String user = "/C=US/O=National Center for Supercomputing Applications/CN=Hemapani Srinath Perera";
registry.createGroup(user, "group1", "group1");
registry.createGroup(user, "group2", "group1");
registry.createUser(user, "user1", "User1");
registry.createUser(user, "user2", "User1");
registry.createUser(user, "user3", "User1");
registry.addUsertoGroup(user, "group1", "user1");
registry.addUsertoGroup(user, "group1", "user2");
registry.addUsertoGroup(user, "group2", "user3");