[logback-dev] [JIRA] Created: (LBCLASSIC-289) ConcurrentModificationException when using MDC

[Josh Oddman (JIRA)]

ConcurrentModificationException when using MDC
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                 Key: LBCLASSIC-289
                 URL: http://jira.qos.ch/browse/LBCLASSIC-289
             Project: logback-classic
          Issue Type: Bug
          Components: appender
    Affects Versions: 0.9.29
         Environment: Java HotSpot(TM) 64-Bit Server VM (build 20.1-b02-383, mixed mode)
Darwin aden 11.1.0 Darwin Kernel Version 11.1.0: Tue Jul 26 16:07:11 PDT 2011; root:xnu-1699.22.81~1/RELEASE_X86_64 x86_64
            Reporter: Josh Oddman
            Assignee: Logback dev list


In some rare cases in multithreaded environment MDC.put throws ConcurrentModificationException.

java.util.ConcurrentModificationException: null 
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793) ~[na:1.6.0_26] 
        at java.util.HashMap$EntryIterator.next(HashMap.java:834) ~[na:1.6.0_26] 
        at java.util.HashMap$EntryIterator.next(HashMap.java:832) ~[na:1.6.0_26] 
        at java.util.HashMap.putAll(HashMap.java:523) ~[na:1.6.0_26] 
        at ch.qos.logback.classic.util.LogbackMDCAdapter.duplicateAndInsertNewMap(LogbackMDCAdapter.java:69) 
~[logback-classic-0.9.29.jar:na] 
        at ch.qos.logback.classic.util.LogbackMDCAdapter.put(LogbackMDCAdapter.java:95) 
~[logback-classic-0.9.29.jar:na] 
        at org.slf4j.MDC.put(MDC.java:112) ~[slf4j-api-1.6.1.jar:1.6.1] 

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