What vendor specifc properties does JBossMQ provide?

As of 3.2.2 JBoss provides properties for scheduled delivery and redelivery control.

From org.jboss.mq.SpyMessage

....
   /**
      * JBoss-vendor specific property specifying redelivery delay of a message.
      * The message will be rescheduled for delivery from the time at which it
      * was unacknowledged, plus the given period.
      */
   public static final String PROPERTY_REDELIVERY_DELAY = "JMS_JBOSS_REDELIVERY_DELAY";

   /**
      * JBoss-vendor specific property for getting the count of redelivery
      * attempts of a message.
      */
   public static final String PROPERTY_REDELIVERY_COUNT = "JMS_JBOSS_REDELIVERY_COUNT";

   /**
      * JBoss-vendor specific property specifying the limit of redelivery
      * attempts of a message. The message will be redelivered a given number of
      * times. If not set, the container default is used.
      */
   public static final String PROPERTY_REDELIVERY_LIMIT = "JMS_JBOSS_REDELIVERY_LIMIT";
...

Usage

                 m.setJMSDeliveryMode(DeliveryMode.NON_PERSISTENT);

                 /* JBossMQ specific property - JMS_JBOSS_SCHEDULED_DELIVERY */
                 long ONE_HOUR_MILLIS = 15 * 60 * 1000;
                 long now = System.currentTimeMillis();
                 m.setLongProperty("JMS_JBOSS_SCHEDULED_DELIVERY", now + ONE_HOUR_MILLIS);

                  /* JBossMQ specific property - JMS_JBOSS_REDELIVERY_LIMIT */
                 m.setIntProperty("JMS_JBOSS_REDELIVERY_LIMIT", 10);

Two equivalent attributes may also be configurated on the destination: RedeliveryLimit and RedeliveryDelay.

Check out this wiki for details: Queue or Topic

NOTE If both the attributes on the destination and the property on the message are set, the ones on the message take precedence.

Why am I getting this exception and why is my message not sent to the DQL?

2007-01-25 13:50:13,794 ERROR [org.jboss.ejb.plugins.jms.DLQHandler] Could not send message to Dead Letter Queue
javax.jms.MessageFormatException: Invalid conversion
     at org.jboss.mq.SpyMessage.getIntProperty(SpyMessage.java:574)
     at org.jboss.ejb.plugins.jms.DLQHandler.handleRedeliveredMessage(DLQHandler.java:212)
     at org.jboss.ejb.plugins.jms.JMSContainerInvoker$MessageListenerImpl.onMessage(JMSContainerInvoker.java:1370)
     at org.jboss.jms.asf.StdServerSession.onMessage(StdServerSession.java:256)
     at org.jboss.mq.SpyMessageConsumer.sessionConsumerProcessMessage(SpyMessageConsumer.java:904)
     at org.jboss.mq.SpyMessageConsumer.addMessage(SpyMessageConsumer.java:160)
     at org.jboss.mq.SpySession.run(SpySession.java:333)
     at org.jboss.jms.asf.StdServerSession.run(StdServerSession.java:180)
     at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:743)

Answer

When you set properties on the SpyMessage object, you've got to use the appropriate type. For instance:

     m.setIntProperty("JMS_JBOSS_REDELIVERY_LIMIT", 10); --> VALID


     m.setLongProperty("JMS_JBOSS_REDELIVERY_LIMIT", 10); --> INVALID

Old Reference: Change Note describes the properties.