【異常】The dependencies of some of the beans in the application context form a cycle

一、異常出現場景以及異常信息

場景：SpringBoot中自定義DataSource數據源

異常信息：

2019-11-21 14:27:30.807 ERROR 5662 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

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

Description:

The dependencies of some of the beans in the application context form a cycle:

   userServiceImpl (field com.zbq.springbootdemo.dao.UserDao com.zbq.springbootdemo.service.UserServiceImpl.userDao)
      ↓
   userDao defined in file [/Users/zhangboqing/Software/MyGithub/spring-boot-demo/target/classes/com/zbq/springbootdemo/dao/UserDao.class]
      ↓
   sqlSessionFactory defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]
┌─────┐
|  dynamicDataSource defined in class path resource [com/zbq/springbootdemo/config/multidatasource/DataSourceConfig.class]
↑     ↓
|  primary defined in class path resource [com/zbq/springbootdemo/config/multidatasource/DataSourceConfig.class]
↑     ↓
|  org.springframework.boot.autoconfigure.jdbc.DataSourceInitializerInvoker

 

二、解決方案

排除Spring Boot數據源自動配置類

// 自定義數據源一定要排除SpringBoot自動配置數據源，不然會出現循環引用的問題，The dependencies of some of the beans in the application context form a cycle
@EnableAutoConfiguration(exclude = {DataSourceAutoConfiguration.class})