Property path [...] does not reference a collection

criteria.add(Restrictions.or(Restrictions.ne("isCancelled", null), Restrictions.isNull("isCancelled")));
在使用hiberante查询时，“isCancelled” 字段的值可能为空值，使用isEmpty（propertyName）、isNull（propertyName）都会报Property path [...] does not reference a collection异常，将为空的查询改为 Property.forName("isCancelled").isNull()即：
criteria.add(Restrictions.or(Restrictions.ne("isCancelled", null), Property.forName("isCancelled").isNull()));
ok，搞定了。