Trying to get a signed applet to work in a browser but fails miserably

Question

I created a JApplet which uses two external libraries (JENA and JUNG). The applet works correctly when i run it from the IDE (using eclipse). I created a jar file, signed it

Answer 1

1. You should use in your applet declaration in the HTML. You can also try adding Class-Path to your MANIFEST.MF of the main jar (see here)
2. No. Unless you have a Main-Class specified in your MANIFEST.MF
3. Yes, in case the external jars do some security-sensitive operations (like reading/writing the file system)
4. No.