Have a look here - http://java-player.sourceforge.net/index.php , I have never used it but I understand that it works fine with Player 3.0.2 and Stage 3.2.2.
PS : If you get it working - please do tell me ! :-)
I would like to try using java with player/stage.
What is the situation regarding this language?
I found references to a java player client, as well as to some java classes at this page
but I don't have a javaclient folder in that path (latest player 3.1.0-svn)