Specifies the list of roles permitted to access method(s) in an application.
The value of the RolesAllowed annotation is a list of security role names.
This annotation can be specified on a class or on method(s). Specifying it
at a class level means that it applies to all the methods in the class.
Specifying it on a method means that it is applicable to that method only.
If applied at both the class and methods level , the method value overrides
the class value if the two conflict.