My application won't run inside VisualAge for Java!
First: make sure you don't have any errors in your application by going to the "All problems tab" in the workspace. If there are any problems, fix them and try again.
If you're not getting any messages, edit your application's handleException() method, uncommenting the lines that print the exception details. This should help see the problem that's affecting the application. Note that if you use other beans in your application you may need to uncomment their handleException to see the problem as well.
Alternatively, you could select all exceptions listed in the debugger's "Caught Exceptions" function.
If you're getting java.lang.NoClassDefFound exceptions, most likely your runtime CLASSPATH isn't properly set.