How can I convert an Object to Json in a Rabbit reply? - spring-amqp

Question

I have two applications communicating with each other using rabbit.
I need to send (from app1) an object to a listener (in app2) and after some process (on listener) it answer me with another object, now I am receiving this error:
ClassNotFound
I am using this config for rabbit in both applications:
#Configuration
public class RabbitConfiguration {
public final static String EXCHANGE_NAME = "paymentExchange";
public final static String EVENT_ROUTING_KEY = "eventRoute";
public final static String PAYEMNT_ROUTING_KEY = "paymentRoute";
public final static String QUEUE_EVENT = EXCHANGE_NAME + "." + "event";
public final static String QUEUE_PAYMENT = EXCHANGE_NAME + "." + "payment";
public final static String QUEUE_CAPTURE = EXCHANGE_NAME + "." + "capture";
#Bean
public List<Declarable> ds() {
return queues(QUEUE_EVENT, QUEUE_PAYMENT);
}
#Autowired
private ConnectionFactory rabbitConnectionFactory;
#Bean
public AmqpAdmin amqpAdmin() {
return new RabbitAdmin(rabbitConnectionFactory);
}
#Bean
public DirectExchange exchange() {
return new DirectExchange(EXCHANGE_NAME);
}
#Bean
public RabbitTemplate rabbitTemplate() {
RabbitTemplate r = new RabbitTemplate(rabbitConnectionFactory);
r.setExchange(EXCHANGE_NAME);
r.setChannelTransacted(false);
r.setConnectionFactory(rabbitConnectionFactory);
r.setMessageConverter(jsonMessageConverter());
return r;
}
#Bean
public MessageConverter jsonMessageConverter() {
return new Jackson2JsonMessageConverter();
}
private List<Declarable> queues(String... nomes) {
List<Declarable> result = new ArrayList<>();
for (int i = 0; i < nomes.length; i++) {
result.add(newQueue(nomes[i]));
if (nomes[i].equals(QUEUE_EVENT))
result.add(makeBindingToQueue(nomes[i], EVENT_ROUTING_KEY));
else
result.add(makeBindingToQueue(nomes[i], PAYEMNT_ROUTING_KEY));
}
return result;
}
private static Binding makeBindingToQueue(String queueName, String route) {
return new Binding(queueName, DestinationType.QUEUE, EXCHANGE_NAME, route, null);
}
private static Queue newQueue(String nome) {
return new Queue(nome);
}
}
I send the message using this:
String response = (String) rabbitTemplate.convertSendAndReceive(RabbitConfiguration.EXCHANGE_NAME,
RabbitConfiguration.PAYEMNT_ROUTING_KEY, domainEvent);
And await for a response using a cast to the object.
This communication is between two different applications using the same rabbit server.
How can I solve this?
I expected rabbit convert the message to a json in the send operation and the same in the reply, so I've created the object to correspond to a json of reply.

Answer 1

Show, please, the configuration for the listener. You should be sure that ListenerContainer there is supplied with the Jackson2JsonMessageConverter as well to carry __TypeId__ header back with the reply.
Also see Spring AMQP JSON sample for some help.