Application won't work as JAR file

Hello all,
I am new to java and just wrote my first java program today. I finally got it compiled and working. I have no problems running the application from the command line when the application is not JARred up. When I JAR is up, the application will launch, but the one function it is supposed to excute doesn't work anymore. I created the JAR file with a main class definition in the manifest file.
The error the console is spitting out when the action executes is this:
Exception occurred during event dispatching:
java.lang.NoClassDefFoundError: lotus/domino/NotesException
Now, this appears to be not finding one of my imported classes, but I have my classpath set to include the package. It works fine when the app is not a JAR, but when it is I get the above error.
Can anyone point me in the right direction?
Thanks in advance!
_george

Executable jar files do not use the classpath, at least they don't use the CLASSPATH environment variable. (I assume that's what you are referring to when you say "I have my classpath set...".) Instead, they use the classpath defined in their manifest files. You have main-class defined there, you have to define classpath there too. Here's a link to an explanation:
http://java.sun.com/docs/books/tutorial/jar/basics/manifest.html

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