public void submitCallableWithNullResultToAllMembers_withMultiExecutionCallback() throws Exception {
IExecutorService service = client.getExecutorService(randomString());
final CountDownLatch responseLatch = new CountDownLatch(CLUSTER_SIZE);
final CountDownLatch completeLatch = new CountDownLatch(CLUSTER_SIZE);
Callable callable = new NullCallable();
service.submitToAllMembers(callable, new MultiExecutionCallback() {
public void onResponse(Member member, Object value) {
if (value == null) {
responseLatch.countDown();