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Regarding JMS

Regarding JMS

2004-07-04 - By ashraf galal

Back

Reply: 1 2 3 4

<html><div style='background-color:'><PRE>K.Pushparaj wrote:<?xml:namespace prefix = o ns
= "urn:schemas-microsoft-com:office:office" /><o:p></o:p><
/PRE><PRE>
        We are using weblogic JMS Queue and
MDB in our system. I am having<o:p></o:p></PRE><PRE>some questions
on the same<o:p></o:p></PRE><PRE>     &nbsp
;  1) Is there any pattern available for using message beans.<o:p></o:p></PRE><PRE>    
      &nbs
p; The implementation of MDB
  uses some sort of the observer pattern<o:p></o:p></PRE><PRE>        2) Where can
I get the details about drawbacks of using MDB.<o:p></o:p>
</PRE><PRE>
        
    J2EE specification (section 17 of EJB 2.0
specification ) or any J2EE book, </PRE><PRE>I recommend the expert
one by one by Rod Johnson<o:p></o:p></PRE><PRE>        3) Can I use MDB as a normal
stateless session bean including<o:p></o:p></PRE><PRE>
database
transaction.<o:p></o:p></PRE><PRE>
             
  MDB does not have either a home
interface nor remote interface, so it is not visible </PRE
><PRE>to
the client, Whereas the session beans are. MDB is a message consumers, </PRE><PRE>it does not have a client view. </PRE><PRE>
Transaction in MDB have to be committed before the OnMessage()
method returns. </PRE><PRE>I don?t think that possible since that
means the instances of a message driven bean </PRE><PRE>
are
equivalent. .  <o:p></o:p></PRE><PRE> <o:p></o:p></PRE><PRE>        4) If any
exception happens can the message will be retained so that<o:p></o:p></PRE><PRE>it will be served next time<o:p></o:p>
</PRE><PRE>MDB can throw system exception upon which the container discards
the bean instance. </PRE><PRE>
However, the exceptions are not
propagated to the client, since there are no clients.  </PRE><PRE>
So, MDB cannot throw application exception. The answer is No. <o:p></o:p></PRE><PRE> Ashraf Galal<o:p></o:p></PRE
><PRE>
 <o:p></o:p></PRE><PRE>
 <o:p></o:p></PRE>
 <o:p></o:p>
 
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