记录一下Spring Boot使用MyBatis时项目启动报错问题

 

刚开始启动项目时，报错如下：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2020-10-06 23:26:55.263 ERROR 29072 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter : *************************** APPLICATION FAILED TO START *************************** Description: Failed to configure a DataSource: no embedded datasource could be configured. Reason: Failed to determine a suitable driver class Action: Consider the following: If you want an embedded database (H2, HSQL or Derby), please put it on the classpath. If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active). Process finished with exit code 1

 后面在网上查找了一些方法：

1.@SpringBootApplication后面加(scanBasePackages = "com.myBatisDemo.myuBatis")

2.加上@MapperScan(value = "com.myBatisDemo.myuBatis.UserMapper")

但是后面仍然报错：

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled. 2020-10-06 23:22:28.590 ERROR 22096 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter : *************************** APPLICATION FAILED TO START *************************** Description: Field userMapper in com.myBatisDemo.myuBatis.MainController required a bean of type 'com.myBatisDemo.myuBatis.UserMapper' 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 'com.myBatisDemo.myuBatis.UserMapper' in your configuration. Process finished with exit code 1

后面因为找了很多方法都不能解决，所以我重新创建了一个项目，按照之前能够运行成功的一个项目进行配置，最后找出了我的问题是在application.properties的数据库连接的配置中：

 运行失败的application.properties：

#1.项目启动的端口号 server.port=8088 spring.datasource.url=jdbc.url=jdbc:mysql://localhost:3306/mybatis?serverTimezone=UTC spring.datasource.username=xxx spring.datasource.password=xxx

 运行成功的application.properties： 

#1.项目启动的端口号 server.port=8088 spring.datasource.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC spring.datasource.username=xxx spring.datasource.password=xxx

最后终于启动成功，所以出现这样的问题有可能是application.properties里面配置的参数有问题。这是我自己遇到的问题，但是并不是所以的这类问题都是这样解决，如果你的问题和我的一样，希望能够帮助到你。

 

另外在解决这个问题后，我还遇到了一个MyBatis的问题：org.apache.ibatis.binding.BindingException: Invalid bound statement (not found)，也是尝试了各种解决办法都没有解决。

刚开始我的UserMapper接口和UserMapper.xml的目录结构如下：

后面改成了下面，成功解决问题。所以Mapper接口和resource下的Mapper.xml对应的包名一定要相同，否则很可能找不到对应的Mapper.xml文件。

 

另外在创建 com.mybatisDemo.myuBatis文件要注意，要按下面的形式创建：

最后完美运行项目：

 

希望能帮助大家解决跟我一样的问题。