ResultSet returns information twice...eek

Question

HI,
I am creating a database interrogation application and thought it would be good to use a JList to return the results so that I could then move on to a deeper level from there.
The issue I have is that I am getting the results returned twice. I cannot see where this loop is. Any thoughts?
public void itemStateChanged(ItemEvent b){
     if(box1.getSelectedIndex()==1){
          //search all
          try{
     ResultSet rs = db_statement.executeQuery("select * from staff");
     while (rs.next()) {
              listModel.addElement(""+rs.getString("Forename")+"\t  "+rs.getString("Surname")+"\n");
          }//end while
     }  // end try
     catch (Exception e){}
     p2.removeAll();                         
     p2.add(list);
     p2.add(selectedName);
     p2.add(detailButton);
}Thanks

Answer 1

I managed to debug. Does not look good. Appears to be called 8 times. The below information is repeated 8 times.
java.lang.Exception
at Unitest.itemStateChanged(Unitest.java:82)
at javax.swing.JComboBox.fireItemStateChanged(JComboBox.java:1161)
at javax.swing.JComboBox.selectedItemChanged(JComboBox.java:1218)
at javax.swing.JComboBox.contentsChanged(JComboBox.java:1265)
at javax.swing.AbstractListModel.fireContentsChanged(AbstractListModel.java:100)
at javax.swing.DefaultComboBoxModel.setSelectedItem(DefaultComboBoxModel.java:88)
at javax.swing.JComboBox.setSelectedItem(JComboBox.java:551)
at javax.swing.JComboBox.setSelectedIndex(JComboBox.java:597)
at javax.swing.plaf.basic.BasicComboPopup$ListMouseHandler.mouseReleased(BasicComboPopup.java:749)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:228)
at java.awt.Component.processMouseEvent(Component.java:5021)
at javax.swing.plaf.basic.BasicComboPopup$2.processMouseEvent(BasicComboPopup.java:452)
at java.awt.Component.processEvent(Component.java:4818)
at java.awt.Container.processEvent(Container.java:1525)
at java.awt.Component.dispatchEventImpl(Component.java:3526)
at java.awt.Container.dispatchEventImpl(Container.java:1582)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3359)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3074)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3004)
at java.awt.Container.dispatchEventImpl(Container.java:1568)
at java.awt.Window.dispatchEventImpl(Window.java:1581)
at java.awt.Component.dispatchEvent(Component.java:3367)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:191)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)
This is on the following code (put it in one file to try to help me find the problem) import java.sql.*;
import java.io.DataInputStream;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.event.*;
import java.awt.*;
class Unitest extends JFrame implements ListSelectionListener,ItemListener{
     String[] type={"Select One","All","Forename","Surname"};
     JComboBox box1=new JComboBox(type);
     JPanel p1=new JPanel();
     JPanel p2=new JPanel();
     Connection db_connection;
     Statement db_statement;          
     DefaultListModel listModel = new DefaultListModel();
     JList list = new JList(listModel);
     Container content=this.getContentPane();
     public Unitest() {
          //super("Unitest");
          addWindowListener(new WindowAdapter() {
               public void windowClosing(WindowEvent e) {
                    dispose();
                    System.exit(0);
          try{               
               Class.forName("sun.jdbc.odbc.JdbcOdbcDriver").newInstance();
               String url = "jdbc:odbc:"+"Uni1";
               db_connection = DriverManager.getConnection(url,"","");
               db_statement = db_connection.createStatement();
          catch(Exception ce){ce.printStackTrace();}
               content.setLayout(new FlowLayout());               
               box1.setMaximumRowCount(5);
               box1.addItemListener(this);
               p1.add(box1);
             //Create the list and put it in a scroll pane             
             list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
             list.addListSelectionListener(this);
             JScrollPane listScrollPane = new JScrollPane(list);
             list.setBorder(BorderFactory.createCompoundBorder(BorderFactory.createLoweredBevelBorder(),BorderFactory.createRaisedBevelBorder()));
             p1.add(list);
             content.add(p1);
          content.add(p2);
               public void itemStateChanged(ItemEvent b){                    
                    if(box1.getSelectedIndex()==1){
                         //search all
                         try{                    
               ResultSet rs = db_statement.executeQuery("select * from staff");
               while (rs.next()) {
               new Exception().printStackTrace(System.err);
                        listModel.addElement(""+rs.getString("Forename")+"\t  "+rs.getString("Surname")+"\n");
          }//end while
     }  // end try
                         catch (Exception e){}
                         p2.add(list);
               }// end if
          }// end itemStateChanged
          public void valueChanged(ListSelectionEvent ls) {}
     public static void main(String args[]) {
          System.out.println("Starting Unitest...");
          Unitest mainFrame = new Unitest();
          mainFrame.setSize(400, 400);
          mainFrame.setTitle("Unitest");
          mainFrame.setVisible(true);
}Fess