SAP NETWEAVER MII Applet Problem

Due to my custom action SAP Netweaver MII Workbench would not load on my computer. Tried different JRE Versions up to no use. 

The exception was: java.security.AccessControlException

Since the custom action is not signed, it could most probably have been because of that.
Nevertheless the issue was resolved by editing/creating java.policy file in JRE/lib/security directory with this content:

grant {
permission java.security.AllPermission;
};

Note: With this all the you give the applets to do whatever they wish. So be careful.


Another issue that came up was a duplicate class file that existed. Clearing out the cache and not storing the cache resolved it.