Ok. So i have a rabbit configuration class with some constants and I try to add a service to my listenercontainer listener.
@Configuration
public class RabbitConfig {
@Bean
public ConnectionFactory connectionFactory() {
CachingConnectionFactory connectionFactory = new CachingConnectionFactory(HOST);
connectionFactory.setPort(CONN_PORT);
connectionFactory.setUsername(USERNAME);
connectionFactory.setPassword(PASSWORD);
return connectionFactory;
}
@Bean
public AmqpAdmin amqpAdmin() {
return new RabbitAdmin(connectionFactory());
}
@Bean
public RabbitTemplate rabbitTemplate() {
RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory());
rabbitTemplate.setReplyQueue(replyQueue());
rabbitTemplate.setCorrelationKey(UUID.randomUUID().toString());
return rabbitTemplate;
}
@Bean
public Queue replyQueue() {
return new Queue(REPLY_QUEUE_NAME);
}
@Bean
public SimpleMessageListenerContainer messageListenerContainer() {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer(connectionFactory());
container.setQueueNames(QUEUE_NAME);
container.setMessageListener(messageListener());
return container;
}
@Bean
public MessageListener messageListener(){
return new RabbitListener();
}
}
I am trying to inject into the messagelistener which is created in the last lines a service from my project. This triggers an error of cannot autowire field as if the field is not managed by Spring. I did some research and I verified my component scan package and it's set to all the project, I have annotated the rabbitlistener with @Component so I can't really find the mistake or why Spring cannot autowire the field in my listener class. Here is the code.
@Component
public class RabbitListener implements MessageListener {
Logger logger = LoggerFactory.getLogger(this.getClass());
@Autowired
ImagesService imagesService;
@Override
public void onMessage(Message message) {
//processing message
}
Any ideas please?
Would be better if you'd share the full StackTrace, but I suggest you do something like this:
Add @ComponentScan
for your @Configuration
class and specify there those packages where are your RabbitListener
and ImagesService
classes
Mark the last two with @Component
(Yes, I see that on your RabbitListener
, but it isn't clear where your ImagesService
and how it is going around it)
Than @Autowire
RabbitListener
to that RabbitConfig
instead of @Bean
for it.
And be careful with the @Component
and @Bean
mix: you end up with two bean, if you have @ComponentScan
for that package, of course.
Okay, u need to @Autowire
the RabbitListener
bean. Since the RabbitListener
is a bean that need to be managed by the IOC, since is declared @Component
, hence @runtime the RabbitListener
is not in the context, hence autowire it in the config class like so
@Configuration
public class RabbitConfig {
@Bean
public ConnectionFactory connectionFactory() {
CachingConnectionFactory connectionFactory = new CachingConnectionFactory(HOST);
connectionFactory.setPort(CONN_PORT);
connectionFactory.setUsername(USERNAME);
connectionFactory.setPassword(PASSWORD);
return connectionFactory;
}
@Bean
public AmqpAdmin amqpAdmin() {
return new RabbitAdmin(connectionFactory());
}
@Bean
public RabbitTemplate rabbitTemplate() {
RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory());
rabbitTemplate.setReplyQueue(replyQueue());
rabbitTemplate.setCorrelationKey(UUID.randomUUID().toString());
return rabbitTemplate;
}
@Bean
public Queue replyQueue() {
return new Queue(REPLY_QUEUE_NAME);
}
@Bean
public SimpleMessageListenerContainer messageListenerContainer() {
SimpleMessageListenerContainer container = new SimpleMessageListenerContainer(connectionFactory());
container.setQueueNames(QUEUE_NAME);
container.setMessageListener(rabbitListener); // reference the autowired RabbitListener on this line
return container;
}
@Autowire
private RabbitListener rabbitListener;
}
That should resolve this error.
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