t_user is not mapped [from t_user as u where u.loginname = :loginname and u.password =:password]

转自：https://blog.csdn.net/u010876380/article/details/52714539

错误：

Struts Problem Report

Struts has detected an unhandled exception:

Messages:	t_user is not mapped [from t_user as u where u.loginname = :loginname and u.password =:password]
File:	org/hibernate/hql/ast/util/SessionFactoryHelper.java
Line number:	181

原因：hibernate 使用的是hql语句而不是sql语句，from t_user中的t_user应该是实体类而不是数据库中的表。我把t_user更改成写的实体类User就不在报错了。