Display JMS message from MDB to a view(JSF, SWING Applet or whatever)

Question

I'm currently developing a JMS system. I have been able to develop the publisher (JSF), the subscriber (MDB) and I can print the JMS messages to the console from the onMessage method of the MDB.

My problem is that I can't manage to display them in a view: Either JSF, Applet or JTextArea swing.

How can I invoke the JTextArea of a given applet from the onMessage method of the MDB? I have tried to instantiate an Applet object from the MDB

ex: TestApplet tst = new TestApplet(): Then into the onMessage method, after having extracted the message into testMessage variable I tried: tst.textAtrea.append(testMessage);

Here I got an error from the container.

Beside the above example, I would appreciate any other solution to my problem (just want to display the JMS messages in a view, not only at the console)

When you add the mdb tag, it gets translated to ms-access. I think you intended message-driven-bean instead so changed the tags accordingly. — HansUp, Sep 23 '13 at 14:17

score 0 · Answer 1 · answered Sep 23 '13 at 13:11

0

It is bad idea to invoke a part of applet from MDB. Message will not be consumed till onMessage method is executed successfully. I would rather try to put the message in the some storage system (files or databases) and then display from these resources.

answered Sep 23 '13 at 13:11

Abhijith Nagarajan

3,865
18
23

Hmmm..., i already thought about it but that might cause some delays in a scenario of real time data distribution. I'm working on my diploma thesis and it is a concern for me. – erzen kaja Sep 23 '13 at 13:14

score 0 · Answer 2 · edited May 23 '17 at 12:05

You cannot really use MDBs together with a Swing client in your scenario.

Instead

Remove the MDB
Implement a stand-alone command-line Swing client to listen on the queue directly.
If you use a MessageListener in your Swing application, you will have an onMessage method there as well.
Anyway you have to pay attention to the way you update Swing components from another thread: You can find the details here: Should we use EventQueue.invokeLater for any GUI update in a Java desktop application?

Any other client type (JSF, applet) will be more difficult.

Display JMS message from MDB to a view(JSF, SWING Applet or whatever)

2 Answers2