[jbossts-issues] [JBoss JIRA] (JBTM-2614) JCA TransactionImporter should be thread safe
Michael Musgrove (JIRA)
issues at jboss.org
Tue Jan 26 07:25:00 EST 2016
Michael Musgrove created JBTM-2614:
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Summary: JCA TransactionImporter should be thread safe
Key: JBTM-2614
URL: https://issues.jboss.org/browse/JBTM-2614
Project: JBoss Transaction Manager
Issue Type: Bug
Components: JCA
Affects Versions: 5.2.12.Final
Reporter: Michael Musgrove
Assignee: Michael Musgrove
Fix For: 5.next
I have a unit test that shows there's a race condition (first observed by [~dmlloyd]) in com.arjuna.ats.internal.jta.transaction.arjunacore.jca.TransactionImporterImple#importTransaction(javax.transaction.xa.Xid, int).
If two threads call this method at the same time, two separate transaction objects may be created. Here's the sequence of events:
T1: call importTransaction for XID1
T2: call importTransaction for XID1
T1: getImportedTransaction returns null
T2: getImportedTransaction returns null
T1: create new transaction, add to map
T2: create new transaction, add to map (overwriting T1's)
There is nothing in the documentation to indicate that this is not a valid situation or that access to the TransactionImporter has to be single-threaded in any way.
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