我们定义一个简单的例子 
@Service
public class ServiceA implements ServiceAInterface {
    private final ServiceBInterface serviceB;

    public ServiceA(ServiceBInterface serviceB) {
        this.serviceB = serviceB;
    }
}


@Service
public class ServiceB implements ServiceBInterface {
    private final ServiceAInterface serviceA;

    public ServiceB(ServiceAInterface serviceA) {
        this.serviceA = s...