org.hibernate.id.IdentifierGenerationException: attempted to assign id from null

org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property: organ
一对一双向关联 在同一个jsp页面向两个数据库添加数据时报这个异常 会的帮忙解决下 琢磨了一下午了 配置文件 organ_detail配置文件
  <class name="com.softeem.entity.OrganDetail" table="organ_detail" schema="dbo" catalog="liutao" >
        <id name="odId" type="java.lang.Integer">
            <column name="od_id" />
            <generator class="foreign" >
            <param name="property">organ</param>
            </generator>
        </id>
        <one-to-one name="organ" class="com.softeem.entity.Organ" lazy="false" cascade="all" constrained="true"
organ配置问价
 <class name="com.softeem.entity.Organ" table="organ" schema="dbo" catalog="liutao" lazy="false" >
        <id name="organId" type="java.lang.Integer">
            <column name="organ_id" />
            <generator class="native" />
        </id>jsp页面：
<body bgcolor="#fef4d9">
   <h1 align="center">添加部门信息</h1>
   <s:form action="OrganAction!addOrgan" method="post" theme="simple">
   <table align="center" border="1" >
     <tr><td align="center" colspan="2">部门信息</td></tr>
     <tr><td>部门名称</td><td><s:textfield key="organ.organName"></s:textfield></td></tr>
     <tr><td>部门机构编码</td><td><s:textfield key="organ.organCode"></s:textfield></td></tr> 
     <tr><td>上级机构编码</td><td><s:textfield key="organ.organFcode"></s:textfield></td></tr>
     <tr><td align="center" colspan="2">详细信息</td></tr>
     <tr><td>机构地址 </td><td><s:textfield key="organ.organDetail.odAddress"></s:textfield></td></tr>
     <tr><td>联系方式</td><td><s:textfield key="organ.organDetail.odRelation"></s:textfield></td></tr>
     <tr><td>隶属关系</td><td><s:textfield key="organ.organDetail.odAttach"></s:textfield></td></tr>
     <tr><td>机构级别</td><td><s:textfield key="organ.organDetail.odLevel"></s:textfield></td></tr>
     <tr><td>主管单位名称</td><td><s:textfield key="organ.organDetail.odManageName"></s:textfield></td></tr>
     <tr><td>部门性质</td><td><s:textfield key="organ.organDetail.odKind"></s:textfield></td></tr>
     <tr><td align="center" colspan="2"><s:submit value="添加"></s:submit></td></tr>
   </table>
   </s:form>
  </body>java代码：调用的是添加方法
public class OrganAction extends ActionSupport {
private Organ organ =new Organ();
private OrganDetail odl =new OrganDetail();
private PageInfo pageInfo=new PageInfo();//分页信息
private ArrayList<Organ> organs;
public OrganDetail getOdl() {
return odl;
}
public void setOdl(OrganDetail odl) {
this.odl = odl;
}


    public Organ getOrgan() {
return organ;
}
public void setOrgan(Organ organ) {
this.organ = organ;
}
public PageInfo getPageInfo() {
return pageInfo;
}
public void setPageInfo(PageInfo pageInfo) {
this.pageInfo = pageInfo;
}
public ArrayList<Organ> getOrgans() {
return organs;
}
public void setOrgans(ArrayList<Organ> organs) {
this.organs = organs;
}
/**
     * 添加部门
     * @return
     */
       public String addOrgan()throws Exception{
        OrganDAO organdao = new OrganDAO();
        OrganDetailDAO odldao = new OrganDetailDAO();
        organdao.insert(organ);
//        odl.setOdId(organ.getOrganId());
//        odldao.insert(odl);
        return queryOrganAll();
       }
       /**
        * 查询所有部门
        * @return
        */
       public String queryOrganAll()throws Exception{
        OrganDAO organdao = new OrganDAO();
        organs = (ArrayList<Organ>) organdao.findByPage(pageInfo);
//        for(Organ organ:organs){
//        System.out.println(organ.getOrganDetail()+"+++++++++++++++++++++++++++++++++");
//        System.out.println(organ.getOrganName()+"++++++++++++++++++++++++++++++++++++++++++++++");
//        }
       return "queryOrganAll";
        
       }
}报的异常：org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property: organ