Create  object for a class in jar file

Hi
I am using Oracle JDeveloper 10g. I have created a main application using Swing/JClient technologies. I am facing a problem for the past one week. I let u all people know my problem and I kindly request you to send a solution if known possibly confirmed.
Problem: I have created a main application using swing that class extends JFrame. This main application consists of two parts. One left side panel and one right side panel. Left side panel contains JTree component. Each item in that tree refers to a class file located in a separate jar file.i.e that acts as a separate application. If we are executing separately that jar file class, I am able to see that small application running. If I am selecting an item in JTree during runtime, I should place that small application from the respective jar file in the right side panel of the main application. I can locate the jar file and even I can create object to that particular class file. But I cannot execute the application even separately and also not able to place in the right side panel of the main application.
Note: The small application from the jar file contains one class file containing main method. That class file extends JPanel and implements JUPanel. i.e., with data binding. I am trying to create an object for this class file with data binding from my main application. Navigation bar is used in the main class file.
If possible can any provide me solution at the earliest. Waiting eagerly for the positive reply.
Regards,
s.senthilkumar

Can you sure that there is only a A class in the classpath of Tomcat, I advise you to add
some statements into the A class so that you can be sure which classloader is used
to load the A class.

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