Spring integration java config - spring

Question

EmailQueueListener
#Component
public class EmailQueueListener{
public String handleMessage(String string) {
System.out.println("Message printing"); // this was printed several times
System.out.println(rabbitTemplate.receiveAndConvert()); //received null here
return string;
}
}
configuration
#Configuration
public class RabbitMQConfiguration {
#Bean
public ConnectionFactory connectionFactory() {
CachingConnectionFactory connectionFactory =
new CachingConnectionFactory("localhost");
return connectionFactory;
}
#Bean
public AmqpAdmin amqpAdmin() {
RabbitAdmin admin=new RabbitAdmin(connectionFactory());
admin.declareQueue(queue());
return admin;
}
#Bean
public RabbitTemplate rabbitTemplate() {
RabbitTemplate rabbitTemplate=new RabbitTemplate(connectionFactory());
rabbitTemplate.setRoutingKey("eventsQueue");
rabbitTemplate.setQueue("eventsQueue");
return rabbitTemplate;
}
#Bean
public Queue queue() {
return new Queue("eventsQueue");
}
#Bean
#Autowired
public SimpleMessageListenerContainer messageListenerContainer(EmailQueueListener listener){
SimpleMessageListenerContainer container=new SimpleMessageListenerContainer(connectionFactory());
MessageListenerAdapter adapter=new MessageListenerAdapter(listener, "handleMessage");
container.setMessageListener(adapter);
container.addQueues(queue());
return container;
}
}
Sender
rabbitTemplate.convertAndSend("hello");
I updated the code basing on what you said. But this is not working. i could not see the message which i printed to the console in Listener method. Is their anything wrong in my configuration

Answer 1

Here is another option to register any POJO listener:
#Bean
public SimpleMessageListenerContainer serviceListenerContainer() {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer();
container.setConnectionFactory(rabbitConnectionFactory());
container.setQueues(requestQueue());
container.setMessageListener(new MessageListenerAdapter(new PojoListener()));
return container;
}
Where PojoListener is:
public class PojoListener {
public String handleMessage(String foo) {
return foo.toUpperCase();
}
}
For the MessageListener implementation you should use org.springframework.amqp.support.converter.MessageConverter to extract Message body and convert it to desired domain object.