[JBoss JIRA] Created: (JBTM-770) incorrect cleanup registration causes memory leak
by Jonathan Halliday (JIRA)
incorrect cleanup registration causes memory leak
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Key: JBTM-770
URL: https://jira.jboss.org/browse/JBTM-770
Project: JBoss Transaction Manager
Issue Type: Bug
Security Level: Public (Everyone can see)
Components: JTS
Affects Versions: 4.6.1.CP06, 4.12.0
Reporter: Jonathan Halliday
Assignee: Mark Little
Fix For: 4.13.0, 4.6.1.CP08
jts.TransactionImple constructors attempt to optimize the cleanup callback needed to remove entries from _transactions, bypassing the ORB for interposition scenarios:
theTx = (TwoPhaseCoordinator) BasicAction.Current();
if (theTx != null) {
theTx.addSynchronization(new LocalCleanupSynchronization(this));
} else {
registerSynchronization(new CleanupSynchronization(this));
}
Unfortunately this does not work and leads to memory leaks on _transactions in certain cases. Specifically, where theTx is a ServerTransaction (i.e. extends ArjunaTransactionImple, which extends TwoPhaseCoordinator), the callbacks run (by ArjunaTransactionImple.do[Before|After]Completion()) are those in ArjunaTransactionImple._syncs, not the masked ones in TwoPhaseCoordinator._syncs. Thus using TwoPhaseCoordinator.addSynchronization registers a callback which is never invoked.
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