Spring learn the error ____ 1.Type interface com.xbf.dao.UserDao is not known to the MapperRegistry.

UserMapper.xml did not write the file 

and is not configured mybatis core configuration files beans.xml (applicationContext.xml) files
 (Note: property namespace: write a corresponding interface) 
(Note: After writing Remember Register in the core configuration file ) 
associated configuration file: 
UserMapper.xml ---> the mybatis-config.xml-> applicationContext.xml 
*** naive to think that I can be omitted. . . . .