SpringBoot为什么要禁止循环依赖

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
@Component
class A {
    private final B b;
    @Autowired
    public A(B b) {
        this.b = b;
    }
    public void doSomething() {
        System.out.println("A is doing something with " + b);
    }
}
@Component
class B {
    private final A a;
    @Autowired
    public B(A a) {
        this.a = a;
    }
    public void doSomethingElse() {
        System.out.println("B is doing something else with " + a);
    }
}
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
@SpringBootApplication
public class CircularDependencyApplication implements CommandLineRunner {
    public static void main(String[] args) {
        SpringApplication.run(CircularDependencyApplication.class, args);
    }
    @Autowired
    private ApplicationContext context;
    @Override
    public void run(String... args) {
        // 举例调用 A 和 B 的方法
        A a = context.getBean(A.class);
        a.doSomething();
        B b = context.getBean(B.class);
        b.doSomethingElse();
    }
}