rocketmq消费者消费到消息但对象为空

在使用rocketmq时生产者发送消息，消息是一个对象
消费者消费到的时候对象内容为空

//在把接受到的对象发送时，对象属性都有
@RequestMapping("message")
    public void sendMessage(@RequestBody ProducerEntity producerEntity) {
    
    
        Message message = new Message("my-topic",JSON.toJSONString(producerEntity).getBytes());
        rocketMQTemplate.syncSend("my-topic:tag1",message);
    }

@Component
@RocketMQMessageListener(topic = "my-topic",consumerGroup = "my-group",selectorExpression = "tag1")
public class Consumer implements RocketMQListener<ProducerEntity>{
    
    

    @Autowired
    SystemConsumerFeign systemConsumerFeign;

    @Override
    public void onMessage(ProducerEntity producerEntity) {
    
    
    //消费者消费时对象内容为空
        systemConsumerFeign.sendMessage(producerEntity);
    }
}

后来在生产者使用了

rocketMQTemplate.convertAndSend("my-topic:tag1",producerEntity);

就可以了，应该是这个方法发送的是实体，而上边的方法为字节，所以接收不到