[ https://issues.apache.org/jira/browse/OPENJPA-1168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Michael Dick reassigned OPENJPA-1168:
-------------------------------------
Assignee: Michael Dick
> 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: Michael Dick
> 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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