Exactly the same problem for me, except I tried swt 3.2M3... I'm not a gcj expert and I've no idea what are those verification errors... I would suggest using proguard to optimize all your libs alltogether. Hopefully it will get rid of those classes, that do not compile... -- Sent from the gcc - java forum at Nabble.com: http://www.nabble.com/Trouble-compiling-swt.jar-t589406.html#a1579171