Question

JMS Sender using Transactions within Weblogic

Asked by: nswartz

From within a transactional MDB I need to send a message on a JMS queue. I want this to be transactional, meaning that if the MDB gets an error, the message will never be sent. I also want to make sure that me DB updates are committed before any receiver has a chance to see the message
I set the session to be transacted, but I still think I see that messages are delivered before the DB commits.
Do I need to set "XA Connection Factory Enabled" on the queue connection factory?

Looking at the code below, I see that I explicitly call commit(). That might be my problem, but if I do not call commit(), will Weblogic do the commit for me when the MDB finishes?

QueueConnectionFactory queueConnectionFactory = (QueueConnectionFactory) destContext.lookup(cFactName);
Queue queue = (Queue) destContext.lookup(qName);
 
queueConnection = queueConnectionFactory.createQueueConnection();
QueueSession queueSession = QueueConnection.createQueueSession(useTransactedSession, Session.AUTO_ACKNOWLEDGE);
QueueSender queueSender = queueSession.createSender(queue);
TextMessage msg = queueSession.createTextMessage();
msg.setJMSCorrelationID(correlationId);
msg.setText(xml);
queueSender.send(msg);
if ( queueSession.getTransacted() ) {
		queueSession.commit();
}
queueSession.close();
queueConnection.close();

                                  
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Asked On
2009-09-02 at 06:51:01ID24701263
Tags

JTA

,

Weblogic

,

jms

,

transaction

,

connection-factory

Topics

Enterprise Java Beans (EJB)

,

BEA WebLogic Application Server

,

Java Programming Language

Participating Experts
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Comments
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Answers

 

by: rajesh_balaPosted on 2009-09-02 at 08:03:24ID: 25241788

You need to set the connection factory setting as XA enabled.

 

by: nswartzPosted on 2009-09-02 at 08:35:53ID: 25242175

If I set the factory as XA enabled, when does the message become available? Right after the session.commit() or when the MDB exits (and Weblogic does the commit)?

 

by: nswartzPosted on 2009-09-02 at 11:23:40ID: 25243988

We tried to set the connection factory as XA, but the message still goes out before the transaction commits.
From http://download-llnw.oracle.com/docs/cd/E11035_01/wls100/jms/trans.html
A JMS transacted session supports transactions that are located within the session. A JMS transacted sessions transaction will not have any effects outside of the session. For example, rolling back a session will roll back all sends and receives on that session, but will not roll back any database updates. JTA user transactions are ignored by JMS transacted sessions.

 

by: rajesh_balaPosted on 2009-09-02 at 18:17:28ID: 25247176

One more thing I observed was this..

queueConnection = queueConnectionFactory.createQueueConnection();


Shouldn't it be like the following to inform weblogic that, the session you are creating is transaction aware.

queueConnection  = queueConnectionFactory.createQueueSession(true, Session.AUTO_ACKNOWLEDGE);

Are you sure, it was entering the commit() if-loop earlier?

 

by: rajesh_balaPosted on 2009-09-02 at 18:26:09ID: 25247206

Ok, I went through the question again in more detail. Looks like you are having some MDB and performing some additional operations on that MDB. If you get an error, the queue shouldn't be sent a message (short explanation).

1. Let us roll back your XA setting in connection factory.
2. JMS transactions are possible in 3 different ways. One of them is to use MDB and you have chosen it.
3. If you want your MDB to participate in transaction, you need to make some changes in your deployment descriptor.

http://download-llnw.oracle.com/docs/cd/E13222_01/wls/docs90/ejb/message_beans.html

>>>

To configure container-level transaction management:
    Set the transaction-type element in the message-driven element in the ejb-jar.xml file to Container.
    Set the trans-attribute element in the container-transaction element in ejb-jar.xml to Required.

Note:  If transaction-type is set to Container, and trans-attribute is not set, the default transaction-attribute value (NotSupported for MDBs) is applied. WebLogic Server allows you to deploy the MDB, and logs a compliance error. However, if you make this configuration error, the MDB will not run transactionallyif a failure occurs mid-transaction, updates that occurred prior to the failure will not be rolled back.

So I guess you have missed to change trans-attribute and transaction-type in your descriptors. I would suggest you to apply this change in your descriptor and redeploy it.  It would be good if you could check for any errors in weblogic console and post it here.

 

by: nswartzPosted on 2009-09-02 at 19:09:41ID: 25247354

We already deployed the MDB as a transactional bean. It has been that way for a while.
We just need to include the message sending in the transaction,
We found the following
http://download.oracle.com/docs/cd/E13222_01/wls/docs90/jms/j2ee.html#1309905

Essentially, we need to set useTransactedSession to false and use an XA queue connection factory. This lets Weblogic manage the transactions for the queue instead of the session.
This appears to work.

Here is an excerpt from that site:

Sending a JMS Message In a J2EE Container

After you declare the JMS connection factory and destination resources in the deployment descriptors so that they are mapped to the java:comp/env JNDI tree, you can use them to send and/or receive JMS messages inside an EJB or a servlet.

For example, the following code fragment sends a message:

    InitialContext ic = new InitialContext();
    QueueConnectionFactory qcf =
     (QueueConnectionFactory)ic.lookup("java:comp/env/jms/QCF");
    Queue destQueue =
     (Queue)ic.lookup("java:comp/env/jms/TESTQUEUE");
    ic.close();
    QueueConnection connection = qcf.createQueueConnection();
    try {
     QueueSession session = connection.createQueueSession(0, false);
     QueueSender sender = session.createSender(destQueue);
     TextMessage msg = session.createTextMessage("This is a test");
     sender.send(msg);
    } finally {
     connection.close();
    }

Also, none of the transactional XA extensions to the JMS API are used in this code fragment. Instead, the container uses them internally if the JMS code is used inside a transaction context. But whether XA is used internally, the user-written code is the same, and does not use any JMS XA classes. This is what is specified by J2EE. Writing EJB code in this way enables you to run EJBs in an environment where transactions are present or in a non-transactional environment, just by changing the deployment descriptors.

20120131-EE-VQP-002

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