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SpringCloud,SpringBoot,Mybatis整合时，启动项目，遇到一个错误：

2019-02-13 15:38:02.393  INFO 7512 --- [           main] ConditionEvaluationReportLoggingListener : Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.2019-02-13 15:38:02.395 ERROR 7512 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : ***************************APPLICATION FAILED TO START***************************Description:The bean 'dataSource', defined in BeanDefinition defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class], could not be registered. A bean with that name has already been defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class] and overriding is disabled.Action:Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=trueDisconnected from the target VM, address: '127.0.0.1:14424', transport: 'socket'Process finished with exit code 1

排查后发现是由于SpringCloud,SpringBoot的版本对应有问题，我原本的版本如下：

   		
    
     org.springframework.boot
    		
    
     spring-boot-starter-parent
    		
    
     2.1.2.RELEASE
    		
     
    	
   	
   
    com.java4all
   	
   
    user-server
   	
   
    0.0.1-SNAPSHOT
   	
   
    user-server
   	
   
    Demo project for Spring Boot
   	
   		
    
     1.8
    		
    
     Finchley.SR2
    	
   

springboot是2.1.2，springcloud是Finchley.SR2，这种对应是有问题的。后来在https://start.spring.io上生成时，当选择springboot版本为2.1.2时，官方新建的项目springcloud版本为Greenwich.RELEASE。建议新建项目时，使用此网站来创建，官方来匹配对应的依赖版本。

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