Hi, I have the following problem: I have a MDB (EJB 3.0 on AS: 4.0.5.GA) that consumes messages from a queue. In the onMessage method I am calling the method of a Stateless Session Bean (injected with SEAM-mechanism). | public void onMessage( Message msg ) | { | | // extract userId and type from msg - both string variable | try{ | this.requestManager.insert(userId, type) // stateless session bean injected with seam | catch ( JMSException e ){ | e.printStackTrace(); | } | } | The insert Method is as follows: | public void insertPemRequest( String userId, String type ) | { | Person person = new Person( userId, type ); | try | { | this.entityManager.persist( examRequest ); | this.entityManager.flush(); | | // create business process in jbpm | } | catch ( ConstraintViolationException exp ){ | // do nothing, i.e do not kick off new business process | } | catch ( EntityExistsException entityEx ) { | // do nothing, i.e do not kick off new business process | } | } | The Person Bean has unique constraint on userId and type: i.e: | @Entity | @Table( uniqueConstraints= {@UniqueConstraint(columnNames={"userId", "type"}) } ) | public class Person { | // ---- getter/setter for id, name, type | } | By catching the EntityExistsException I want to avoid that a business process is kicked off twice for the same person and type. As there might be many messages send and consumed in parallel all requesting to kick off a business process for one person and type combination - this is a good way to control that a business process is kicked off once and once only for a name/type combination. Now my problem: The message is still redelivered and send to the DLQ, altough I caught the EntityExistsException. All other exceptions should lead to sending the message to DLQ. But not the EntityExistsException as this is a "tolerated" exception. I know from FAQ anonymous wrote : | What type of Exceptions should an MDB throw? | The quick answer is none. | But I am catching the exception. right? Or is this correct behaviour and I have to change my design that no EntityExistsException is thrown? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4053862#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...