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From "Jeremy Bauer (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-653) Concurrency issue with query cache enabled
Date Mon, 07 Jul 2008 14:15:31 GMT
Concurrency issue with query cache enabled
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                 Key: OPENJPA-653
                 URL: https://issues.apache.org/jira/browse/OPENJPA-653
             Project: OpenJPA
          Issue Type: Bug
          Components: datacache
    Affects Versions: 1.2.0
            Reporter: Jeremy Bauer


A Java EE application with query result caching enabled and with many concurrent users is
failing with a ConcurrentModificationException in org.apache.openjpa.datacache.QueryCacheStoreQuery.
 Specifically, the failure is in the inner class.method CachingResultObjectProvider.checkFinished(Object,
boolean) and occurs while iterating the _data TreeMap within the QueryResult constructor.
 

Examination of this method showed that the tree map is synchronized in the beginning of the
method and then later when the  map is cleared in abortCaching().  It is not synchronized
when a new QueryResult is constructed.  This allows a thread to iterate over the map (during
the constructor) while another thread is modifying it.  

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