問題排查之RocketMQAutoConfiguration not loaded.

背景

今天將一個SpringBoot項目的配置參數從原有的.yml文件遷移到Apollo後，啓動報錯

Bean method 'rocketMQTemplate' in 'RocketMQAutoConfiguration' not loaded because @ConditionalOnBean (types: org.apache.rocketmq.client.producer.DefaultMQProducer; SearchStrategy: all) did not find any beans of type org.apache.rocketmq.client.producer.DefaultMQProducer

花了兩個小時才最終搞清楚，緣由是缺乏了配置項 spring.rocketmq.producer.group 從而致使沒法成功建立RocketMQAutoConfiguration這個Bean，從而致使一連串對此有依賴的Bean沒法建立成功。

排查過程

啓動的錯誤日誌

2019-04-02 15:21:33.689  WARN 17516 --- [           main] s.c.a.AnnotationConfigApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myServiceAImpl': Unsatisfied dependency expressed through field 'myServiceBImpl'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'myServiceAImpl': Unsatisfied dependency expressed through field 'rocketMQTemplate'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.apache.rocketmq.spring.starter.core.RocketMQTemplate' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
2019-04-02 15:21:33.692  INFO 17516 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closed
2019-04-02 15:21:33.693  INFO 17516 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService
2019-04-02 15:21:33.693  INFO 17516 --- [           main] f.a.ReferenceAnnotationBeanPostProcessor : class com.alibaba.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor was destroying!
2019-04-02 15:21:33.702  INFO 17516 --- [           main] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2019-04-02 15:21:33.842 ERROR 17516 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Field rocketMQTemplate in net.yourpackage.myServiceBImpl required a bean of type 'org.apache.rocketmq.spring.starter.core.RocketMQTemplate' that could not be found.
    - Bean method 'rocketMQTemplate' in 'RocketMQAutoConfiguration' not loaded because @ConditionalOnBean (types: org.apache.rocketmq.client.producer.DefaultMQProducer; SearchStrategy: all) did not find any beans of type org.apache.rocketmq.client.producer.DefaultMQProducer


Action:

Consider revisiting the conditions above or defining a bean of type 'org.apache.rocketmq.spring.starter.core.RocketMQTemplate' in your configuration.

問題緣由

從上圖中能夠看到RocketMQAutoConfiguration中的mqProducer方法會根據配置參數來建立DefaultMQProducer，其中有兩個必要的參數

• spring.rocketmq.nameServer
• spring.rocketmq.producer.group

在從新檢查了一遍配置文件後發現，的確是由於漏掉了spring.rocketmq.producer.group，將其加上以後即可以成功啓動項目了。