For network communication from your FRC robot, you can use the "Generic Connection Framework" in Java ME.
See
http://developers.sun.com/mobility/m...ericframework/ for an article in the GCF.
Also look at a presentaion "Java For FRC" that contains hints on more advanced topics for Java on your rorbot.
http://www.usfirst.org/uploadedFiles...FRCKickoff.pdf