NPE in OptimisticMapWrapper on concurrent commit and rollback
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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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