save时报错:not-null property references a null or transient value

小弟最近做一个权限分配,在保存权限时发生异常！找不到问题所在,请各位大虾帮帮忙！

错误：org.springframework.dao.DataIntegrityViolationException: not-null property references a null or transient value: org.struts_hibernate_spring.entity.UserRoleRight.userRight; nested exception is org.hibernate.PropertyValueException: not-null property references a null or transient value: org.struts_hibernate_spring.entity.UserRoleRight.userRight

// 用户权限HBM映射文件
<hibernate-mapping>
<class name="org.struts_hibernate_spring.entity.UserRole" table="user_role" catalog="database">
<id name="roleId" type="java.lang.Integer">
<column name="role_id" />
<generator class="native" />
</id>
<property name="roleName" type="java.lang.String">
<column name="role_name" length="20" not-n

老是出现 can not save config 是怎么回事？ 硬盘检测时报错 系统启动时报错 打开计算器时报错!!! 电脑开机时报错 安装daemon_tools时报错 开机时报错 进入桌面时报错！ informix server has not been set.Save anyway?什么意思？ Can I not save you?这句话对不对