Not able to configure resolver for my incoming RabbitMq message

Question

I'm writing integration tests for my application that sends messages to RabbitMq. As part of my test config, I'm declaring some RabbitListeners to get these messages.

I know I'm not too far off, because this is working :

 @RabbitListener(bindings = @QueueBinding(
    value = @Queue(
        value = "myQueue",
        autoDelete = "true",
        exclusive = "false",
        durable = "false"),
    exchange = @Exchange(
        value = "myExchange",
        autoDelete = "true",
        durable = "true"),
    key = "myRoutingKey"))
public void confirmEligibilityMessage(Object eligibilityEvent) {
    log.info("received message [{}]", eligibilityEvent);
    receivedMessages.add(eligibilityEvent);
}

--> message is received

However, I would like the message to be converted directly to the expected type, so I'm modifying the signature of the method by adding the type of the payload :

public void confirmConsolidationEligibilityMessage(@Payload EligibilityEvent eligibilityEvent)

and I'm getting this issue :"No converter found to convert to.."

Caused by:       org.springframework.amqp.support.converter.MessageConversionException: Cannot   handle message
... 13 common frames omitted
Caused by: org.springframework.messaging.converter.MessageConversionException: No converter found to convert to class messaging.outgoing.EligibilityEvent, message=GenericMessage [payload={"requestCode":"someRequestCode","isEligible":false}, headers=...

I have tried what is proposed here and made my GlobalEventBusListener implement RabbitListenerConfigurer like this :

public class GlobalEventBusListener  implements RabbitListenerConfigurer {

private final List<Object> receivedMessages = new ArrayList<>();

@Override
public void configureRabbitListeners(RabbitListenerEndpointRegistrar registrar) {
    registrar.setMessageHandlerMethodFactory(myHandlerMethodFactory());
}

@Bean
public MessageConverter jackson2Converter() {
    MappingJackson2MessageConverter converter = new MappingJackson2MessageConverter();
    return converter;
}

@Bean
public DefaultMessageHandlerMethodFactory myHandlerMethodFactory() {
    DefaultMessageHandlerMethodFactory factory = new DefaultMessageHandlerMethodFactory();
    factory.setMessageConverter(jackson2Converter());
    return factory;
}

But I still get issues because conversion doesn't happen properly - message is different though..

Caused by: java.lang.IllegalStateException: No suitable resolver for argument [0] [type=messaging.outgoing.EligibilityEvent]
HandlerMethod details: 
Controller [mocks.GlobalEventBusListener]
Method [public void mocks.GlobalEventBusListener.confirmEligibilityMessage(messaging.outgoing.EligibilityEvent)]

Any idea of what I could try ? I'm not sure how to investigate further.. Should I log all beans instantiated by Spring Boot and take it from here ? what kind of beans should be here so that it works ? With Spring Boot "magic", I initially thought that simply having a MessageConverter like below in my context would do the trick, but it looks like it's not the case :

@Bean
public MessageConverter jackson2Converter() {
    MappingJackson2MessageConverter converter = new MappingJackson2MessageConverter();
    return converter;
}

Thanks !!

score 1 · Answer 1 · answered Oct 27 '16 at 13:32

1

Use a Jackson2JsonMessageConverter from spring-amqp - see the documentation.

Also, starting with version 1.6, when using @RabbitListener annotations (on methods), the inferred type information is added to the MessageProperties;...

The framework configures the type the converter will convert to, based on the method signature.

answered Oct 27 '16 at 13:32

Gary Russell

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Thanks a lot Gary, I had overlooked this part of the doc. I was focusing on the receiver part, but I was not sending the message properly : I was sending it as a String, so content-type in headers was not set properly to Json. – Vincent F Oct 28 '16 at 03:52

score 1 · Answer 2 · answered Oct 27 '16 at 22:48

If all messages have the same type (can be deserialized with the same MessageConverter) it is enough to add Jackson2JsonMessageConverter to your application context:

@Bean
MessageConverter messageConverter(ObjectMapper objectMapper) {
    Jackson2JsonMessageConverter jackson2JsonMessageConverter = new Jackson2JsonMessageConverter();
    jackson2JsonMessageConverter.setJsonObjectMapper(objectMapper);
    return jackson2JsonMessageConverter;
}

Passing ObjectMapper as a parameter lets you configure Jackson using Spring Boot configuration properties.

Since it wasn't very clear for me at the beginning how to configure Spring Boot and Spring Amqp to serialize/deserialize JSON messages I created sample project you may want to have a look: https://github.com/maciejwalkowiak/spring-boot-spring-amqp-java8-lombok-sample

Vincent F · Accepted Answer · 2016-10-28T04:13:38.787

Thanks to Gary's help and a little bit more reading on the documentation, I was able to fix it. By the way I'm using Spring amqp 1.5.6, ie < 1.6.

first thing is that I was sending the message as a Json String, bypassing the AmqpTemplate's converter : by passing my object directly to amqpTemplate.convertAndSend method, without converting it myself to Json, headers were set properly, to help the receiver identify the content is Json.
second, I simply had to add this in my config :

-

@Bean
public Jackson2JsonMessageConverter jackson2Converter() {
    Jackson2JsonMessageConverter converter = new Jackson2JsonMessageConverter();
    return converter;
}

@Bean
public RabbitListenerContainerFactory rabbitListenerContainerFactory() {
    SimpleRabbitListenerContainerFactory simpleRabbitListenerContainerFactory = new SimpleRabbitListenerContainerFactory();
    simpleRabbitListenerContainerFactory.setConnectionFactory(connectionFactory());
    simpleRabbitListenerContainerFactory.setMessageConverter(jackson2Converter());
    return simpleRabbitListenerContainerFactory;
}

score 0 · Answer 4 · answered Mar 14 '19 at 20:37

I had a similar problem and what worked for me was to simply set the Jackson2Message message converter as

webSocketStompClient.messageConverter = new MappingJackson2MessageConverter()

I found useful info (and examples) about this on: https://github.com/Noozen/spring-boot-websocket-client#the-java-client

Not able to configure resolver for my incoming RabbitMq message

4 Answers4