JRE in Kubuntu doesn't allow me to run .jar file

view full story

http://unix.stackexchange.com – I am having trouble trying to run a .jar application on Kubuntu. I created an application in NetBeans in Windows and compiled it into a .jar file. First Windows couldn't find the main class. I searched the internet and fixed some registry values for the JRE and everything works fine now. However, the same problem has arised in Kubuntu, but I can't find anything of help. I've even tried uncompressing the .jar file and modifing the class path in the manifest file with many different path addresses, but nothing works. Since the problem in Windows was on the JRE and not on my application, I think (HowTos)