[jboss-jira] [JBoss JIRA] (JGRP-1383) ConcurrentModificationException in BasicConnectionTable.retainAll

[Dennis Reed (Created) (JIRA)]

ConcurrentModificationException in BasicConnectionTable.retainAll
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                 Key: JGRP-1383
                 URL: https://issues.jboss.org/browse/JGRP-1383
             Project: JGroups
          Issue Type: Bug
    Affects Versions: 2.6.20
            Reporter: Dennis Reed
            Assignee: Dennis Reed
             Fix For: 2.6.21


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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