I am not explaining very well.
I have a architecture who has a JSP file. This JSP loads an applet and I need the applet to be signed for a correct execution, but the applet is not a jar, it's a class. The JSP file uses a <jsp:plugin> in order to import an applet, but I wanted to avoid changing the code (it works properly) and uses an JAR as applet.
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I need myApplet.class to be signed, but I am obliged to change the code to include the applet as a JAR if I want a signed applet.