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  1. JBoss Enterprise Application Platform 4 and 5
  2. JBPAPP-7463 Upgrade JGroups to 2.6.22
  3. JBPAPP-7472

ConcurrentModificationException in BasicConnectionTable.retainAll

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Details

    • Sub-task
    • Resolution: Done
    • Major
    • EAP_EWP 5.2.0
    • EAP_EWP 5.1.2
    • Clustering
    • None
    • Release Notes
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      A race condition in JGroups could lead to a ConcurrentModificationException in the BasicConnectionTable.retainAll() call. The race condition occurred on the members variable when using the TCP protocol. The appropriate synchronization has been implemented to prevent concurrent access to the variable so that the ConcurrentModificationException can now no longer occur.
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      A race condition in JGroups could lead to a ConcurrentModificationException in the BasicConnectionTable.retainAll() call. The race condition occurred on the members variable when using the TCP protocol. The appropriate synchronization has been implemented to prevent concurrent access to the variable so that the ConcurrentModificationException can now no longer occur.
    • Documented as Resolved Issue
    • NEW

    Description

      java.util.ConcurrentModificationException
      at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
      at java.util.HashMap$KeyIterator.next(HashMap.java:828)
      at java.util.AbstractSet.removeAll(AbstractSet.java:154)
      at org.jgroups.blocks.BasicConnectionTable.retainAll(BasicConnectionTable.java:344)
      at org.jgroups.protocols.TCP.retainAll(TCP.java:59)
      at org.jgroups.protocols.BasicTCP.handleDownEvent(BasicTCP.java:265)
      at org.jgroups.protocols.TP.down(TP.java:1145)
      ...

      BasicTCP is missing a synchoronize on "members" when it passes it to TCP.retainAll.
      If members is modified by another thread (in TP.handleDownEvent) while BasicConnectionTable's Set.removeAll
      call is iterating over it, it triggers a ConcurrentModificationException.

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          is blocked by

          Bug - A problem that impairs or prevents the functions of the product. JGRP-1383 ConcurrentModificationException in BasicConnectionTable.retainAll

          • Major - To be worked after higher priority work items are addressed. When the severity is high and the effort to change it is low to moderate, this term is chosen. Issues in this category likely have an existing workaround but implementation or execution may be non-trivial.
          • Resolved

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              rhn-support-dereed Dennis Reed
              rhn-support-dereed Dennis Reed
              Eva Kopalova Eva Kopalova (Inactive)
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              Dates

                Created:
                Updated:
                Resolved: