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src/main/java/io/renren/modules/admin/controller/PaperController.java

            return R.error("会议id不可为空");
        }
        paper.setCreateTime(new Date());
        boolean res = paperService.save(paper);
        if (!res) {
            return R.error("保存失败");
        try {
            paperService.save(paper);
        } catch (Exception e) {
            e.printStackTrace();
            return R.error(e.getMessage());
        }
        return R.ok();
    }
        if (paper.getAttendersId() == null || paper.getAttendersId() == 0L) {
            return R.error("参会名单id不能为空");
        }
        boolean res = paperService.updateById(paper);
        if (!res) {
            return R.error("保存失败");
        try {
            paperService.updateById(paper);
        } catch (Exception e) {
            e.printStackTrace();
            return R.error(e.getMessage());
        }
        return R.ok();
    }