spring全注解开发出错

Question

package config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan("POJO")
public class SpringConfig2 {
}

package POJO;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Component;

@Component
public class Cat {
    public Cat() {
        System.out.println("testMod---cat");
    }
    public Cat(String arg){
        System.out.println(arg);
    }
}

上面是配置了和bean类，下面是测试类

public class Main {
    public static void main(String[] args) {
        AnnotationConfigApplicationContext context=new AnnotationConfigApplicationContext(SpringConfig2.class);
    }
}

项目结构如下

为什么会报错

Answer 1

错误原因是pom中加了

<properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>