Hi,
I've looked into running a one-jar executable as an applet too. Basically I found the main issue centres on whether you need to build a signed or an unsigned applet.
I've found so far that one-jar does two things which are not permitted in unsigned applets:
1. it accesses system properties via System.getProperty and System.setProperty which causes it to fail at startup due to...
2009-05-07 13:13:57 UTC in One-JAR(TM)