报错信息：
org.springframework.context.support.AbstractApplicationContext refresh 警告: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [application.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'class path resource [mybatis/mapper/Studentmapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'class path resource [mybatis/mapper/Studentmapper.xml]'. Cause: java.lang.IllegalArgumentException: Mapped Statements collection already contains value for com.wingchi.Dao.StudentDao.findStuById. please check mybatis/mapper/Studentmapper.xml and class path resource [mybatis/mapper/Studentmapper.xml] Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [application.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: 'class path resource [mybatis/mapper/Studentmapper.xml]'; nested exception is org.apache.ibatis.builder.BuilderException: Error parsing Mapper XML. The XML location is 'class path resource [mybatis/mapper/Studentmapper.xml]'. Cause: java.lang.IllegalArgumentException: Mapped Statements collection already contains value for com.wingchi.Dao.StudentDao.findStuById. please check mybatis/mapper/Studentmapper.xml and class path resource [mybatis/mapper/Studentmapper.xml]
网上很多资料说是方法mybatis映射重名
在Spring配置文件中会配置sqlSessionFactory,一般配置如下：
然后编写mybatis的配置文件：
mybatis-config.xml
查来查去最后发现，其实Spring配置文件中的:
和mybatis文件中的 ：
指向的是同一个文件，所以如果两边都配置了，相当于重复配置，就会报错。
所以，随便将其中一处删掉就好了。
