mybatis报错： Error creating bean with name 'xxxDao'？

Question

mybatis报错：
Error creating bean with name 'xxxDao' defined in file [xxx]: cannot resolve reference to bean 'sqlSessionFactory' while setting bean property 'sqlSessionFactory'...
Error creating bean with name 'yyyDao' defined in file [xxx]: cannot resolve reference to bean 'sqlSessionFactory' while setting bean property 'sqlSessionFactory'...
Error creating bean with name 'zzzDao' defined in file [xxx]: cannot resolve reference to bean 'sqlSessionFactory' while setting bean property 'sqlSessionFactory'...

是一个老项目的新需求，我写完一个接口的一套mvc，把mymapper.xml添加到mybatis的config.xml以后就出现这个错误，主要是报错的'xxxDao''yyyDao' 都不是我写的，我也没动过。。。请问是哪里配置错了
 

Answer 1

数据库连接错误吧，注入对象失败。