Applet is the only JAR what i need to pack with 7z or lzma.
I know that LWJGL libraryes are packed with lzma format.
maybe some of you, who have made it possible, could help me with my applet jar size problem.
Jar files are already compressed (they are identical to zip files - rename a .jar to .zip for proof!) so if you have a huge jar file you must have huge code or huge resources. I guess the second one. Make sure your image and sound files are as small as possible (gif or jpg rather than png, 16khz mono rather than 44khz stereo sound &c...) then rebuild.