hibernate+struts测试登录功能!

HTTP Status 404 – Not Found

Type Status Report

Message No result defined for action action.UsersAction and result login_success

Description The origin server did not find a current representation for the target resource or is not willing to disclose that one exists.

我输入错的帐号密码是返回登录界面的，但是输入正确的是404错误，怎么破啊？