Can a signed Jar be run as an executable?

I ask because I have an unsigned jar that runs and a signed version that doesn't. Looking at the manifests, I see no main class thing for the signed one.

Do I have to run a signed jar from web start?

From stackoverflow

• Not necessarily, but if you don't have a Main-class: in the manifest, you can't run it as an executable. If you know the main class, you can run it using the java executable, eg

  $ java -classpath ./myjar.jar MyClass
  

• you need to sign your jar to run outside of the web start sandbox......

  google here

• Sounds like you build process is updated the manifast.mf