MDB Sender

[Marco Lombardo]

This topic is a little out of the SCBCD.
But i have a question on a MDB!!
How can i send a message from a client to a J2EE Server that have a MDB with a specified onMessage method?

Thanks
Marco

[Hong Anderson]

MDB can have only one onMessage method.
What do you mean specified?

[Roger Chung-Wee]

Every MDB type is associated with a particular Topic or Queue. When a client sends a JMS message, the server will allocate a correct MDB instance to service that request. In other words, an MDB is invisible to the client (which is why MDBs have no home or remote interfaces).

[Hong Anderson]

MDB has no client view (no home/component interface), therefore client cannot call MDB directly. Instead, client send message to JMS and JMS will deliver the message to MDB.
[ January 30, 2006: Message edited by: Kengkaj Sathianpantarit ]

[B.Sathish]

A JMS Topic or a queue is configured as a resource on the server under a JNDI name. A client has to do a JNDI look up to get a reference to a particular Topic or Queue and then post the message

[Marco Lombardo]

OK ...
One question.
There is a EJB Server S1 that register a Queue with a name MX and
there is a EJB Server S2 that register a Queue with the same name.
If I look up with the JNDI name MX, what happen??

[Hong Anderson]

Do you mean load balancing?
I think this depend on scheduler, it may get the referece from Server1 or Server2 up to the algorithm.