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Both the single and double argument checkPermission() methods defer to the single argument java.security.AccessController.checkPermission(Permission perm) method. When invoked directly, this method operates only on the current execution context and as a result, does not supersede the security manager's two argument version.

There is also another (cleaner and preferable) way to handle the A cleaner approach to making a security check from a different context . This is accomplished by taking is to take a snapshot of the current execution context in which the check must be performed, using the java.security.AccessController.getContext() method that returns an AccessControlContext object. The AccessControlContext class itself defines a checkPermission() method that encapsulates a context instead of accepting the current executing context as a parameter. This is allows the check to be performed at a later time, as shown below.

// Take the snapshot of the required context, store in acc and pass it to another context
AccessControlContext acc = AccessController.getContext();

// Accept acc in another context and invoke checkPermission() on it
acc.checkPermission(perm);

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