Signing JAR but file still does not work as a Java Web Start Application

Question

I've followed everything I could find online about making Java Web start applications. I did sign my jar, however when I verify it I get the following:

And when I try to use the jar in a web start application, I get the security warning about unsigned applications. Any help would be appreciated, thanks.

Oh, also, the jar was made using eclipse, if that helps at all.

This is what the warning looks like, the application runs but nothing works:

The JNLP is as follows:

<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase=
"mydomain" 
    href="/webstart.jnlp">
    <information>
        <title>Game of Life</title>
        <vendor>My name</vendor>
    </information>
    <resources>
        <!-- Application Resources -->
        <j2se version="1.7+"
              href="http://java.sun.com/products/autodl/j2se"/>
        <jar href="/GoL.jar"
            main="true" />

    </resources>
    <application-desc
         name="The Game of Life"
         main-class=
           "Frame"
         width="857"
         height="636">
     </application-desc>
     <update check="background"/>
</jnlp>