Launching another Swing application from existing one using Runtime.exec()

Hi,
I have two separate Swing applications, say A and B. I need to launch B from A using Runtime.exec() - essentially I am launching another VM instance from one VM. I am encountering strange problems - B's main window comes up, but GUI doesn't update; sometimes B comes up and GUI updates, but huge memory leaks happen. All the problems with B go away once A is shut down. It almost looks like both the instances of VM are sharing (or competing for) the event thread. Any comments will be of great help. Thanks.
note: There is no problem launching B if A is a console java application (i.e. no Swing GUI).

Do you have to have the second application running in a seperate VM (process)? If not completely neccesary, then you can just invoke the static main() of the second class. If the type of the second class isn't known untill run-time, you can use Reflection to invoke the method.
Miguel

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