jira/browse/LOG4J2-416?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13796607#comment-13796607
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Dimitry Declercq commented on LOG4J2-416:
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Hi, sorry for the silence, I was on holidays and lost track of this issue...
Remko, you're right, this was indeed an application issue and has been fixed.
So for me everything is fine now.
Some food for thought: Would it be beneficial to add locking of the object to
LOG4J?
> 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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