请问这段代码的问题出现在哪里

Question

如图所示异常
代码：

public interface HutaoDao {
    public  void  save();
}
public class HutaoDaoImpl implements HutaoDao{
    private  HutaoDao hutaoDao = new HutaoDaoImpl();
    public  void save(){
        System.out.println("打雷啦，起身啦");
        hutaoDao.save();

    }
}

public interface HutaoService {
    public void save();
}
public class HutaoServiceImpl implements HutaoService {

    public  void  save(){
        System.out.println("再会啦");

    }
}
xml配置：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       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.xsd">

    <bean id="hutaoDao" class="com.mihoyo.dao.impl.HutaoDaoImpl"/>
<bean id="hutaoService" class="com.mihoyo.dao.impl.service.impl.HutaoServiceImpl"/>
</beans>

pom配置：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mihoyo</groupId>
    <artifactId>Spring---yuanshen1</artifactId>
    <version>1.0-SNAPSHOT</version>

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.13.1</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>5.3.22</version>
    </dependency>
</dependencies>
</project>

Answer 1

你这两行代码有问题
public class HutaoDaoImpl implements HutaoDao{
private HutaoDao hutaoDao = new HutaoDaoImpl();
怎么能自己new自己，然后再自己引用自己再new自己呢，这样无限循环导致堆栈溢出了哇
改成这样：

public interface HutaoDao {
    public  void  save();
}
public class HutaoDaoImpl implements HutaoDao{
    public  void save(){
        System.out.println("打雷啦，起身啦");
    }
}

然后在你需要调用的地方去new，然后调用

HutaoDao hutaoDao = new HutaoDaoImpl();
hutaoDao.save();