spring 启动 rabbitmq RabbitTemplate 错误

Question

I am taking the error that "Could not autowire. No beans of 'RabbitTemplate' type found". I normally try to autowired RabbitTemplate to my producer class but it gives like that error.

i tried to solve creating bean in configuration file. but it did not work.

package com.example.rabbitmqexample.producer;

import com.example.rabbitmqexample.model.Notification;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;

@Service
public class NotificationProducer {

    @Value("${sr.rabbit.routing.name}")
    private String routingName;

    @Value("${sr.rabbit.exchange.name}")
    private String exchangeName;

    @Autowired
    private RabbitTemplate rabbitTemplate;

    public void sendToQueue(Notification notification){
        System.out.println("Notification Sent ID: "+notification.getNotificationId());
        rabbitTemplate.convertAndSend(exchangeName,routingName,notification);
    }
}

Answer 1

As exception suggest there is no instance of RabbitTemplate with in IOC container, thus it can not be inject on other bean declarations like 'NotificationProducer' class.

You said

i tried to solve creating bean in configuration file. but it did not work.

Solution

proper bean declaration for RabbitTemplate , with respecting constructor and dependent bean binding they are many ways to do that. one practice to proper bean declaration with ConnectionFactory as a dependent bean for RabbitTemplate is as follow.

@EnableRabbit
@Configuration
public class RabbitMQConfiguration {

    ...

    @Bean
    public RabbitTemplate rabbitTemplate(ConnectionFactory connectionFactory){
        RabbitTemplate rabbitTemplate = new RabbitTemplate(connectionFactory);
        //adding perhaps some extra confoguration to template like message convertor. etc.
        ...
        return rabbitTemplate;
    }
}

Always check the version docs depending the artifact version you are using for compatibility.