Check of Current Thread

1. AccessController is in the system ProtectionDomain –
Permission is implicitly granted
Proceed to the next frame on the thread stack

2. SecurityManager is in the system ProtectionDomain –
Permission is implicitly granted
Proceed to the next frame on the thread stack

3. System is in the system ProtectionDomain –
Permission is implicitly granted
Proceed to the next frame on the thread stack

4. GetProperty is in the application domain – Is the permission
granted?

If yes, then proceed to the next frame on the thread stack
If no, throw a SecurityException