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Editorial Team
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Asked: 2026-05-11T18:17:29+00:00

I’m trying to deploy a Java applet on my website. I also need to

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I’m trying to deploy a Java applet on my website. I also need to sign it, because I need to access the clipboard. I’ve followed all the signing tutorials I could find but have not had any success. Here is what I’ve done so far:

  • Wrote an applet in NetBeans. It runs fine in the applet viewer.
  • Made a .jar file out of it.
  • Created a certificate by doing this:
keytool -genkey -keyalg rsa -alias myKeyName
keytool -export -alias myKeyName -file myCertName.crt
  • Signed it wtih jarsigner like this:
jarsigner "C:\my path\myJar.jar" myKeyName
  • Made an html file containing this:
<html>
  <body>
<applet code="my/path/name/myApplet.class" archive="../dist/myJar.jar"/>
  </body>
</html>

When I open that html file, I never get the security confirmation dialog box (and thus get the “java.security.AccessControlException: access denied” error). This happens on all browsers.

Am I missing a step?

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1 Answer

  1. Editorial Team

    Perhaps it’s because you’re opening some .class files outside the jar file?

    That way it may not display the warning. I tried doing it that way but it still showed me the certificate warning and for a simple case it actually prevented me from accessing a class from the JAR with the separated class.

    Maybe your specific setup or file organization causes that behavior. If you can layout that in more detail we could help better (or rather, try putting all those .class files in yet another signed Jar and add it to the archive”…, anotherJar.jar”).

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