java.policy

keystore "file:/yourDir/yourKeystoreFile";

grant signedBy "Joe", codeBase "http://wwwwbs.cs.tu-berlin.de/~josefw/java/jdkSigned/Test.jar"
{
permission java.util.PropertyPermission "user.home", "read";
permission java.io.FilePermission "${user.home}${/}test.txt", "read,write";
};