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From "Carlin Rogers (JIRA)" <beehive-...@incubator.apache.org>
Subject [jira] Created: (BEEHIVE-779) ScopedRequestImpl.restoreAttributes() should not point the ScopedAttributeContainer at the Session's stored attribute HashMap instance
Date Wed, 01 Jun 2005 18:20:52 GMT
ScopedRequestImpl.restoreAttributes() should not point the ScopedAttributeContainer at the
Session's stored attribute HashMap instance
--------------------------------------------------------------------------------------------------------------------------------------

         Key: BEEHIVE-779
         URL: http://issues.apache.org/jira/browse/BEEHIVE-779
     Project: Beehive
        Type: Bug
    Versions: V1    
    Reporter: Carlin Rogers
 Assigned to: Carlin Rogers 
     Fix For: TBD


Currently the ScopedRequestImpl.restoreAttributes() assigns the 
ScopedAttributeContainer with the Session's stored attribute HashMap instance.
If there are multiple requests to the server in very fast succession, 
this will cause the use of the HashMap iterator to throw a
ConcurrentModificationException.

The problem is that during both restoreAttributes() and persistAttributes()
we are updating the session's instance of a HashMap. At the same time,
in persisAttributes() the call to the ScopedAttributeContainer's
getSerializableAttrs() uses the HashMap instance iterator 
(HashMap.HashIterator). If between calls to next() for the next 
MapEntry, and the number of elements in the Map gets altered,
we get the ConcurrentModificationException...

java.util.ConcurrentModificationException
    at java.util.HashMap$HashIterator.nextEntry()Ljava.util.HashMap$Entry;(Unknown Source)
    at java.util.HashMap$EntryIterator.next()Ljava.util.Map$Entry;(Unknown Source)
    at java.util.HashMap$EntryIterator.next()Ljava.lang.Object;(Unknown Source)
    at org.apache.beehive.netui.pageflow.scoping.internal.AttributeContainer.getSerializableAttrs(AttributeContainer.java:91)
    at org.apache.beehive.netui.pageflow.scoping.internal.ScopedRequestImpl.persistAttributes(ScopedRequestImpl.java:444)


I will take this one and submit a patch for the committers.

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