为什么在我的案例中,上下文会创建bean?

你能告诉我为什么在我的案例中 "simple" bean是否有循环依赖关系?在我看来,必须抛出一个关于循环依赖性的异常! 配置类:

package config;

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

@Configuration
@ComponentScan(basePackages = "service")
public class AppConfig {
}

简单类:

package service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class Simple {

    @Autowired
    private Simple simple;


    public Simple getSimple() {
        return simple;
    }
}

发射器:

import config.AppConfig;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import service.Simple;


public class Launcher {

    public static void main(String[] args) {
        ApplicationContext ctx = new AnnotationConfigApplicationContext(AppConfig.class);
        Simple simple1 = ctx.getBean("simple", Simple.class);
        System.out.println(simple1.getSimple());
    }

}

应用程序的输出是“service.simple@6b53e23f”。如果我添加构造函数

@Autowired
public Simple(Simple simple) {
    this.simple = simple;
}

那是个例外 "Error creating bean with name 'simple': Requested bean is currently in creation: Is there an unresolvable circular reference?" 发生。

为什么我把豆子放在 @Autowired 在战场上?