Java Applet java.security.AccessControlException?

Question

When I try to use Group Layout Manager in my applet it gives me this odd exception: java.security.AccessControlException: access denied (java.lang.RuntimePermission accessDeclaredMembers)

When I don't use a layout manager (null) it works fine. To see the whole trace dump go to nuevawave.org/sandbox/JavaGallery/GUIApplet.html and right click somewhere in the top left. If I use absolute layout, there is nothing to click on. The jar is at nuevawave.org/sandbox/JavaGallery/GUIApplet.jar. Any help is appreciated. Thanks.

I don't know if this will help, but here is the applet code:

<applet Archive ="TestApplet.jar,swing-layout-1.0.4.jar"
      Code="test.GUIApplet"
      WIDTH="500" HEIGHT="300"
</applet>

emboss · Accepted Answer · 2011-08-31 03:09:52Z

2

You receive this Exception because the GroupLayout uses Reflection (thus the "RuntimePermission accessDeclaredMembers"). Reflection is considered too powerful for unsigned applets, so the only chance you have is to either sign your applet or use a different layout manager.

answered Aug 31, 2011 at 3:09

emboss

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2 Comments

Nate711 Over a year ago

I used the jarsigner to sign the applet, but I still get the Runtime permission error. Do I have to do something with the html too?

emboss Over a year ago

No, but you have to sign all the Jars involved with the same certificate, so you should sign the swing-layout Jar, too.

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