mybatis出错Error parsing Mapper XML Error parsing Mapper XML Cannot find class

org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.

### The error may exist in com/mybatis/test5/ClassesMapper.xml 

### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.lang.RuntimeException: Error parsing Mapper XML. Cause: org.apache.ibatis.builder.BuilderException: Error resolving class . Cause: org.apache.ibatis.type.TypeException: Could not resolve type alias 'Classes'.  Cause: java.lang.ClassNotFoundException: Cannot find class: Classes

ClassesMapper.xml中

   SELECT * FROM class WHERE c_id=#{id};

resultType="Classes"应该写包含路径的全类名 resultType="com.mybatis.test5.Classes"