You'll need to add any classpaths required (specifically for things like the sqlite jdbc connector) as a part of the manifest. JCreator I'd assume has a way of doing this via the gui when creating the jar.
Check here: http://docs.oracle.com/javase/tutorial/deployment/jar/
Also, you'll probably need to sign it if you are working with filesystem, for that you can follow this tutorial: http://docs.oracle.com/javase/tutori...signindex.html
You'd need to verify the error to be sure, but if its throwing a classpath error my expectation is it cannot load the driver you are using from the sqlite-jdbc connector (which you will also need to provide). The stack trace should tell you which class its attempting to load.