MDB listening on AQ.

Question

I have written a message driven bean that listens on an Oracle AQ. In v9.0.2 of OC4J I had a number of problems (e.g. the MDB would wait 240 seconds before accepting a second message, and the queue working in a LIFO way instead of a FIFO way). However, the developers preview (v9.0.3) of OC4J has fixed these 2 problems but introduced another. Now my messages never get dequeued from my AQ (they did in v9.0.2). Has anyone else encountered a similar problem using a MDB on Oracle AQs and v9.0.3 of OC4J?
Thanks,
Stephen Weatherly

Answer 1

Thanks for the reply, my MDB is transacted. In OC4J v9.0.3 my messages simply do not get dequeued when my MDB finishes it's processing. My MDB code runs and does what is expected, however, any messages delivered to it from the queue are not being automatically dequeued. In OC4J v9.0.2 after my MDB's code had finished successfully then the message would be dequeued by whatever process manages the delivering the message to the MDB, however in OC4J v9.0.3 this does not seem to happen. After my MDB has run the message remains on the queue. If I then restart the OC4J server then I receive the message again even though my MDB sucessfully processed the message the first time.
My MDB code is as follows:
package mdb;
import javax.ejb.*;
import javax.jms.*;
import javax.naming.*;
import java.util.*;
public class MessageLogger implements MessageDrivenBean
private final static int sleepTotal = 10 ;
private MessageDrivenContext messageContext;
public void ejbCreate()
System.out.println("MessageLogger.ejbCreate()");
public void onMessage(Message message)
System.out.println("Received message: " + message + " at " + new java.util.Date());
try
     oracle.jms.AQjmsTextMessage oracleMessage = (oracle.jms.AQjmsTextMessage) message;     
     System.out.println("MessageLogger.onMessage() : " + oracleMessage.getText() );
//System.out.println("MessageLogger.onMessage() : " + message.getStringProperty("subject") + " " + message.getStringProperty("message"));
System.out.println("Sleeping...");
int sleepCount =0;
while (sleepCount < sleepTotal)
System.out.println("Sleeping: " + (1+(sleepCount++)) + " / " + sleepTotal );
try
Thread.sleep(1000);
catch (Exception e)
catch(Exception e)
throw new EJBException(e);
public void ejbRemove()
System.out.println("MessageLogger.ejbRemove()");
public void setMessageDrivenContext(MessageDrivenContext context)
this.messageContext = context;
My ejb-jar.xml looks like:
<?xml version="1.0"?>
<!DOCTYPE ejb-jar PUBLIC "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 1.1//EN" "http://java.sun.com/j2ee/dtds/ejb-jar_1_1.dtd">
<ejb-jar>
     <description>A How-To demonstrating Message-Driven Beans</description>
     <enterprise-beans>
          <message-driven>
               <description></description>
               <ejb-name>MessageLogger</ejb-name>
               <ejb-class>mdb.MessageLogger</ejb-class>
               <message-driven-destination>
                    <destination-type>javax.jms.Queue</destination-type>
               </message-driven-destination>
          </message-driven>
     </enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>MessageLogger</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>
</assembly-descriptor>
</ejb-jar>
My orion-ejb-jar.xml looks as follows:
<?xml version="1.0"?>
<!DOCTYPE orion-ejb-jar PUBLIC "-//Evermind//DTD Enterprise JavaBeans 1.1 runtime//EN" "http://xmlns.oracle.com/ias/dtds/orion-ejb-jar.dtd">
<orion-ejb-jar>
     <enterprise-beans>
          <message-driven-deployment name="MessageLogger"
destination-location="java:comp/resource/RUB4/Queues/AQ.JMS_queue_1"
connection-factory-location="java:comp/resource/RUB4/QueueConnectionFactories/JMS_Queue_CF"
max-instances="1">
          </message-driven-deployment>
     </enterprise-beans>
     <assembly-descriptor>
     </assembly-descriptor>
</orion-ejb-jar>
And I have the following resource provider set up in my OC4J applications.xml file:
<resource-provider class="oracle.jms.OjmsContext" name="RUB4">
<description>Access to RUB4 database rubick</description>
<property name="url" value="jdbc:oracle:thin:aq/aq@rubick:1521:RUB4" />
<property name="username" value="aq" />
<property name="password" value="aq" />
</resource-provider>
Thanks for any assistence,
Steve