dubbo无法获取apollo配置

最近在用 springboot + dubbo + apollo搭建模块时碰到一个问题

问题描述

` [main] ERROR o.s.boot.SpringApplication - Application run failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘referenceConfig’ defined in class path resource [xxx.xxxx.middleware/DubboConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [xxx.xxx.client.CasRpc]: Factory method ‘referenceConfig’ threw exception; nested exception is java.lang.IllegalStateException: No application config found or it’s not a valid config! Please add to your spring config. at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:655) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:483) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(Abstr actAutowireCapableBeanFactory.java:1336) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowire CapableBeanFactory.java:1176) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapabl eBeanFactory.java:556) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableB eanFactory.java:516) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry .java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBea nFactory.java:897) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicati onContext.java:879) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicat ionContext.java:141) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) at com.bluewhale.message.server.Application.main(Application.java:21) Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [xxx.xxx.client.CasRpc]: Factory method ‘referenceConfig’ threw exception; nested exception is java.lang.IllegalStateException: No application config found or it’s not a valid config! Please add to your spring config. at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:650) … 19 common frames omitted Caused by: java.lang.IllegalStateException: No application config found or it’s not a valid config! Please add to your spring config. at org.apache.dubbo.config.AbstractInterfaceConfig.checkApplication(AbstractInterfaceConfig.java:216) at org.apache.dubbo.config.ReferenceConfig.checkAndUpdateSubConfigs(ReferenceConfig.java:239) at org.apache.dubbo.config.ReferenceConfig.get(ReferenceConfig.java:244) ………

原因分析

我的程序启动过程，首先是在spring interceptor中加载一个拦截器，这个拦截器中引用一个dubbo consume class。所以有 dubbo config 类中加载这个class。

分析这个原因应该是dubbo config类启动是没有读取到配置信息。为分析这个过程，我做了几个动作

将dubbo的配置类和 intercepor注释掉。可以成功启动，也可以读取到apollo中关于dubbo的配置（ps：spring boot是按照约定大于配置原则来的，所以如果配置了 dubbo.application.name 则是可以读取到的）
改名dubbo.application.name 改为 application.name 则读取不到程序启动后还是会出现上面的问题。网上搜索发现这篇文章。 Spring Boot接入 apollo 后启动 dubbo 报错解决的核心 “1.2.0版本已经发布，支持把Apollo配置加载提到初始化日志系统之前，可以解决此issue中提到的问题 “ 具体落实到配置就是 apollo.bootstrap.eagerLoad.enabled=true

dubbo spring 代码

org.apache.dubbo.spring.boot.context.event.OverrideDubboConfigApplicationListener

代码中

line 61:

if (override) {

      SortedMap<String, Object> dubboProperties = filterDubboProperties(environment);

      ConfigUtils.getProperties().putAll(dubboProperties);

      if (logger.isInfoEnabled()) {
          logger.info("Dubbo Config was overridden by externalized configuration {}", dubboProperties);
      }
  } else {
      if (logger.isInfoEnabled()) {
          logger.info("Disable override Dubbo Config caused by property {} = {}", OVERRIDE_CONFIG_FULL_PROPERTY_NAME, override);
      }
  }

方法 filterDubboProperties

public static SortedMap<String, Object> filterDubboProperties(ConfigurableEnvironment environment) {

  SortedMap<String, Object> dubboProperties = new TreeMap<>();

  Map<String, Object> properties = EnvironmentUtils.extractProperties(environment);

  for (Map.Entry<String, Object> entry : properties.entrySet()) {
      String propertyName = entry.getKey();

      if (propertyName.startsWith(DUBBO_PREFIX + PROPERTY_NAME_SEPARATOR)
              && entry.getValue() != null) {
          dubboProperties.put(propertyName, entry.getValue().toString());
      }

  }

  /**
    * The prefix of property name of Dubbo
    */
   public static final String DUBBO_PREFIX = "dubbo";

所以到这里就很清晰的明白，所有dubbo配置一定要以 dubbo作为前缀

补充

整合springboot 和线程池 https://www.jianshu.com/p/3d875dd9d5db

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