[seam-issues] [JBoss JIRA] (JBSEAM-5078) Unsynchronized access to conversation entries map

Thu Feb 21 08:45:56 EST 2013

Vsevolod Golovanov created JBSEAM-5078:
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             Summary: Unsynchronized access to conversation entries map
                 Key: JBSEAM-5078
                 URL: https://issues.jboss.org/browse/JBSEAM-5078
             Project: Seam 2
          Issue Type: Feature Request
          Components: Core
    Affects Versions: 2.3.0.Final
            Reporter: Vsevolod Golovanov

The methods org.jboss.seam.core.ConversationEntries.getConversationEntries() and org.jboss.seam.core.ConversationEntries.getConversationIds() themselves are synchronized, but they still return views of underlying unsynchronized collection, so iterating over such a view could yield ConcurrentModificationException or incorrect results, if the underlying collection is changed at the same time.

Example stack:
2013-01-22 10:29:53,862 ERROR [ContainerBase] Session event listener threw exception
java.util.ConcurrentModificationException
	at java.util.HashMap$AbstractMapIterator.checkConcurrentMod(HashMap.java:193)
	at java.util.HashMap$AbstractMapIterator.makeNext(HashMap.java:198)
	at java.util.HashMap$KeyIterator.next(HashMap.java:271)
	at java.util.Collections$UnmodifiableCollection$1.next(Collections.java:1017)
	at org.jboss.seam.contexts.Lifecycle.endSession(Lifecycle.java:284)

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