The old COM program IS still supported, but it will go away at some time in the future along with support for UNVs. There are no .jar files for this, you have to get the information from Designer.exe, which is 32-bit only. You'll also probably have to "register" it with Windows before you can use it - the install no longer automatically registers it. To do this, go to a command prompt and run it with the /RegServer flag.
I find it MUCH easier to work with this in .NET than in Java. I'm currently working on a project to document all universes and their usage in Webi reports - the part for the .unv universes will be written in .NET and the rest of it will probably be in Java.
-Dell