I think the problem is that the security restrictions inherent in the applet
sandbox are stopping Visad from doing some things that it would otherwise
like to do (like reading System properties).
There are two basic solutions to this. The first is to digitally sign the
applet - this is the way to go if you want to make the applet available to
The second route, more for testing purposes, is to use the policytool that
comes with Java to make a small policy file in your home directory that
grants the appropriate permissions.
This forum post gives a brief outline and explains how to find your "home"
directory in Windows.
If you search the java forums for other posts with "policytool" there are
examples of the policy file format, such as
No virus found in this outgoing message.
Checked by AVG - www.avg.com
Version: 8.5.435 / Virus Database: 271.1.1/2697 - Release Date: 02/19/10