帮忙看看这个是什么错误啊
failed to lazily initialize a collection of role: xmu.software.wedo.teacherSys.entity.Teacher.courses, no session or session was closed

[解决办法]
你是不是在JSP中引用到了相关的collection是lazy initialized的?
看看这个:http://www.blogjava.net/vince/archive/2006/11/27/83850.html