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