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Hibernate version:2.1.8

Mapping documents:
<hibernate-mapping>
<class name="test.ChildPO" table="CHILD" >
<id name="id" column="ID" type="long">
<generator class="sequence">
<param name="sequence">TEST_SEQ</param>
</generator>
</id>
<many-to-one name="parent" class="test.ParentPO" column="PARENTID" />
</class>
<class name="test.ParentPO" table="PARENT">
<id name="id" column="ID" type="long">
<generator class="sequence">
<param name="sequence">F_LOG_SEQ</param>
</generator>
</id>
<bag name="children" cascade="all" >
<key column="PARENTID"/>
<one-to-many class="test.ChildPO"/>
</bag>
</class>
</hibernate-mapping>


java code:
ParentPO parent = new ParentPO();
ChildPO child = new ChildPO(parent);
ChildPO child2 = new ChildPO(parent);
List list = new ArrayList();
list.add(child);
list.add(child2);
parent.setChildren(list);
session.save(parent);
session.flush();
System.out.println("dddddddddddddddddddddddddddddddddddddddddddddddddddddd") ;
ChildPO child3 = new ChildPO();
child3.setParent(parent);
session.save(child3);
session.flush();


error:
net.sf.hibernate.NonUniqueObjectException: a different object with the same identifier value was already associated with the session: 0, of class: test.ChildPO

at net.sf.hibernate.impl.SessionImpl.checkUniqueness(SessionImpl.java:1687)

at net.sf.hibernate.impl.SessionImpl.doUpdateMutable(SessionImpl.java:1453)

at net.sf.hibernate.impl.SessionImpl.doUpdate(SessionImpl.java:1480)

at net.sf.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:1403)

at net.sf.hibernate.engine.Cascades$4.cascade(Cascades.java:114)

at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:436)

at net.sf.hibernate.engine.Cascades.cascadeCollection(Cascades.java:526)

at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:452)

at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:503)

at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:962)

at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:868)

at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:790)

at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:749)

at b2bmanage.pub.db.TestSession.main(TestSession.java:27)


oracle 9.0

class:
public class ParentPO {
private java.util.List children;
private long id;
public ParentPO() {
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public java.util.List getChildren() {
return children;
}
public void setChildren(java.util.List children) {
this.children = children;
}

}
public class ChildPO {
private ParentPO parent;
private long id;
public ChildPO() {
}
public ChildPO(ParentPO parent) {
this.parent = parent;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public ParentPO getParent() {
return parent;
}
public void setParent(ParentPO parent) {
this.parent = parent;
}

}


Debug level Hibernate log excerpt:

i don't know why, can anyone help me out ,thanks in advance.