sdl4gcj is a GCJ(http://gcc.gnu.org/java/) binding to SDL(Simple DirectMedia Layer : http://www.libsdl.org/).
* Added SDL_mixer support.
* Added sdl4gcj/mixer package.
** sdl4gcj.mixer.Music class
** sdl4gcj.mixer.Chunk class
** sdl4gcj.mixer.Mixer class
