When adding applications to my Samsung Impression, I found that I often could find the .jar-file associated with an application, but that the provider of the .jar-file often expected the end user to generate their own .jad file. In Windows, users could easily use the Jadgen.exe program. However, I had no idea how to do this in Linux.
A little Googling (yes, it’s a verb now) and I found the link to jadmaker.sh at http://www.blackberryforums.com/linux-users-corner/65661-jadmaker-sh-create-missing-jad-jar.html. It works like a champ. Give it a go!