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IntegratorWMB · Posted: Fri Jan 09, 2009 6:43 am Post subject: XA issues

Hi,

We have our own Enterprise app framework and it has a Transaction service which acts a wrapper for all transaction client request to JOTM transaction manager. most of our transaction falls in to one of these catagories:

a) xa start - db[1] update ....db[n] update - xa end
b) xa start - db[1] update - MQ send - db[2] update -xa end

The above scenarios working fine.

Now we are seeing issue with the following scenario

a) xa start - db[1] update - MQserver1 Q1 snd - MQserver1 Q2 snd - db[2] update - xa end

After MQserver1 Q1 snd the system seems to hang. Debugging shows the code hangs when we try to enlist the MQ server Q2 XA Resource with the Transaction manager (JOTM). Is this because both the queues are on the same physical MQ Server..

When I remove the enlist part for MQ Server Q2 ...the code fails trying to send the message with SYNCPOINT_NOT_AVAILABLE for Q2., when I ran the test for only one queue as part of XA, it works for both the queues. Here is the sample test code :

----
Jotm jotm = new Jotm(true, false);
TransactionManager tm = jotm.getTransactionManager();
XAResource mqXAResource1;
XAResource mqXAResource2;

Get the connection factory ....

XAConnection connection1 = connectionFactory.createXAConnection();
XASession session1 = connection1.createXASession();
mqXAResource1 = session1.getXAResource();

XAConnection connection2 = connectionFactory.createXAConnection();
XASession session2 = connection2.createXASession();
mqXAResource2 = session2.getXAResource();

connection1.start();
connection2.start();

MessageProducer producer1 = session1.getSession().createProducer(sndDest1);

MessageProducer producer2 = session2.getSession().createProducer(sndDest2);

tm.begin();
tm.getTransaction().enlistResource(mqXAResource1);
// Note: If the following line is uncommented code hangs here
tm.getTransaction().enlistResource(mqXAResource2);

producer1.send(session.createTextMessage("MESSAGE1"));

//If enlisting code above was commented the following line
// throws Completion Code 2, Reason 2072 error
producer2.send(session.createTextMessage("MESSAGE2"));

tm.getTransaction().delistResource(mqXAResource1, XAResource.TMSUCCESS);
tm.getTransaction().delistResource(mqXAResource2, XAResource.TMSUCCESS);

tm.commit();

// .... stop..close() for producers, sessions & connection done here

Any pointers appreciated.

Thanks.