背景介紹 最近把dubbo的版本從2.7.3升級到2.7.15時,遇到一個報錯 No application config found or it's not a valid config! ,對應的異常棧為: Caused by: java.lang.IllegalStateException: ...
背景介紹
最近把dubbo的版本從2.7.3升級到2.7.15時,遇到一個報錯 No application config found or it's not a valid config! ,對應的異常棧為:
Caused by: java.lang.IllegalStateException: No application config found or it's not a valid config! Please add <dubbo:application name="..." /> to your spring config. at org.apache.dubbo.config.utils.ConfigValidationUtils.validateApplicationConfig(ConfigValidationUtils.java:419) ~[dubbo-2.7.15.jar:2.7.15] at org.apache.dubbo.config.bootstrap.DubboBootstrap.checkGlobalConfigs(DubboBootstrap.java:539) ~[dubbo-2.7.15.jar:2.7.15] at org.apache.dubbo.config.bootstrap.DubboBootstrap.initialize(DubboBootstrap.java:525) ~[dubbo-2.7.15.jar:2.7.15] at org.apache.dubbo.config.ReferenceConfig.init(ReferenceConfig.java:244) ~[dubbo-2.7.15.jar:2.7.15] at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:206) ~[dubbo-2.7.15.jar:2.7.15] at org.apache.dubbo.config.spring.ReferenceBean.getObject(ReferenceBean.java:68) ~[dubbo-2.7.15.jar:2.7.15] at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:171) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:101) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1818) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getObjectForBeanInstance(AbstractAutowireCapableBeanFactory.java:1266) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:260) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeanByName(AbstractAutowireCapableBeanFactory.java:454) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:543) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:513) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:653) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:224) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:116) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessProperties(CommonAnnotationBeanPostProcessor.java:334) ~[spring-context-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1429) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:594) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:400) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1287) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1207) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:874) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:778) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:528) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1338) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1177) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:557) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:517) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:323) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:321) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.aop.framework.autoproxy.BeanFactoryAdvisorRetrievalHelper.findAdvisorBeans(BeanFactoryAdvisorRetrievalHelper.java:91) ~[spring-aop-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.aop.framework.autoproxy.AbstractAdvisorAutoProxyCreator.findCandidateAdvisors(AbstractAdvisorAutoProxyCreator.java:109) ~[spring-aop-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.aop.aspectj.annotation.AnnotationAwareAspectJAutoProxyCreator.findCandidateAdvisors(AnnotationAwareAspectJAutoProxyCreator.java:92) ~[spring-aop-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.aop.aspectj.autoproxy.AspectJAwareAdvisorAutoProxyCreator.shouldSkip(AspectJAwareAdvisorAutoProxyCreator.java:101) ~[spring-aop-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.aop.framework.autoproxy.AbstractAutoProxyCreator.postProcessBeforeInstantiation(AbstractAutoProxyCreator.java:251) ~[spring-aop-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1141) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.resolveBeforeInstantiation(AbstractAutowireCapableBeanFactory.java:1114) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:506) ~[spring-beans-5.2.0.RELEASE.jar:5.2.0.RELEASE] ... 12 more
其中,我們使用 Springboot 版本是2.2.0。
於是手動跟蹤調試了下,發現某些後置處理器執行時,在解決它的依賴時,會去創建 dubbo 服務的 bean,然後就會創建 ApplicationConfig 對象了。註意這個對象其實只是new了一下,所有屬性都是預設值,並非來源於我們定義的 dubbo 配置文件。
而我們定義的 dubbo 配置文件,是在 ApplicationConfig 中的 addIntoConfigManager 中註入的:
public abstract class AbstractConfig implements Serializable { ... @PostConstruct public void addIntoConfigManager() { ApplicationModel.getConfigManager().addConfig(this); } ... }
其中,@PostConstruct 註解會由 CommonAnnotationBeanPostProcessor 這個後置處理器(繼承自 InitDestroyAnnotationBeanPostProcessor)解析執行。但很遺憾,此時它還沒有被執行,因此也就沒有把正確的dubbo配置註入進去,最終導致dubbo框架在校驗時發現無效配置,繼而報錯。
網上相關討論及解決方案
關於這類報錯,網上也有不少討論,如:
簡單總結起來,由於dubbo沒有一個固定的初始化時機,而是與 ReferenceBean 等 dubbo 框架中的 beans 初始化相關。 如果它們被過早初始化,導致某些 BeanPostProcessor 尚未被執行,就會出現dubbo配置丟失的問題。
自然,dubbo官方也註意到了這個問題,於是在3.x版本進行了改造,針對該問題做了優化,參見Dubbo 3 Spring相關優化。
但3.x做了大量重構,如果我們不想升級,應該怎麼辦呢?
其實根據上面提到的原因,我們可以自己定義一個後置處理器,攔截 dubbo 框架的 beans,並手動註入對應的配置。本質上來說,將之前來不及執行的註入代碼提到前面去。這樣,我們前面提到的「某些後置處理器執行時,在解決它的依賴時,會去創建 dubbo 服務的 bean,然後就會創建 ApplicationConfig 對象了」,就變成了「某些後置處理器執行時,在解決它的依賴時,會去創建 dubbo 服務的 bean,此時會被我們自定義的後置處理器攔截,並註入對應的dubbo配置,然後就會創建正確的 ApplicationConfig 對象」。
具體做法為:
step1. 定義一個後置處理器,識別到 bean 屬於 AbstractConfig 配置後,將其註入:
package com.xxx; import org.apache.dubbo.config.AbstractConfig; import org.apache.dubbo.rpc.model.ApplicationModel; import org.springframework.beans.BeansException; import org.springframework.beans.factory.config.BeanPostProcessor; public class DubboBeanPostProcessor implements BeanPostProcessor { @Override public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException { if (bean instanceof AbstractConfig) { AbstractConfig abstractConfig = (AbstractConfig) bean; ApplicationModel.getConfigManager().addConfig(abstractConfig); } return BeanPostProcessor.super.postProcessAfterInitialization(bean, beanName); } }
step2. 定義一個 Initializer,並將剛纔定義的 DubboBeanPostProcessor 註入:
package com.xxx; import org.springframework.context.ApplicationContextInitializer; import org.springframework.context.ConfigurableApplicationContext; public class DubboApplicationContextInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> { @Override public void initialize(ConfigurableApplicationContext applicationContext) { applicationContext.getBeanFactory().addBeanPostProcessor(new DubboBeanPostProcessor()); } }
step3. 把 DubboApplicationContextInitializer 註入到Spring框架中,可以採用多種方式。
方式1. 直接在啟動類註入:
@ImportResource(locations = {"classpath:dubbo.xml"}) @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class}) public class Launcher extends SpringBootServletInitializer { public static void main(String[] args) { SpringApplication springApplication = new SpringApplication(Launcher.class); springApplication.addInitializers(new DubboApplicationContextInitializer()); springApplication.run(args); } }
方式2. 在 resources 的 META-INF 目錄下配置 spring.factories 文件並寫入:
org.springframework.context.ApplicationContextInitializer=com.xxx.DubboApplicationContextInitializer
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