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  1. OpenJPA
  2. OPENJPA-2507

Weird EmptyStackException in CriteriaQueryImpl



    • Type: Bug
    • Status: Closed
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: 2.2.0, 2.3.0, 2.4.0
    • Fix Version/s: 2.4.0
    • Component/s: criteria
    • Environment:
      openjpa 2.2.0 & 2.3.0, spring-data-jpa up to 1.4.2


      Using spring-data-jpa with openjpa, I sometimes encounter a strange error (not all the times, but under heavy load it makes its appearance, sparsely though):
      Caused by: java.util.EmptyStackException
      at java.util.Stack.peek(Stack.java:<arbitrary line>)
      at org.apache.openjpa.persistence.criteria.CriteriaQueryImpl.ctx(CriteriaQueryImpl.java:<arbitrary line>

      I do not know which behaviour triggers it, however I think it would be an improvement to change (I did not know where exactly to file it, because it is both an improvement and a bug in my opinion), in org.apache.openjpa.persistence.criteria.CriteriaQueryImpl, method: Context ctx(), this:
      return _contexts == null || _contexts.isEmpty() ? null : _contexts.peek();
      to something like this:
      try {
      return _contexts == null || _contexts.isEmpty() ? null : _contexts.peek();
      } catch (EmptyStackException e) {
      return null;

      , in order to prevent a case where multiple threads modify the "_contexts" between the evaluation of the inline "if".

      I am not able to reproduce it all the time, thus I can't create a useful test, neither have I created a patch due to the simplicity of the 'fix'. However I believe it is a harmless fix which could be considered a minor improvement.


        1. exceptions.txt
          16 kB
          David Bilge
        2. OPENJPA-2507-Wrap-ContextStack-in-ThreadLocal.patch
          3 kB
          Thomas Darimont
        3. openjpa-exception-demo.zip
          7 kB
          David Bilge

          Issue Links



              • Assignee:
                kwsutter Kevin W. Sutter
                ialex Ioannis Alexandrakis
              • Votes:
                1 Vote for this issue
                6 Start watching this issue


                • Created: