Dimitry Declercq created LOG4J2-416:
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Summary: 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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