Description:

The bean 'dubboConfigConfiguration.Single', defined in null, could not be registered. A bean with that name has already been defined in null and overriding is disabled.

Action:

Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true

后來經(jīng)過嘗試，把springboot的版本下調(diào)到2.0.9時候，項目可以正常啟動。

所以得到下面這個版本匹配的結(jié)論：

2.7版本以下的，使用的是alibaba目錄下的jar,

springbootdubbo-springdubbo注1.x0.1.2.RELEASE2.6.5+2.6.6以上的dubbo需要配置netty-alljar包2.0.0~2.0.90.2.1.RELEASE2.6.5/2.6.6/2.6.72.1.x0.2.1.RELEASE2.6.5 /2.7.1

2.7版本以上的，用apache目錄下面的jar，dubbo-spring和dubbo都使用apache下面的版本，統(tǒng)一使用2.7即可，springboot也可以用2.1.x以上

springboot+dubbo版本對應(yīng)關(guān)系

背景

springboot 和 dubbo 在 pom.xml 中的版本是有對應(yīng)關(guān)系的，如果配置的依賴不按照對應(yīng)關(guān)系配置的話項目啟動就會報錯，報錯的信息如下所示：

java.lang.IllegalStateException: Cannot load configuration class: com.alibaba.boot.dubbo.autoconfigure.DubboAutoConfiguration
at org.springframework.context.annotation.ConfigurationClassPostProcessor.enhanceConfigurationClasses(ConfigurationClassPostProcessor.java:403) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.context.annotation.ConfigurationClassPostProcessor.postProcessBeanFactory(ConfigurationClassPostProcessor.java:249) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:283) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.context.support.PostProcessorRegistrationDelegate.invokeBeanFactoryPostProcessors(PostProcessorRegistrationDelegate.java:127) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:687) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:525) ~[spring-context-4.3.12.RELEASE.jar:4.3.12.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.8.RELEASE.jar:1.5.8.RELEASE]
at com.ProviderApplication.main(ProviderApplication.java:13) [classes/:na]

對應(yīng)關(guān)系

我在項目中使用的阿里巴巴的 dubbo-spring-boot-starter 版本是 0.2.0 ，maven 依賴如下所示：

<dependency>
    <groupId>com.alibaba.boot</groupId>
    <artifactId>dubbo-spring-boot-starter</artifactId>
    <version>0.2.0</version>
</dependency>

則對應(yīng)的使用 spring-boot-starter-parent 的版本號是 2.1.6.RELEASE ，這樣配置依賴的話，項目啟動是沒有問題的。