Jackson2JsonMessageConverter not work for rabbitmq - spring

Question

I use following code for message converter:
SimpleMessageListenerContainer container(ConnectionFactory connectionFactory, Queue queue,
MessageListenerAdapter listenerAdapter) {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
container.setConnectionFactory(connectionFactory);
container.setQueueNames(queue.getName());
container.setMessageListener(listenerAdapter);
container.setMessageConverter(new Jackson2JsonMessageConverter());
return container;
}
My listener is declared:
public void receiveMessage(List<Map<String, Object>> message) {
try {
System.out.println("Received <" + new String(message, "UTF-8") + ">");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
But it always try to gives follow error:
Failed to invoke target method 'receiveMessage' with argument type = [class [B], value = [{[B#40c2d9c5}]","at org.springframework.amqp.rabbit.listener.adapter.MessageListenerAdapter.invokeListenerMethod(MessageListenerAdapter.java:408)
It seems it tries to invoke byte[] as argument instead of convert json string to List>.

Answer 1

The converter requires a content_type message property that contains the token json - e.g. application/json. You should see a WARN log if you are using at least version 1.6.1.
log.warn("Could not convert incoming message with content-type ["
+ contentType + "], 'json' keyword missing.");
If you can't change the producer to set the content type properly, you can subclass the converter...
#Override
public Object fromMessage(Message message, Object conversionHint) throws MessageConversionException {
message.getMessageProperties().setContentType("application/json");
return super.fromMessage(message, conversionHint);
}