如下写法报错  java.lang.IllegalArgumentException: argument type mismatch

		@At("/")
	@Ok("jsp:jsp.index")
	@RequiresUser
	public void index(@Attr(value="me", scope=Scope.SESSION)Integer uid,HttpServletRequest req) {
		if(uid!=null){
			User u = dao.fetch(User.class, uid);
			req.setAttribute("user", u);
		}
	}