springboot由于bean加载顺序导致的问题

先记录现象：

dubbo整合zipkin时，我的配置文件是这样的

@Bean("okHttpSender")
    public OkHttpSenderFactoryBean okHttpSender(){
        OkHttpSenderFactoryBean okHttpSenderFactoryBean = new OkHttpSenderFactoryBean();
        //zipkin服务端
        okHttpSenderFactoryBean.setEndpoint("http://localhost:9411/api/v2/spans");
        return okHttpSenderFactoryBean;
    }

    @Bean
    public AsyncReporterFactoryBean reporter(@Qualifier("okHttpSender")OkHttpSender sender){
        AsyncReporterFactoryBean asyncReporterFactoryBean = new AsyncReporterFactoryBean();
        asyncReporterFactoryBean.setSender(sender);
        asyncReporterFactoryBean.setCloseTimeout(1000);
        return asyncReporterFactoryBean;
    }

    @Bean("tracing")
    public TracingFactoryBean tracingFactoryBean(@Qualifier("reporter") Reporter reporter) throws Exception {
        TracingFactoryBean tracingFactoryBean = new TracingFactoryBean();
        tracingFactoryBean.setLocalServiceName("rcinvestTracing");
        tracingFactoryBean.setSpanReporter(reporter);
        CurrentTraceContextFactoryBean currentTraceContextFactoryBean = new CurrentTraceContextFactoryBean();
        CurrentTraceContext.ScopeDecorator scopeDecorator = MDCScopeDecorator.create();
        currentTraceContextFactoryBean.setScopeDecorators(Arrays.asList(scopeDecorator));
        tracingFactoryBean.setCurrentTraceContext(currentTraceContextFactoryBean.getObject());
        return tracingFactoryBean;
    }

结果提示自动注入没有发现reporter

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'zipkin2.reporter.Reporter<?>' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Qualifier(value=reporter)}

然后我改了一下

 public TracingFactoryBean tracingFactoryBean(@Qualifier("reporter") Reporter reporter) throws Exception
改为:
 public TracingFactoryBean tracingFactoryBean(@Qualifier("reporter") AsyncReporterFactoryBean reporter) throws Exception

又提示循环注入：

Requested bean is currently in creation: Is there an unresolvable circular reference?

虽然通过源码发现了导致问题的源码，但是我也不知道具体是什么原因导致的问题

最后通过修改bean加载的顺序，上述俩个问题都解决了

@Bean("tracing")
    public TracingFactoryBean tracingFactoryBean(@Qualifier("reporter") AsyncReporter reporter) throws Exception {
        TracingFactoryBean tracingFactoryBean = new TracingFactoryBean();
        tracingFactoryBean.setLocalServiceName("rcinvestTracing");
        tracingFactoryBean.setSpanReporter(reporter);
        CurrentTraceContextFactoryBean currentTraceContextFactoryBean = new CurrentTraceContextFactoryBean();
        CurrentTraceContext.ScopeDecorator scopeDecorator = MDCScopeDecorator.create();
        currentTraceContextFactoryBean.setScopeDecorators(Arrays.asList(scopeDecorator));
        tracingFactoryBean.setCurrentTraceContext(currentTraceContextFactoryBean.getObject());
        return tracingFactoryBean;
    }

    @Bean
    public AsyncReporterFactoryBean reporter(@Qualifier("okHttpSender")OkHttpSender sender){
        AsyncReporterFactoryBean asyncReporterFactoryBean = new AsyncReporterFactoryBean();
        asyncReporterFactoryBean.setSender(sender);
        asyncReporterFactoryBean.setCloseTimeout(1000);
        return asyncReporterFactoryBean;
    }

    @Bean("okHttpSender")
    public OkHttpSenderFactoryBean okHttpSender(){
        OkHttpSenderFactoryBean okHttpSenderFactoryBean = new OkHttpSenderFactoryBean();
        //zipkin服务端
        okHttpSenderFactoryBean.setEndpoint("http://localhost:9411/api/v2/spans");
        return okHttpSenderFactoryBean;
    }

猜测：父级bean放在上面加载，需要注入的bean，放在下面加载是不是就能就觉问题