Error using jar, but the programme works right when i run it from any IDE

I have a programme with 25 .java archives. Is a GUI with a main panel and a JToolBar. When i run ir from Eclipse iDE, NetBeans or in the Linux shell it works rigth. Then i try to make a .jar. In the process i haven't any error, and when the application starts either. But when i click in some of the JMenuItems, they don't work. The function of this Items are change the main panel. It's like some .class of event listeners aren't included, but i check the .jar and has the same .class archives than the compiled project.
What can be problem?? It's very urgent, please.
Regards

I'm so sorry for annoying you, i'm a poor stupid
student that don't have money to hire an expert, so i
try to learn and find help everywhere. But, don't
worry, i resolve my problem by myself.what errors are you getting. It would be helpful if you could post the errors or some stack traces that you are getting

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