Not that I can pretend to be knowledgeable on Java (because I hate it with a passion :P) but reading through some of the Sun forums it seems that you need to look in your Java install, then in jre/ext/security/ that is where the java.policy file is.
To find your java.policy file try:
Code:
$ locate java.policy
Or maybe look for the security directory:
Code:
$ locate security | grep ext
Hopefully you can find where to put that java.policy file.
Then!
The suggestion there was to do either grant all permissions (unsecure therefore):
Code:
grant {
permission java.security.AllPermission;
}
Or just for the website:
Code:
grant codeBase "http://the.url.here" {
permission java.security.AllPermission;
}