2025-05-02T22:15:19.039+08:00 WARN 27128 --- [mpdemo] [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userMapper' defined in file [D:\backend\Java\project\springboot-vue_exercise\mpdemo\target\classes\com\yyb\mapper\UserMapper.class]: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required
2025-05-02T22:15:19.039+08:00 INFO 27128 --- [mpdemo] [ main] com.alibaba.druid.pool.DruidDataSource : {dataSource-0} closing ...
2025-05-02T22:15:19.041+08:00 INFO 27128 --- [mpdemo] [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2025-05-02T22:15:19.055+08:00 INFO 27128 --- [mpdemo] [ main] .s.b.a.l.ConditionEvaluationReportLogger :
Error starting ApplicationContext. To display the condition evaluation report re-run your application with 'debug' enabled.
2025-05-02T22:15:19.064+08:00 ERROR 27128 --- [mpdemo] [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userMapper' defined in file [D:\backend\Java\project\springboot-vue_exercise\mpdemo\target\classes\com\yyb\mapper\UserMapper.class]: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1818) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:607) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:529) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:339) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:371) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:337) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.instantiateSingleton(DefaultListableBeanFactory.java:1215) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingleton(DefaultListableBeanFactory.java:1187) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:1122) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:987) ~[spring-context-6.2.6.jar:6.2.6]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:627) ~[spring-context-6.2.6.jar:6.2.6]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.4.5.jar:3.4.5]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:753) ~[spring-boot-3.4.5.jar:3.4.5]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:439) ~[spring-boot-3.4.5.jar:3.4.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:318) ~[spring-boot-3.4.5.jar:3.4.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1362) ~[spring-boot-3.4.5.jar:3.4.5]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1351) ~[spring-boot-3.4.5.jar:3.4.5]
at com.yyb.mpdemo.MpdemoApplication.main(MpdemoApplication.java:12) ~[classes/:na]
Caused by: java.lang.IllegalArgumentException: Property 'sqlSessionFactory' or 'sqlSessionTemplate' are required
at org.springframework.util.Assert.notNull(Assert.java:181) ~[spring-core-6.2.6.jar:6.2.6]
at org.mybatis.spring.support.SqlSessionDaoSupport.checkDaoConfig(SqlSessionDaoSupport.java:122) ~[mybatis-spring-2.0.5.jar:2.0.5]
at org.mybatis.spring.mapper.MapperFactoryBean.checkDaoConfig(MapperFactoryBean.java:73) ~[mybatis-spring-2.0.5.jar:2.0.5]
at org.springframework.dao.support.DaoSupport.afterPropertiesSet(DaoSupport.java:44) ~[spring-tx-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1865) ~[spring-beans-6.2.6.jar:6.2.6]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1814) ~[spring-beans-6.2.6.jar:6.2.6]
... 18 common frames omitted
Process finished with exit code 1
报错原因，依赖配置有问题，
如果用的boot3，依赖要改成mybatis-plus-spring-boot3-starter
还有个问题
主启动类应在顶级包（如com.yyb）
JDBC连接数据库出现Loading class `com.mysql.jdbc.Driver'. This is deprecated.问题的相关解决方法
Loading class com.mysql.jdbc.Driver'. This is deprecated. The new driver class iscom.mysql.cj.jdbc.Driver’. The driver is automatically registered via the SPI and manual loading of the driver class is generally unnecessary.
解决办法：
将driver-class-name改为 com.mysql.cj.jdbc.Driver
