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I ran into something like this when cracking CISCAT Pro, it was a "install4j" package as the app itself - so instead of having and installer that deploys the software, the software that run is each time is an installer package that decrypts to a temp directory (which is why my current crack is a race condition in powershell (but works great)). (it did use a dll file in the process as well)
Anyway if that is what happened in your case then it might help to know that these things (Exe4j for example) bundle the actual java code in a pack200 format, and then for some mysterious-to-me reason they xor it all with x88. You said you already decrypted the jar so maybe this isn't your issue... ? If you have a jar and the program is just java, then it seems you should be able to set your manifest Main-Class and run it.
edit: i just realized these posts are years old. oh well, maybe someone else working on a java package will see this and find use.
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