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https://issues.apache.org/jira/browse/OPENJPA-1970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13014199#comment-13014199
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Ravi P Palacherla commented on OPENJPA-1970:
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Rick,
The only issue in including the test case is there is a chance of OutOfMemory.
The test case uses 10 threads out of which 6 threads continuously add elements
(1million) to TreeMap and 4 threads tries to retrieve the added elements.
So there is a chance that the test can run into OutOfMemory.
Even with the above setup Iam able to replicate the issue only on a dual core
machine and if the issue is reproduced 1 out of 10 runs.
I have a wrapper shell script that runs the same test 10 times and I always see
that one of these tests hang (CPU spin) at TreeMap.get.
Regarding running this test case on trunk, I did not encounter the issue on
trunk (using same wrapped shell script),
can not say that the issue does not exist in trunk but I did not see it happen
while running the same test case in trunk.
Regards,
Ravi.
> CPU spinning forever at TreeMap.get in Schema.java
> ---------------------------------------------------
>
> Key: OPENJPA-1970
> URL: https://issues.apache.org/jira/browse/OPENJPA-1970
> Project: OpenJPA
> Issue Type: Bug
> Components: jdbc
> Affects Versions: 1.1.1
> Environment: openJPA 1.1.x
> Reporter: Ravi P Palacherla
> Assignee: Ravi P Palacherla
> Fix For: 1.1.1
>
> Attachments: OPENJPA-1970.diff
>
>
> CPU is spinning forever at TreeMap.get in schema.java.
> The reason found to be because of structural modification of treemap outside
> a synchronized block.
> Synchronizing the treemap is fixing the issue.
> The issue can be reproduced with an openJPA test case but due to the nature
> of the problem, it is replicable intermittently on dual core machine.
> Attached patch has the test case and also the test case is ignored in default
> runs because it will cause the tests to stuck at TreeMap.get.
> This is seen in 1.1.x version of openJPA and hence uploading the patch only
> for that version.
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