@Test public void testPostBookProcessingException() throws Exception {
  String address="http://localhost:" + PORT + "/bookstore/";
  List providers=new ArrayList();
  providers.add(new FaultyBookWriter());
  WebClient wc=WebClient.create(address,providers);
  Future future=wc.async().post(Entity.xml(new Book()),Book.class);
  try {
    future.get();
    fail("Exception expected");
  }
 catch (  ExecutionException ex) {
    assertTrue(ex.getCause() instanceof ProcessingException);
  }
  wc.close();
}