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I don't know the meaing of activation specification

avseq anthoy
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Joined: Apr 27, 2004
Posts: 104
Dear all

In my thinking , I should only specify the queue and connecitonFactory and my message client and message server can comnunication to each other when I use jms message provider.

But in some situation , I have to configure activation specification on WebShpere despite I have configured the proper queue and connection factory.


The definition of activation specification as below , but I can't understand.
Can someone tell me the meaning and why I should configure activation specification even I have configured proper queue and connection factory?

You create a JMS activation specification if you want to use a message-driven bean to communicate with the default messaging provider through Java™ EE Connector Architecture (JCA) 1.5. JCA provides Java connectivity between application servers such as WebSphere® Application Server, and enterprise information systems. It provides a standardized way of integrating JMS providers with Java EE application servers, and provides a framework for exchanging data with enterprise systems, where data is transferred in the form of messages.


Best Regards


My Way,My Pace
Deepak Pant
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Joined: Feb 13, 2004
Posts: 443
See the easiest way to understand Activation Spec is:

1. IBM has implemented messaging using Service Integration Bus, which requires you to have SIB Queue and SIB Topic Space.

2. JEE mandates messaging implementation in form of JMS, which requires JMS Queue and JMS Topic.

3. The Activation Spec is the glue which connects the JMS Queue to SIB Queue including the destination details.

IBM has overly complicated the whole process of messaging but thats the only way to use it.

You may have already seen this link:
http://www.ibm.com/developerworks/websphere/techjournal/0504_reinitz/0504_reinitz.html
avseq anthoy
Ranch Hand

Joined: Apr 27, 2004
Posts: 104
Thanks for your reply. The exposition is very concise and clear.

Deepak Pant wrote:See the easiest way to understand Activation Spec is:

1. IBM has implemented messaging using Service Integration Bus, which requires you to have SIB Queue and SIB Topic Space.

2. JEE mandates messaging implementation in form of JMS, which requires JMS Queue and JMS Topic.

3. The Activation Spec is the glue which connects the JMS Queue to SIB Queue including the destination details.

IBM has overly complicated the whole process of messaging but thats the only way to use it.

You may have already seen this link:
http://www.ibm.com/developerworks/websphere/techjournal/0504_reinitz/0504_reinitz.html
 
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