I am new to JMS and MDB concepts and I need help with the following problem (server is WebLogic 702):
JMS producer sends a message to a queue. MDB receives a message and calls a session ejb method to process a file. Message should be sent only once. File is processed in such a way that a number of lines is parsed, validated and loaded into a table of the database. I don't know how to configure the transaction management attributes of the MDB and EJB. The EJB should have a Container managed transaction setting with Never or Not Supported attribute, because batches of file processing should not be inside a transaction. Any suggestion is highly appreciated.
Zlata

From http://www.theserverside.com/articles/article.tss?l=Pramati-MDB

What is a Message Driven Bean?
A message driven bean is a stateless, server-side, transaction-aware component that is driven by a Java message (javax.jms.message). It is invoked by the EJB Container when a message is received from a JMS Queue or Topic. It acts as a simple message listener.

You have to define the transaction attribute in the ejb-jar.xml as follows:

<container-transaction>
         <method>
           <ejb-name>PSsimpleMdb</ejb-name>
           <method-name>onMessage</method-name>
           <method-params>
             <method-param>javax.jms.Message</method-param>
           </method-params>
         </method>
         <trans-attribute>Required</trans-attribute>
       </container-transaction>

Only Required or NotSupported is supported with MDB

Here is a sample MDB application

http://www.oracle.com/technology/tech/java/oc4j/904/how_to/how-to-ejb-mdb.zip - Here is a sample MDB

Here is an article I wrote on MDB using JCAResource Adapter
http://www.onjava.com/pub/a/onjava/2004/06/23/mdbjca.html

Hope this helps

regards
Debu Panda
http://radio.weblogs.com/0135826

When would you use 'Not supported' for the transaction type?