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Messaging and JMS

 
Vivek Viswanathan
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Hi
Here are some links on JMS that may be usefull in light of the Certification. I hope it is usefull.

1) Introduction to messaging and JMS
This article will give you a brief, but a very nice introduction to messaging.
It will also give you the advantages of Messaging
URL: http://www.javaworld.com/jw-01-1999/jw-01-jms.html

2) The initial part of this Article is usefull in getting a comparison between using RPC for B2B communication to using JMS for B2B communication
URL: http://www.javaworld.com/jw-02-2000/jw-02-jmsxml.html
3) Initial Part of this Article may be usefull for the Advantages and Disadvantages of MOM
URL: http://www.javaworld.com/jw-05-1998/jw-05-step.html
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Some of my notes
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Disadvantages of messaging
1. There is no return value from an asynchronous operation. If an output is needed, the sender and the receiver must agree that the result will be posted in a particular queue. They must also agree to an identifier for that particular message to which it is a response. Finally the sender of the original message must listen for message deliveries or pool the queue to await the arrival of their response.
2. Another downside is that Transactions effectively stop at asynchronous boundaries. This means that other mechanisms are required to handle any failure of the task that the message represents.
I need some links on Message Beans in EJB 2.0, what I am looking for is not how use the Messages Beans, but the scenarios in which Message Beans have to be used ( is this need for the Certification ).
I also need some information on the scenarios in which I have to use Synchronous and Asynchronous Messaging.
Could anyone who has completed the Part I of the exam tell me if all this information is sufficient ? , If I am missing out anything please let me know

Thanx
Vivek Viswanathan
 
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