<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!--
    Mapping file autogenerated by MyEclipse - Hibernate Tools
-->
<hibernate-mapping>
    <class name="core.database.hibernate.Node2" table="node2" catalog="ave">
        <id name="id" type="java.lang.Integer">
            <column name="id" />
            <generator class="native" />
        </id>
        <many-to-one name="node2ByChildId" class="core.database.hibernate.Node2" fetch="select">
            <column name="child_id" />
        </many-to-one>
        <many-to-one name="node2ByParentId" class="core.database.hibernate.Node2" fetch="select">
            <column name="parent_id" />
        </many-to-one>
        <property name="name" type="java.lang.String">
            <column name="name" length="30" not-null="true" />
        </property>
        <set name="node2sForChildId" inverse="true" >
            <key>
                <column name="child_id" />
            </key>
            <one-to-many class="core.database.hibernate.Node2" />
        </set>
        <set name="node2sForParentId" inverse="true">
            <key>
                <column name="parent_id" />
            </key>
            <one-to-many class="core.database.hibernate.Node2" />
        </set>
    </class>
</hibernate-mapping>

package core.database.hibernate;

import java.util.HashSet;
import java.util.Set;


/**
* AbstractNode2 generated by MyEclipse - Hibernate Tools
*/

public abstract class AbstractNode2  implements java.io.Serializable {


    // Fields   

     private Integer id;
     private Node2 node2ByChildId;
     private Node2 node2ByParentId;
     private String name;
     private Set node2sForChildId = new HashSet(0);
     private Set node2sForParentId = new HashSet(0);


    // Constructors

    /** default constructor */
    public AbstractNode2() {
    }
   
    public AbstractNode2(String name){
       this.name = name;
    }
   
   /** minimal constructor */
    public AbstractNode2(Integer id, String name) {
        this.id = id;
        this.name = name;
    }
   
    /** full constructor */
    public AbstractNode2(Integer id, Node2 node2ByChildId, Node2 node2ByParentId, String name, Set node2sForChildId, Set node2sForParentId) {
        this.id = id;
        this.node2ByChildId = node2ByChildId;
        this.node2ByParentId = node2ByParentId;
        this.name = name;
        this.node2sForChildId = node2sForChildId;
        this.node2sForParentId = node2sForParentId;
    }

   
    // Property accessors

    public Integer getId() {
        return this.id;
    }
   
    public void setId(Integer id) {
        this.id = id;
    }

    public Node2 getNode2ByChildId() {
        return this.node2ByChildId;
    }
   
    public void setNode2ByChildId(Node2 node2ByChildId) {
        this.node2ByChildId = node2ByChildId;
    }

    public Node2 getNode2ByParentId() {
        return this.node2ByParentId;
    }
   
    public void setNode2ByParentId(Node2 node2ByParentId) {
        this.node2ByParentId = node2ByParentId;
    }

    public String getName() {
        return this.name;
    }
   
    public void setName(String name) {
        this.name = name;
    }

    public Set getNode2sForChildId() {
        return this.node2sForChildId;
    }
   
    public void setNode2sForChildId(Set node2sForChildId) {
        this.node2sForChildId = node2sForChildId;
    }

    public Set getNode2sForParentId() {
        return this.node2sForParentId;
    }
   
    public void setNode2sForParentId(Set node2sForParentId) {
        this.node2sForParentId = node2sForParentId;
    }
   
}


package core.database.hibernate;
// Generated by MyEclipse - Hibernate Tools

import java.util.Set;


/**
* Node2 generated by MyEclipse - Hibernate Tools
*/
public class Node2 extends AbstractNode2 implements java.io.Serializable {

    // Constructors

    /** default constructor */
    public Node2() {
    }
   
    public Node2(String name){
       super(name);
    }
   
   /** minimal constructor */
    public Node2(Integer id, String name) {
        super(id, name);       
    }
   
    /** full constructor */
    public Node2(Integer id, Node2 node2ByChildId, Node2 node2ByParentId, String name, Set node2sForChildId, Set node2sForParentId) {
        super(id, node2ByChildId, node2ByParentId, name, node2sForChildId, node2sForParentId);       
    }
   
    public void add(Node2 child){
       child.setNode2ByParentId(this);
       this.setNode2ByChildId(child);
    }
   
}

import java.util.Iterator;
import java.util.List;

import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;

import core.database.hibernate.HibernateSessionFactory;
import core.database.hibernate.Node2;

public class test {

   /**
    * @param args
    */
   public static void main(String[] args) {
      // TODO Auto-generated method stub
      Transaction tx = null;
      Node2 no = new Node2();
      no.setName("a");
      Node2 noB = new Node2("b");
      noB.add(new Node2("c"));
      no.add(noB);
      
      Session session = HibernateSessionFactory.getSession();
      
      try {
         tx = session.beginTransaction();
         session.save(no);
         tx.commit();
         
      } catch (HibernateException e) {
         // TODO: handle exception
         e.printStackTrace();
      }
      
      List  nodes = session.createQuery("select h from Node2 as h").list();
      for(Iterator iter = nodes.iterator(); iter.hasNext();){
         Node2 n = (Node2)iter.next();
         System.out.println("Name: " +n.getName());
      }
   }

}

org.hibernate.TransientObjectException: core.database.hibernate.Node2
   at org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:216)
   at org.hibernate.type.EntityType.getIdentifier(EntityType.java:108)
   at org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:221)
   at org.hibernate.type.TypeFactory.findDirty(TypeFactory.java:476)
   at org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:2803)
   at org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:467)
   at org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:190)
   at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:113)
   at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:195)
   at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
   at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
   at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985)
   at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:333)
   at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
   at test.main(test.java:32)