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MQSeries.net Forum Index » IBM MQ Java / JMS » JAVAX JMS - MQRFH2 settings problem

JAVAX JMS - MQRFH2 settings problem

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jms_newbie

Posted: Thu Sep 09, 2004 9:39 am Post subject: JAVAX JMS - MQRFH2 settings problem

Newbie

Joined: 09 Sep 2004
Posts: 3

hi all
I am using javax.jms package to write an app that will be able to create MQRFH2 headers also .......... with simple text message as data.

brief code where its failing is :

Code:

TextMessage myMsg =null;
myMsg = queueSession.createTextMessage("test message");
try{

(com.ibm.mq.MQMessage)myMsg).format = com.ibm.mq.MQC.MQFMT_RF_HEADER_2;
}

And the error is :
java.lang.ClassCastException: com.ibm.jms.JMSTextMessage

Is this the correct way to specify that message contains MQRFH2 header ?
IBM's Using Java Documentation says this field would be mapped to MQMD of the message.
help me ...

- a newbie

bower5932

Posted: Thu Sep 09, 2004 9:58 am Post subject:

Jedi Knight

Joined: 27 Aug 2001
Posts: 3023
Location: Dallas, TX, USA

If I understand what you are doing, the RFH2 header will get put on the TextMessage for you. You don't need to do anything special. WMQ will then put all of the JMS fields into the RFH2 header that it needs. You might want to look at mqjmsusr.java on:

http://www.developer.ibm.com/tech/sampmq.html

It creates a TextMessage and you can browse it to see the RFH2.

jms_newbie

Posted: Thu Sep 09, 2004 10:25 am Post subject:

Newbie

Joined: 09 Sep 2004
Posts: 3

thanks bowie for quick reply. i understood what you saying.
just another associated question,
if MQRFH2 is automatically imprinted on the message then why is that java call still needed. i'm still confused
how and when we have to use that method ?

fjb_saper

Posted: Thu Sep 09, 2004 1:13 pm Post subject:

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20756
Location: LI,NY

The RFH2 header is not needed per se to do JMS.
However a number of additional products work better with you if you have it (ex broker ) etc ...

To specify an RFH2 header on your queue define your queue in JMSAdmin as being a "JMS" queue and not an "MQ" queue. The rest gets taken care of by IBM's java JMS implementation.

Enjoy

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