How can I handle 3rd party dependencies in a .jad file? Is it possible to bundle a .jar? Do you need to unpack it and include the .class>
Can't speak too much for J2ME generically but for BlackBerry you can turn compiled .jar files into .cod files (the BlackBerry binary file format - basically an optimized .jar) and include those along with your application .cod files. You will have to list the additional .cod files in the .jad.
This link from the BlackBerry knowledgebase should help.