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From "Jerry Cwiklik (JIRA)" <...@uima.apache.org>
Subject [jira] Created: (UIMA-1986) Fix Synchronization on Long could deadlock Reported by Findbugs
Date Tue, 04 Jan 2011 18:51:46 GMT
Fix Synchronization on Long could deadlock Reported by Findbugs
---------------------------------------------------------------

                 Key: UIMA-1986
                 URL: https://issues.apache.org/jira/browse/UIMA-1986
             Project: UIMA
          Issue Type: Bug
          Components: Async Scaleout
    Affects Versions: 2.3.1AS
            Reporter: Jerry Cwiklik
            Assignee: Jerry Cwiklik


Local class StackDumpTimer in PrimitiveAnalysisEngineController_impl  is synchronizing a block
of code using a primitive (Long) which is not a good idea.
Finbugs documentation on this bug says:

"DL: Synchronization on boxed primitive could lead to deadlock (DL_SYNCHRONIZATION_ON_BOXED_PRIMITIVE)

The code synchronizes on a boxed primitive constant, such as an Integer.

private static Integer count = 0;
...
  synchronized(count) { 
     count++;
     }
...
Since Integer objects can be cached and shared, this code could be synchronizing on the same
object as other, unrelated code, leading to unresponsiveness and possible deadlock"



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