问无效的setter方法。setter的参数类型是否与getter的返回类型匹配？

EN

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-3.0.xsd">


  <context:component-scan base-package="com.swami.demo.springin5steps.xml"></context:component-scan>


 
  <bean id="twitterservice" class="com.swami.demo.springin5steps.xml.TwitterxmlService">
  
  </bean> 
  <bean id="Xmlmessageservice" class="com.swami.demo.springin5steps.xml.Xmlmessageservice">
        <property name="messageService" ref="twitterservice"></property>
  </bean>
  

</beans>

package com.swami.demo.springin5steps.xml;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.swami.demo.constructorbased.MessageService;

public class TwitterxmlService{
    private Logger logger=LoggerFactory.getLogger(TwitterxmlService.class);
    public void sendMessage(String msg) {
        // TODO Auto-generated method stub
        logger.info("TwitterService->{}",msg);
    }
    
}

package com.swami.demo.springin5steps.xml;

public class Xmlmessageservice {
    //private Logger logger=LoggerFactory.getLogger(Xmlmessageservice.class);
    public TwitterxmlService messageService;
    public Xmlmessageservice(TwitterxmlService messageService) {
        this.messageService=messageService;
    }
    
    public TwitterxmlService getMessageService() {
        return messageService;
    }

    public void message(String msg) {
        messageService.sendMessage(msg);
    }
}

package com.swami.demo.springin5steps;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import com.swami.demo.springin5steps.xml.Xmlmessageservice;

public class SpringIn5StepsXMLApplication {
        
    public static void main(String[] args) {
        ClassPathXmlApplicationContext applicationContext=new ClassPathXmlApplicationContext("applicationContext.xml");
        Xmlmessageservice xmessage=applicationContext.getBean(Xmlmessageservice.class);
        xmessage.message("hi");
        applicationContext.close();
        
    }
        
}