t class from being called from calling contexts that are not 
 authorized to call these methods.
 With the exception of the getContextID and GetHandlerKeys methods, containers must
 restrict and afford access to the methods of the PolicyContext class to
 calling contexts trusted by the container to perform container access decisions.
 The PolicyContext class may satisfy this requirement (on behalf
 of its container) by rejecting calls made from an AccessControlContext that has not 
 been granted the "setPol