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From "Rick Curtis (JIRA)" <>
Subject [jira] Created: (OPENJPA-1168) NPE in UUIDGenerator.initializeForType1()
Date Wed, 08 Jul 2009 22:01:15 GMT
NPE in UUIDGenerator.initializeForType1()

                 Key: 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.

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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