The previous follow up: In my case this is caused by jh_manifest: % ./javatut.jar Hello world % jh_manifest -cnet.zabuchy.Main javatut.jar % chmod +x javatut.jar % ./javatut.jar Error! CRCs do not match! Got 1a6cd7b3, expected 0 should go to a bug #634089 - I've typed wrong number, sorry. Tomasz Muras