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https://issues.apache.org/jira/browse/TRANSACTION-29?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12620006#action_12620006
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Luciano Leggieri commented on TRANSACTION-29:
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Hello,
I reproduced the steps, but couldn't get a NPE. Does it always happen? Maybe it
is already solved?
> NPE in OptimisticMapWrapper on concurrent commit and rollback
> -------------------------------------------------------------
>
> Key: TRANSACTION-29
> URL: https://issues.apache.org/jira/browse/TRANSACTION-29
> Project: Commons Transaction
> Issue Type: Bug
> Affects Versions: 1.3
> Environment: Revision: 650440
> Reporter: Martijn Hendriks
>
> When multiple transactions for an OptimisticMapWrapper are concurrently
> executing, a NPE can be thrown if one transaction is committed and one is
> rolled back. This can be reproduced with the following code (based on
> testMulti in the OptimisticMapWrapperTest class):
> final Map map1 = new HashMap();
> final OptimisticMapWrapper txMap1 = (OptimisticMapWrapper)
> getNewWrapper(map1);
> Thread thread1 = new Thread(new Runnable() {
> public void run() {
> txMap1.startTransaction();
> txMap1.put("key1", "value2");
> txMap1.commitTransaction();
> }
> }, "Thread1");
> txMap1.put("key1", "value1");
> txMap1.startTransaction();
> thread1.start();
> txMap1.rollbackTransaction();
> * Set breakpoints at line 363 and 137 in OptimisticMapWrapper
> * Run the code above with the debugger attached
> * Step through the dispose method (release the lock)
> * Continue the other thread; it will give the NPE
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