Help! how can I update JDK from 1.3 to 1.4 for Java Swing correctly?

Urgent! currently I meet one trouble for GUI display, which is developed by Java Swing when I update my JDK1.3 to 1.4. I use JRun as web server and all of the GUI Java Swing code developed based on JDK 1.3 and before I update, all of the GUI display is correct and there are no problem, but after I update to JDK 1.4, I always meet this kind of problem "java.lang NoClassDefFoundError" which is displaye on Java Console and "Exception:java.lang.NullPintException" is displayed on GUI. Sometimes, I need to try two times to display GUI(Jave Swing), then it can work. Could you give me a fever and show me how to fix this problems? which kind of change in JDK Java Swing package?
Thank you much.
Steven

I have recompiled app. by JDK1.4 and I also changed classpath but I can not fix the problem. The strange thing is that I can view the The same GUI(Java Swing) which is installed in another computer using the same JRUN too, but in local computer I can not view the GUI. Do you have some other suggestions? Why Can I view the same GUI instaaled in another computer?
Very Thanks
Steven

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