What happens when a server side failure occurs during an asynchronous invocation using JAX-RS client API

AsyncJaxrsClient_2.java

@Test
public void failedMethodCalledAfterServerSideFailureForStringEntity() throws InterruptedException {
        CountDownLatch l = new CountDownLatch(1);

        ClientBuilder.newClient().target("http://google.com").path("first").request().async().get(new InvocationCallback<String>() {
            @Override
            public void completed(String response) {
            }

            @Override
            public void failed(Throwable throwable) {
               Logger.getAnonymousLogger().log(Level.INFO, "Error message: {0}", throwable.getMessage());
               l.countDown();
            }
        });

        boolean result = l.await(3, TimeUnit.SECONDS);
        assertTrue("Failed method not called", result);
}