[Spring] 添加@Async注解，导致spring启动失败[转载记录]

前言

在这篇文章里，最后总结处，我说了会讲讲循环依赖中，其中一个类添加@Async有可能会导致注入失败而抛异常的情况，今天就分析一下。

一、异常表现，抛出内容

1.1 循环依赖的两个class

1. CycleService1

@Service
public class CycleService1 {

    @Autowired
    private CycleService2 cycleService2;

    @WangAnno
    @Async
    public void doThings() {
        System.out.println("it's a async move");
    }

}

2. CycleService2

@Service
public class CycleService2 {

    private CycleService1 cycleService1;

    public void init() {

    }

    @WangAnno
    public void alsoDo() {
        System.out.println("create cycleService2");
    }

}

1.2 启动报错

Bean with name ‘cycleService1’ has been injected into other beans [cycleService2] in its raw version as part of a circular reference, but has eventually been wrapped. This means that said other beans do not use the final version of the bean.

解决方案

1. 延迟注入（使用@Lazy注解）

@Service
public class CycleService1 {

    @Lazy
    @Autowired
    private CycleService2 cycleService2;

    @WangAnno
    @Async
    public void doThings() {
        cycleService2.alsoDo();
        System.out.println("it's a async move");
    }

}

看过这篇文章的都知道原理了，此处不再累赘

2. 手动延迟注入（使用applicationContext.getBean）

@Service
public class CycleService1 {

    @Autowired
    private ApplicationContext applicationContext;

    private CycleService2 cycleService2;

    @WangAnno
    @Async
    public void doThings() {
        if (Objects.isNull(cycleService2)) {
            cycleService2 = applicationContext.getBean(CycleService2.class);
        }
        cycleService2.alsoDo();
        System.out.println("it's a async move");
    }

}

其实效果是上面加了@Lazy效果是一样的，不过是我们自己在方法执行的过程中手动进行延迟注入而已。
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版权声明：本文为CSDN博主「liangsheng_g」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/liangsheng_g/article/details/119976614