if (teacherID == -1) { teacherID = null; }  preparePageData(request, userView, form, executionYearID, teacherID);  return mapping.findForward("showTeacherExpectations");
return mapping.findForward("showTeacherExpectations");
    public ActionForward changeTeacher(ActionMapping mapping, ActionForm form,            HttpServletRequest request, HttpServletResponse response) throws Exception {        Integer executionYearID = (Integer) ((DynaActionForm) form).get("executionYearID");        Integer teacherID = (Integer) ((DynaActionForm) form).get("teacherID");        IUserView userView = SessionUtils.getUserView(request);        if (teacherID == -1) {            teacherID = null;        }        preparePageData(request, userView, form, executionYearID, teacherID);        return mapping.findForward("showTeacherExpectations");    }