Running a jar vs running classes under Linux

I still can't figure this out.
I have a jar file that I am trying to run on my Linux server.
The jar file runs on my local machine.
If I try to run the jar file on the linux box I get -
Exception in thread "main" java.lang.NoClassDefFoundError:
javax/sql/ConnectionPoolDataSource
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:120)
If I un jar the file, all classes run correctly.
I have explicitly set the classpath from the command line on each try. Can anyone explain why it works one way and not the other?

Thank you for your help. HOW DO I DO THAT?
And, If I don't already have that information in the jar manifest, why does the jar work on my other machines?
And, I thought the reason you would jar the files up is to make it easy to port to other systems. If I have to change the manifest for each machine that doesn't make it very portable.
I am really frustrated with it and can't seem to find the solution.

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