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https://issues.apache.org/jira/browse/OPENJPA-1168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Curtis updated OPENJPA-1168:
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Attachment: OPENJPA-1168.patch
The patch includes a test case and the fix for this issue.
Since this bug is a timing window, running this test case against an un-patched
tree may work from time to time. Please let me know if you want me to post some
more information in the test case about why I did what I did.
- Rick
> NPE in UUIDGenerator.initializeForType1()
> -----------------------------------------
>
> Key: OPENJPA-1168
> URL: https://issues.apache.org/jira/browse/OPENJPA-1168
> Project: OpenJPA
> Issue Type: Bug
> Components: lib
> Reporter: Rick Curtis
> Assignee: Rick Curtis
> Fix For: 1.3.0, 2.0.0
>
> Attachments: OPENJPA-1168.patch
>
>
> When UUIDGenerator.createType1() is called by more than one thread at
> *nearly* the same time AND UUIDGenerator.createType1() wasn't called
> previously, a small timing window exists where a NPE will result.
> Scenario:
> Thread 1 calls UUIDGenerator.createType1() and RANDOM == null so
> initializeForType1() is called. While that thread is in initializeForType1(),
> it sets the static variable RANDOM so that value is no longer null. Now
> Thread 2 calls UUIDGenerator.createType1() and RANDOM is no longer null, so
> it proceeds to the call System.arraycopy(IP, 0, uuid, 10, IP.length);. At
> this point Thread 1 hasn't got to initializing IP yet, so Thread 2 gets hits
> a NPE.
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