Permissions error for a signed Java applet when including external JAR files

Question

I have a signed Java applet. And it works fine. But now I have to integrate some 3rd party JAR files with it. When I test it from Eclipse, the whole thing works correctly. But when I test it as an applet, it gives me a java.security.AccessControlException: access denied (java.io.FilePermission ...)

I thought this was because those 3rd party JAR files don't have a java.policy.applet within them. But manually adding the policy file doesn't get rid of the error.

What am I missing? Thanks!

============================

All the 3rd party JAR files sit on the server filesystem like so: A.jar, B.jar, C.jar. And I include them in the applet tag like so:

<applet
    archive="my.jar,A.jar,B.jar,C.jar">
</applet>

Also, in the MANIFEST/MANIFEST.MF file in my.jar, I include those JAR files like so:

Class-Path: A.jar,B.jar,C.jar

Answer 1

You have to sign these jars as well, if they are attempting restricted operations.