I am using Creo 2.0 and I have the old binary files(.jar) which is running perfectly fine.
When I tried to rebuild the application inside the NetBeans and register inside the Creo I am getting the following error:
Startup of application "XXXXX" failed.
I don't know why because it is running fine with the old binary but with the updated one not.
check your creo install has the jre installed inside it (you have to purposely choose to install the jre when you run creo installer).
unfortunatelly Creo will not help you to find the root of the problem.
Do you use the same Java JDK version which was used to compile your old binary files ?
Last time I compiled an application for creo 2.0, I used j2sdk1.4.1_07.