Springboot引入JPA，出现a bean named 'entityManagerFactory' that could not be found

*************************** APPLICATION FAILED TO START *************************** Description: Field usuarioDao in es.uc3m.tiw.Controladores.Controlador required a bean named 'entityManagerFactory' that could not be found. Action: Consider defining a bean named 'entityManagerFactory' in your configuration.

由于是以前的项目, 如今报错, 网上说的删除maven仓库hibernate下的包, 试了也没用; 后来想是否是springboot版本问题,

因而在pom.xml文件中将

springboot的版本从

<version>2.1.1.RELEASE</version>

改为

<version>2.1.4.RELEASE</version>

项目便可运行...

  

另一个错误

*************************** APPLICATION FAILED TO START *************************** Description: Field roleRepository in top.wujinxing.ch15jpa.controller.RoleController required a bean of type 'top.wujinxing.ch15jpa.dao.RoleRepository' that could not be found. The injection point has the following annotations: - @org.springframework.beans.factory.annotation.Autowired(required=true) Action: Consider defining a bean of type 'top.wujinxing.ch15jpa.dao.RoleRepository' in your configuration. Process finished with exit code 1

须要在项目入口添加

@ComponentScan(basePackages = "top.wujinxing.ch15jpa.dao")