Spring Boot v2.7.6中抽象类引发的循环引用问题求助

问题根源 #

你的抽象类在@PostConstruct方法中通过ApplicationContext.getBean(this.getClass())获取自身实例，此时Bean尚未完成初始化流程，触发了Spring Boot 2.7.x更严格的循环依赖检测机制。

方案1：移除冗余的me字段（最优解） #

代码中me.perform(request)完全等价于this.perform(request)——this本身就是子类实例，抽象方法perform会由子类实现。无需额外通过ApplicationContext获取自身，直接简化代码即可消除循环引用：

public abstract class AbstractTransactionalService<Request, Response, Exception> {

    public Response performService(final Request request, final Class<Exception> exceptionClass)
            throws Exception {
        try {
            final Response response = this.perform(request);
            return response;
        } catch (final Exception e) {
            // 保留原异常处理逻辑
            ...
        }
    }

    public abstract Response perform(Request request) throws Exception;
}

该方案彻底消除了循环引用触发点，代码更简洁，是优先选择的解决方案。

方案2：若需获取代理对象（如子类带@Transactional） #

如果子类使用@Transactional等需要Spring代理的注解，直接用this调用perform会绕过代理（无法触发事务），此时可通过以下方式安全获取代理实例：

子方案2.1：通过@Autowired注入自身 #

Spring支持Bean自注入，直接在抽象类中注入自身实例，无需手动从ApplicationContext获取：

public abstract class AbstractTransactionalService<Request, Response, Exception> {

    @Autowired
    private AbstractTransactionalService<Request, Response, Exception> me;

    public Response performService(final Request request, final Class<Exception> exceptionClass)
            throws Exception {
        try {
            final Response response = this.me.perform(request);
            return response;
        } catch (final Exception e) {
            ...
        }
    }

    public abstract Response perform(Request request) throws Exception;
}

子方案2.2：监听上下文刷新事件 #

在Spring上下文完全初始化后再获取代理实例，避免初始化过程中的循环问题：

public abstract class AbstractTransactionalService<Request, Response, Exception> implements ApplicationListener<ContextRefreshedEvent> {

    @Autowired
    private ApplicationContext applicationContext;

    private AbstractTransactionalService<Request, Response, Exception> me;

    @Override
    public void onApplicationEvent(ContextRefreshedEvent event) {
        // 上下文完全刷新后再获取bean，避免重复执行可添加上下文判断
        if (event.getApplicationContext().getParent() == null) {
            me = applicationContext.getBean(this.getClass());
        }
    }

    public Response performService(final Request request, final Class<Exception> exceptionClass)
            throws Exception {
        try {
            final Response response = this.me.perform(request);
            return response;
        } catch (final Exception e) {
            ...
        }
    }

    public abstract Response perform(Request request) throws Exception;
}

内容的提问来源于stack exchange，提问作者phildeg31