om = new ObjectMapper();
final SimpleModule module = new SimpleModule("MyModule", new Version(0, 10, 0, null,
"org.jboss.aerogear", "aerogear-simplepush-server"));
module.addDeserializer(MessageType.class, new MessageTypeDeserializer());
module.addDeserializer(RegisterMessageImpl.class, new RegisterDeserializer());
module.addSerializer(RegisterMessageImpl.class, new RegisterSerializer());
module.addDeserializer(RegisterResponseImpl.class, new RegisterResponseDeserializer());
module.addSerializer(RegisterResponseImpl.class, new RegisterResponseSerializer());
module.addDeserializer(HelloMessageImpl.class, new HelloDeserializer());