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  1. JGroups
  2. JGRP-1286

ConcurrentModificationException encountered when starting JGroups 2.12RC1 when diagnostics is enabled

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: Major Major
    • 2.12
    • 2.12
    • None
    • Workaround Exists
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      If you run with enable_diagnostics=false then this will never be seen. However the default for protocols is to be enabled.

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      If you run with enable_diagnostics=false then this will never be seen. However the default for protocols is to be enabled.
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      Unfortunately this is nondeterministic and I have only been able to reproduce it once. It can happen with any protocol with enable_diagnostics=true

      As far as I can tell the channel will still work as desired, except for some diagnostic features will not work correctly and the stack trace is shown, which can scare users.

      Show
      Unfortunately this is nondeterministic and I have only been able to reproduce it once. It can happen with any protocol with enable_diagnostics=true As far as I can tell the channel will still work as desired, except for some diagnostic features will not work correctly and the stack trace is shown, which can scare users.

      I saw this error once when starting up my server using the default TCP.xml file. I have not been able to reproduce it more than once.
      I just wanted to submit this so that the handlers object can be properly protected via synchronization or java.util.concurrent related facility.

      48 E 15:55:19,696 (TCP ) failure handling diagnostics request java.util.ConcurrentModificationException
      at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
      at java.util.HashMap$KeyIterator.next(Unknown Source)
      at org.jgroups.protocols.TP$DiagnosticsHandler.handleDiagnosticProbe(TP.java:2157)
      at org.jgroups.protocols.TP$DiagnosticsHandler.run(TP.java:2130)
      at java.lang.Thread.run(Unknown Source)

              rhn-engineering-bban Bela Ban
              rpwburns William Burns (Inactive)
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                Created:
                Updated:
                Resolved: