Most Java implementations are not free software, but for one that is, have a look at the 'gcj' package, which even compiles to native code!
-- David N. Welton Consulting: http://www.dedasys.com/ Personal: http://www.dedasys.com/davidw/ Free Software: http://www.dedasys.com/freesoftware/ Apache Tcl: http://tcl.apache.org/