Hibernate Problem...

Question

Hi people...
I have implemented an application which it parses an rss online and then it saves it into oracle DB through Hibernate. I am facind a problem which i cannot explain. In the first time the user is entering the rss url to a jsp then the rss is parsed the wanted values are saved into the DB and then displayed back through a jsp again. With not ending the application and going back to re-enter a new url the application throughs an exception before commiting the transaction at the Hibernate part.
The code to the hibernate has as follows...
      try
        System.out.println("in the beggining");
        session = sf.openSession();
        trans = session.beginTransaction();
          System.out.println("in the middle");
        Rss rcv = new Rss();
        Item riv = new Item();
         riv.setRss(rcv);
        System.out.println("be4 saving");
            session.save(rcv);
          System.out.println("saved rcv");
            session.save(riv);
          System.out.println("saved riv");
          System.out.println("The trans is :    "+trans.wasCommitted());
          session.update(riv);
            trans.commit();
          System.out.println("after commit");
          System.out.println("THE SESSION: "+session.isOpen());
        session.close();
        System.out.println("THE SESSION: "+session.isOpen());
      catch(Exception exc)
        try{if(trans != null) trans.rollback();}catch(HibernateException h){System.out.println("MMMPPPOOOXXXAAA   "+ h);}
        exc.printStackTrace();
      }I debug and i came to the above conclution, failing at commit. I cant explain why because it works in the beggining. I also find out that if i dont redirect for displaying the results i can re-enter values into the DB without the exception occuring. The exception is the following...
net.sf.hibernate.HibernateException: identifier of an instance of com.persistence.Item altered from 2190 to 2191
     at net.sf.hibernate.impl.SessionImpl.checkId(SessionImpl.java:2631)
     at net.sf.hibernate.impl.SessionImpl.flushEntity(SessionImpl.java:2454)
     at net.sf.hibernate.impl.SessionImpl.flushEntities(SessionImpl.java:2447)
     at net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2249)
     at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2228)
     at net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:61)
     at com.HibernateFactory.saveValues(HibernateFactory.java:104)
     at com.persistence.Item.setMakeCon(Item.java:85)
     at com.RssParser.endElement(RssParser.java:147)
     at oracle.xml.parser.v2.NonValidatingParser.parseElement(NonValidatingParser.java:1310)
     at oracle.xml.parser.v2.ValidatingParser.parseRootElement(ValidatingParser.java:144)
     at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:295)
     at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:201)
     at oracle.xml.jaxp.JXSAXParser.parse(JXSAXParser.java:292)
     at javax.xml.parsers.SAXParser.parse(SAXParser.java:255)
     at com.RssParser.connect(RssParser.java:227)
     at com.ConfigServlet.doPost(ConfigServlet.java:51)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:719)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:376)
     at com.evermind.server.http.HttpRequestHandler.doProcessRequest(HttpRequestHandler.java:870)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:451)
     at com.evermind.server.http.HttpRequestHandler.serveOneRequest(HttpRequestHandler.java:218)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:119)
     at com.evermind.server.http.HttpRequestHandler.run(HttpRequestHandler.java:112)
     at oracle.oc4j.network.ServerSocketReadHandler$SafeRunnable.run(ServerSocketReadHandler.java:260)
     at com.evermind.util.ReleasableResourcePooledExecutor$MyWorker.run(ReleasableResourcePooledExecutor.java:303)
     at java.lang.Thread.run(Thread.java:595)and the code for the JSP page which displays the results is:
<%@ page contentType="text/html; charset=utf-8" language="java"
       import="com.persistence.*,net.sf.hibernate.*, com.*, java.util.*" %>
      <%
Session ses = null;
Transaction myTransaction = null;
SessionFactory sf = HibernateFactory.getSessionFactory();
System.out.println("THE SESSION: "+sf.toString());
ses = sf.openSession();
try
      //getSessionFactory();
      System.out.println("THE SESSION: "+ses.isOpen());
      myTransaction = ses.beginTransaction();
      Criteria query =
           ses.createCriteria(Rss.class);
      myTransaction.commit();
} catch (Exception e) {
      //error = e.getMessage(); e.printStackTrace();
      System.out.println("THIS FAIL:    "+ e);
      try{ myTransaction.rollback(); }
      catch (Exception e2) {;}
%>
<HTML>
<HEAD>
<TITLE>List Teams</TITLE>
</HEAD>
<BODY>
<%
//Query q =HibernateFactory.session.createQuery("Select Rss from Rss as Rss");
Query q =ses.createQuery("Select Rss from Rss as Rss");
try{
//ses.close();
        for (Iterator it = q.iterate(); it.hasNext();) {
                    Rss rsv = (Rss) it.next(); %>
    <table border="1">
        <tr>
            <td> <strong> Channel Title </strong></td>
            <td> <strong> Channel URL </strong></td>
            <td> <strong> Main Link </strong></td>
            <td> <strong> Last Date Built </strong></td>
            <td> <strong> Item Title </strong></td>
            <td> <strong> Item Link </strong></td>
            <td> <strong> Item Description </strong></td>
        </tr> 
        <tr>   
            <td> <%=rsv.getChannelTitle()%> </td>
            <td> <%= rsv.getChannelUrl()%> </td>
            <td> <%= rsv.getMainLink()%> </td>
            <td> <%= rsv.getLastDate()%> </td> 
             <%       Iterator t = rsv.getItem().iterator();
                    while (t.hasNext()) {
                        Item riv =(Item)t.next();
                    %>
            <td> <%= riv.getTitle() %> </td>
            <td> <%= riv.getItemLink()%> </td>
            <td> <%= riv.getItemDescription() %></td>
         </tr>
          </table>     
          <%}
    } catch(Exception e){
           System.out.println("AOUTS: "+ e);
finally
      try{ses.close();}
      catch (Exception e) {
      System.out.println("AOUTS: "+ e);}
%>
<p align="right"><a href="RssList.jsp">Add Another RSS.XML File </a> </p> 
</BODY>
</HTML>Do you have any ideas why this happens? I am desperate for some help.
Thx in advance

Answer 1

Ok here you go
The Item class
package com.persistence;
import com.*;
import java.util.Set;
public class Item {
    public static String t;
    public static String link;
    public static String desc;
    public static Rss rss;
    public static long id;
    public static String num;
    public static String verify;
    public Item() {
    public String getTitle() {
        return t;
    public void setTitle(String title) {
        t = title;
        if (title != null){
       // HibernateFactory.saveValues();
    public String getItemLink() {
        //  while ( link. = null )
        // System.out.println("Getting: " + this + " value: " + link);
        return link;
    public void setItemLink(String link) {
        this.link = link;
      //  HibernateFactory.saveValues();
        // System.out.println("///////////////////////////");
        // System.out.println("this is the Rss Item Link value: "+ link);
        //  System.out.println("Setting: " + this + " value: " + link);
    public String getItemDescription() {
        return desc;
    public void setItemDescription(String desc) {
        this.desc = desc;
       // HibernateFactory.saveValues();
       // System.out.println("///////////////////////////");
        //System.out.println("this is the Rss Item Description value: "+ desc);
         public Rss getRss()
           return rss;
         public void setRss(Rss rss)
           this.rss = rss;
    public long getId() {
        return id;
    public void setId(long id) {
        this.id = id;
    public void setMakeCon(String verify){
        this.verify = verify;
        if (verify != null) {
            HibernateFactory.saveValues();
        }else if(verify == null){
            System.out.println("The VERIFY FROM item was NULL");
package com.persistence;
import com.*;
import java.util.Set;
public class Item {
    public static String t;
    public static String link;
    public static String desc;
    public static Rss rss;
    public static long id;
    public static String num;
    public static String verify;
    public Item() {
    public String getTitle() {
        return t;
    public void setTitle(String title) {
        t = title;
        if (title != null){
       // HibernateFactory.saveValues();
    public String getItemLink() {
        //  while ( link. = null )
        // System.out.println("Getting: " + this + " value: " + link);
        return link;
    public void setItemLink(String link) {
        this.link = link;
      //  HibernateFactory.saveValues();
        // System.out.println("///////////////////////////");
        // System.out.println("this is the Rss Item Link value: "+ link);
        //  System.out.println("Setting: " + this + " value: " + link);
    public String getItemDescription() {
        return desc;
    public void setItemDescription(String desc) {
        this.desc = desc;
       // HibernateFactory.saveValues();
       // System.out.println("///////////////////////////");
        //System.out.println("this is the Rss Item Description value: "+ desc);
         public Rss getRss()
           return rss;
         public void setRss(Rss rss)
           this.rss = rss;
    public long getId() {
        return id;
    public void setId(long id) {
        this.id = id;
    public void setMakeCon(String verify){
        this.verify = verify;
        if (verify != null) {
            HibernateFactory.saveValues();
        }else if(verify == null){
            System.out.println("The VERIFY FROM item was NULL");
The Parser class
package com;
import com.persistence.*;
import org.xml.sax.*;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.parsers.SAXParser;
public class RssParser extends DefaultHandler
  boolean inTitle = false;
  boolean inChannel = false;
  boolean inChannelTitle = false;
  boolean inImage = false;
  boolean inItem = false;
  boolean inItemDescription = false;
  boolean inItemLink = false;
  boolean inChannelUrl = false;
static StringBuffer st = new StringBuffer();
Item rss = new Item();
Rss mainRss = new Rss();
HibernateFactory hf = new HibernateFactory();
  private String channeltitle = "";
  private String channelUrl = "";
    private String itemLink = "";
    public String verify = "";
  String title = "";
  public RssParser()
  public void startDocument() throws SAXException
    System.out.println("START DOCUMENT");
  public void endDocument() throws SAXException
    System.out.println("END DOCUMENT");
public void startElement(String namespaceURI, String sName, String qName, Attributes attrs) throws SAXException
    String eName = sName; // element name
    if ("".equals(eName)) eName = qName; // not namespaceAware
    if (attrs != null)
      for (int i = 0; i < attrs.getLength(); i++)
        String aName = attrs.getLocalName(i);
        if ("".equals(aName)) aName = attrs.getQName(i);
        //System.out.print(aName +"=\""+attrs.getValue(i)+"\"");
      if (eName.equals("channel"))
      inChannel = true;
     if(eName.equals("title") && inChannel &&!inImage && !inItem )
       inChannelTitle = true; 
      if(eName.equals("url") && inChannel && inImage && !inItem )
        inChannelUrl = true;       
     if(eName.equals("image"))
       inImage=true;
      if(eName.equals("item"))
       inItem = true;
        rss.setMakeCon("");
     if(eName.equals("title") && inItem)
          inTitle = true; 
     if(eName.equals("description")&& inItem)
       inItemDescription=true;
     if(eName.equals("link")&&!inImage)
       inItemLink=true;
  public void endElement(String namespaceURI, String sName, String qName) throws SAXException
    String eName = sName; // element name
    if ("".equals(eName)) eName = qName; // not namespaceAware
       if (eName.equals("channel"))
      inChannel = false;
     if(eName.equals("title") && inChannel && !inImage && !inItem )
          inChannelTitle = false; 
            mainRss.setChannelTitle(channeltitle);
            if(channeltitle != null){
            rss.setMakeCon("OK");}
            //hf.channelTitle();
          System.out.println("///////////////////////////");
      if (eName.equals("url")&& inChannel && inImage && !inItem)
      inChannelUrl = false;
          mainRss.setChannelUrl(channelUrl);
         // System.out.println("the CHANNEL URLIS:   "+sc);
          //hf.channelUrl();
          System.out.println("///////////////////////////");
         if(eName.equals("image"))
       inImage=false;
     if(eName.equals("item"))
       inItem = false;
       channeltitle = "";
//         rss.setMakeCon("");
     if(eName.equals("title") && inItem)
          inTitle = false; 
     if(eName.equals("description"))
       inItemDescription=false;
       System.out.println("\n");
    if(eName.equals("link")&&!inImage)
       inItemLink=false;
  public void connect() throws Exception
    String file;
    file = ConfigServlet.getAddress();
    //con.setRequestMethod("POST");
    // Use the default (non-validating) parser
    SAXParserFactory factory = SAXParserFactory.newInstance();
    //Set validation on
    factory.setValidating(true);
    // Parse the input
    SAXParser saxParser = factory.newSAXParser();
    saxParser.parse(file, this); 
  public void characters (char ch[], int start, int length)
    String sc = new String( ch, start, length ); 
    if(inChannelTitle)
      //System.out.print(sc);
      channeltitle = channeltitle + sc;
    if(inTitle)
      //System.out.println(sc);
      rss.setTitle(sc);
      //hf.title();
      //System.out.println("///////////////////////////");
    if(inItemDescription)
     // System.out.println("///////////////////////////");
     rss.setItemDescription(sc);
     //hf.itemDescription();
      if(inChannelUrl){ 
          channelUrl = channelUrl + sc;
    if(inItemLink)
        rss.setItemLink(sc);
        itemLink = sc;
        System.out.println("the item link   "+itemLink);
     //   hf.itemLink();
     // System.out.println(sc);
}There are many things for testing in there. Code is not in its best condition. Thing might be wrong implemented, trying my best here...:)