请教高手：ssh中一对多数据关联时，为什么一方无法正常插入数据，多方则可以正常插入？
业务类别（ywlb）与一级指标(yjzb)是一对多数据关系，Ywlb.hbm.xml文件如下：
<hibernate-mapping>
  <class name="pbc.xjtac.zfjc.vo.Ywlb" table="ywlb" catalog="zfjc">
  <id name="id" type="java.lang.Integer">
  <column name="id" />
  <generator class="native" />
  </id>
  <property name="ywlb" type="java.lang.String">
  <column name="ywlb" length="45" />
  </property>
  <property name="qz" type="java.lang.Float">
  <column name="qz" precision="12" scale="0" />
  </property>
  <set name="yjzbs" cascade="all" inverse="true">
  <key>
  <column name="ywlb_id"></column>
  </key>
  <one-to-many class="pbc.xjtac.zfjc.vo.Yjzb"></one-to-many>
  </set>
  </class>
</hibernate-mapping>
Yjzb.hbm.xml的映射文件如下：
<hibernate-mapping>
  <class name="pbc.xjtac.zfjc.vo.Yjzb" table="yjzb" catalog="zfjc">
  <id name="id" type="java.lang.Integer">
  <column name="id" />
  <generator class="native" />
  </id>  
  <property name="yjzb" type="java.lang.String">
  <column name="yjzb" length="45" />
  </property>
   
  <set name="rjzbs" cascade="all"> //此处是建立与二级指标一对多关联关系
  <key>
  <column name="yjzb_id"></column>
  </key>
  <one-to-many class="pbc.xjtac.zfjc.vo.Rjzb"/>
  </set>
  </class>
</hibernate-mapping>
JgxxAction如下：
public class JgxxAction {
 private String ywlb;
  private Float qz;  
  private String yjzb;
 Setter、Getter方法省略
//增加业务项目
public String addYwlb(){
Ywlb ywlbs =new Ywlb();
ywlbs.setYwlb(ywlb);
ywlbs.setQz(qz);

if(jgxxService.findYwlb(ywlb)==null){
jgxxService.addYwlbS(ywlbs);
return "addywlbS";
}else{
return "addywlbF";
}}

//增加一级指标
public String addYjzb(){
Yjzb yjzbs = new Yjzb();
yjzbs.setYjzb(yjzb);  
if(jgxxService.findYjzbS(yjzb)==null){
jgxxService.addYjzbS(yjzbs);
return "addyjzbS";
}else{
return "addyjzbF";
}
}}
JgxxDaoHiberImpl文件如下
public class JgxxDaoHibImpl extends HibernateDaoSupport implements JgxxDao {
//查找业务项目名称
public Ywlb findYwlbD(String ywlb){
List<Ywlb> list =this.getHibernateTemplate().find("from Ywlb where ywlb =?",ywlb);
if(list.size()>0){
return list.get(0);
}
return null;
}
//增加业务类别
public void addYwlbD(Ywlb ywlb){
this.getHibernateTemplate().persist(ywlb);
}
//查找一级指标名称
public Yjzb findYjzbD(String yjzb){
List<Yjzb> list = this.getHibernateTemplate().find("from Yjzb where yjzb = ?",yjzb);
if(list.size()>0){
return list.get(0);
}else{
return null;
}}

//增加一级指标
public void addYjzbD(Yjzb yjzb){
this.getHibernateTemplate().persist(yjzb);