Fix Synchronization on Long could deadlock Reported by Findbugs
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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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