I'm trying to sign my applet following the instructions here:  http://wiki.processing.org/w/Sign_an_Applet .

Unfortunately when I try to open the .jar file in Terminal or X11 (the mac terminal emulators), I get an error message that the .jar file could not be opened and I should check the Java console for error messages. I have not been able to find a way to open the Java console on a mac outside of a browser. The Java console I have running in Safari is not showing any error messages. 

Any help would be much appreciated.

Thank you!