gistfile1.java

@Config(desc = "An individual (or application program) identity")
public class User {
  @Id(desc = "username")
  private String username;

  @Config(desc = "password")
  private String password;

  @Config(desc = "Roles assigned to this user")
  private Set<Role> roles = new HashSet<Role>();
}

@Config(desc = "Role for the permission to access a set of resources")
public class Role {
  @Config(desc = "Permissions to access a set of resources")
  private EnumSet<Privilege> privileges = EnumSet.noneOf(Privilege.class);

  @Config(desc = "Roles assigned to this role")
  private Set<Role> roles = new HashSet<Role>();
}