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JavaRanch » Java Forums » Certification » EJB Certification (SCBCD/OCPJBCD)
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Message Driven Bean...

ankur rathi
Ranch Hand

Joined: Oct 11, 2004
Posts: 3830
What are the message driven bean???

Is there some more bean also that comes under EJBs.

Thanks a lot.
Rudy Harianto
Ranch Hand

Joined: Dec 01, 2003
Posts: 94
Yes, MDB is one type of EJB. (beside Session and Entity)

it is an asynchronous type of bean. which mean it has no client view.
after it receive a JMS from client it process the message with MDB and the client has already gone.


SCJP 1.4, SCWCD 1.4, SCBCD 1.3, SCJA<br /> <br />blog: <a href="http://jroller.com/page/rharianto" target="_blank" rel="nofollow">http://jroller.com/page/rharianto</a>
Nicholas Cheung
Ranch Hand

Joined: Nov 07, 2003
Posts: 4982
MDB is the bean to send messages via JMS. It is the bean that handle asynchronious messaging.

You can get more info by referring to chapters 22 and 23 of J2EE 1.4 tutorial.

Nick


SCJP 1.2, OCP 9i DBA, SCWCD 1.3, SCJP 1.4 (SAI), SCJD 1.4, SCWCD 1.4 (Beta), ICED (IBM 287, IBM 484, IBM 486), SCMAD 1.0 (Beta), SCBCD 1.3, ICSD (IBM 288), ICDBA (IBM 700, IBM 701), SCDJWS, ICSD (IBM 348), OCP 10g DBA (Beta), SCJP 5.0 (Beta), SCJA 1.0 (Beta), MCP(70-270), SCBCD 5.0 (Beta), SCJP 6.0, SCEA for JEE5 (in progress)
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: Message Driven Bean...
 
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