如何解决hibernate查询java.lang.IllegalArgumentException：遍历的节点不能为null？

Question

我仍然无法解决这个问题，我看到很多答案都说有错误的语法，但我觉得没问题。我的hibernate版本为4.3.8.Final

这是我的程序

          String hql = "from　CardVoucher　c where c.businessId=:businessId";
                Map<String,Object> params = new HashMap<String,Object>();
                params.put("businessId", businessId);
                vouchers = voucherDao.find(hql, params, page, rows);

public List<T> find(String hql, Map<String, Object> params, int page, int rows) {
        Query q = this.getCurrentSession().createQuery(hql);
        if (params != null && !params.isEmpty()) {
            for (String key : params.keySet()) {
                q.setParameter(key, params.get(key));
            }
        }
        return q.setFirstResult((page - 1) * rows).setMaxResults(rows).list();
    }

Answer 1

您的hql无效：from　CardVoucher　c where c.businessId=:businessId应为select c from　CardVoucher　c where c.businessId=:businessId