8 Replies Latest reply on May 30, 2007 8:17 AM by timfox

Listing JMS Messages using JMX doesn't give full message

mskonda May 29, 2007 10:15 AM

I have developed set of tools to "browse" messages on destinations for Kabutar. The approach I've taken is to use JBoss JMS MBeans rather than clumsy JMS QueueBrowser.

I am able to create/fetch the MBean responsible for the destination of my interest, however, when I try to have a peek at the message content, I don't get anything except printing:

JBossMessage[0]:NON-PERSISTENT
JBossMessage[0]:NON-PERSISTENT

etc..

I get null when I tried getting the text (after convesion to TextMessage) from the message.

here's my test code:

 public void testQueueInfo() throws Exception
 {
 String name = "testSecuredQueue";
 logger.info("Deploying the queue - " + name);
 MBeanServerConnection mBeanServer = lookupMBeanServerProxy(new InitialContext());
 ObjectName serverObjectName = new ObjectName(
 "jboss.messaging.destination:service=Queue,name=" + name);
 ArrayList o = (ArrayList) mBeanServer.invoke(serverObjectName,
 "listAllMessages", new Object[0], new String[0]);
 for (Iterator i = o.iterator(); i.hasNext();)
 {
 Message msg = (Message)i.next();
 logger.info("Message: " + msg);
 TextMessage txtMsg = (TextMessage)msg;
 logger.info("TxtMessage: " + txtMsg.getText());
 }
 }

The same happens when you access litAllMessages method via JMX Browser

Any pointers?

Thanks
Madhu

1. Re: Listing JMS Messages using JMX doesn't give full message

timfox May 29, 2007 2:28 PM (in response to mskonda)

This is probably because the messages aren't serializable.

It would be a fairly simple matter to make them serializable.

Madhu- can you add this in JIRA against 1.4.0.CR1?
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2. Re: Listing JMS Messages using JMX doesn't give full message

jay.howell May 29, 2007 4:58 PM (in response to mskonda)

Hey Madhu

16:47:04,360 INFO [HelloWorldService] TxtMessage: some text
16:47:04,360 INFO [HelloWorldService] Message: JBossMessage[25411]:NON-PERSISTENT
16:47:04,360 INFO [HelloWorldService] TxtMessage: some text
16:47:04,360 INFO [HelloWorldService] Message: JBossMessage[25412]:NON-PERSISTENT
16:47:04,360 INFO [HelloWorldService] TxtMessage: some text
16:47:04,360 INFO [HelloWorldService] Message: JBossMessage[25413]:NON-PERSISTENT
16:47:04,360 INFO [HelloWorldService] TxtMessage: some text
16:47:04,360 INFO [HelloWorldService] Message: JBossMessage[25414]:NON-PERSISTENT
16:47:04,360 INFO [HelloWorldService] TxtMessage: some text
16:47:04,360 INFO [HelloWorldService] Message: JBossMessage[25415]:NON-PERSISTENT
16:47:04,360 INFO [HelloWorldService] TxtMessage: some text
16:47:04,360 INFO [HelloWorldService] Message: JBossMessage[25416]:NON-PERSISTENT
16:47:04,360 INFO [HelloWorldService] TxtMessage: some text
16:47:04,361 INFO [HelloWorldService] Message: JBossMessage[25417]:NON-PERSISTENT
16:47:04,361 INFO [HelloWorldService] TxtMessage: some text
16:47:04,361 INFO [HelloWorldService] Message: JBossMessage[25418]:NON-PE

I ran the test and the tests seem to come out fine. I've tried persistent and non persistent messages. I can't reproduce your error. I did not change your case.

Using your code you should be able to see at least the "TxtMessage:" text with no message.
Your output that you showed above does not show that. The output that you showed above is the default toString() which does not look like it includes the message.
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3. Re: Listing JMS Messages using JMX doesn't give full message

jay.howell May 29, 2007 5:12 PM (in response to mskonda)

I just ran an external client against the message. Here's what I get ....

Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null
Message: JBossMessage[0]:NON-PERSISTENT
TxtMessage: null

This was from an external client. If I run this from inside of an MBean, it is fine. You should be able to get these running locally in an MBean as a workaround.
Jay:)
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4. Re: Listing JMS Messages using JMX doesn't give full message

timfox May 29, 2007 5:17 PM (in response to mskonda)

Yes, that's why I made the comment about the messages are not serializable, hence you can't see them from a different VM or classloading domain.
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5. Re: Listing JMS Messages using JMX doesn't give full message

timfox May 30, 2007 6:36 AM (in response to mskonda)

http://jira.jboss.com/jira/browse/JBMESSAGING-975
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6. Re: Listing JMS Messages using JMX doesn't give full message

timfox May 30, 2007 7:37 AM (in response to mskonda)

This was a pretty trivial fix so I have fixed it now.

It will be in the next release (1.3.0)
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7. Re: Listing JMS Messages using JMX doesn't give full message

mskonda May 30, 2007 8:05 AM (in response to mskonda)

Lovely!

Tim, could you tell me what the fix is (probably I'll build into my local copy)? I can't wait.. :)

Thanks
Madhu
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8. Re: Listing JMS Messages using JMX doesn't give full message

timfox May 30, 2007 8:17 AM (in response to mskonda)

Just needed to make org.jboss.messaging.core.message.MessageSupport serializable.

I think that was it.

If you svn update from TRUNK and build from source the fix will be there
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