mybatis获取list时，分页失败

@RequestMapping(value="/t9a_project_asmRepoApprovalList.ajax",method=RequestMethod.POST)
    @ResponseBody
    @Paging
    public PageInfo<T9a_project_asmrepoDTO> t9a_project_asmRepoApprovalList(T9a_project_asmrepoDTO t9a_project_asmrepo){
        //String s = String.valueOf(getT99_user().getUser_id());
        //t9a_project_asmrepo.setAssignee(s);
        List<T9a_project_asmrepoDTO> list = t9a_project_asmrepoServiceI.getT9a_project_asmRepoApprovalList(t9a_project_asmrepo);
        PageInfo<T9a_project_asmrepoDTO> pageinfo = MyBatisPageHelper.getPageInfo(list);
        return pageinfo;
    }