getHibernateTemplate()时null时不null(哭了)

LoginAction的execute()这里正常.
List list=studao.findByExample(loginForm);
ActionForward af=null;
if(list.size()>0)
{
Student stu=(Student)list.get(0);
System.out.println(stu.getStuId());
request.getSession().setAttribute("stuid", stu.getStuId());
af= mapping.findForward("selectCourse");
}
else
{
af=mapping.findForward("relogin");
}