NPE in UUIDGenerator.initializeForType1()
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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
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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