x.java

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        Config cfg = new Config();
        HazelcastInstance instance = Hazelcast.newHazelcastInstance(cfg);
        HazelcastInstance client= HazelcastClient.newHazelcastClient();
        final IExecutorService ex = client.getExecutorService("ex");
        new Thread(new Runnable() {
            @Override
            public void run() {
                while (true) {
                    Map<Member, Future<String>> futureMap = ex.submitToAllMembers(new GetInstanceNameCallable());
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
            }
        }).start();
        Thread.sleep(5000);
        HazelcastInstance instance2 = Hazelcast.newHazelcastInstance(cfg);
        Thread.sleep(5000);
        HazelcastInstance instance3 = Hazelcast.newHazelcastInstance(cfg);
        Thread.sleep(25000);


    }

    static class GetInstanceNameCallable implements HazelcastInstanceAware, Callable<String>, Serializable {
        transient HazelcastInstance instance;

        @Override
        public String call() throws Exception {
            System.out.println(instance.getName());
            return instance.getName();
        }

        @Override
        public void setHazelcastInstance(HazelcastInstance hazelcastInstance) {
            this.instance = hazelcastInstance;
        }
    }