OpenJPA
  1. OpenJPA
  2. OPENJPA-653

Concurrency issue with query cache enabled

    Details

    • Type: Bug Bug
    • Status: Closed
    • Priority: Major Major
    • Resolution: Fixed
    • Affects Version/s: 1.2.0
    • Fix Version/s: 1.2.0
    • Component/s: datacache
    • Labels:
      None

      Description

      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.

      1. OPENJPA-653.patch
        0.9 kB
        Jeremy Bauer

        Activity

        Jeremy Bauer created issue -
        Jeremy Bauer made changes -
        Field Original Value New Value
        Attachment OPENJPA-653.patch [ 12385412 ]
        Michael Dick made changes -
        Assignee Michael Dick [ mikedd ]
        Albert Lee made changes -
        Fix Version/s 1.2.0 [ 12313102 ]
        Resolution Fixed [ 1 ]
        Status Open [ 1 ] Resolved [ 5 ]
        Michael Dick made changes -
        Assignee Michael Dick [ mikedd ] Jeremy Bauer [ techhusky ]
        Donald Woods made changes -
        Status Resolved [ 5 ] Closed [ 6 ]

          People

          • Assignee:
            Jeremy Bauer
            Reporter:
            Jeremy Bauer
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            Dates

            • Created:
              Updated:
              Resolved:

              Development