Java on Linux is important. Debian is important Linux. As hard as it may be to wade through the free/non-free waters and sort out a viable directory structure, java policy, etc., the long term benefits are significant.
What I appreciate is wiring java and the inumerable libraries/jars into Linux in a way such that it becomes transparent. Unfortunately I'm not in a position to help out, just comment on and use the tools. As I become more familiar with the debian context and java policy I may be able to pitch in some. Heitzso