JComboBox - different behaviour in 1.3 and 1.4

I have noticed that there is a difference in JCombobox behaviour in 1.3 and 1.4.
I think it is better to give the program than explaining the issue.
the below given program shows the difference.
import javax.swing.* ;
import java.awt.* ;
import java.awt.event.* ;
import java.util.* ;
* Test program to show difference between
* Combo behaviour in java1.3 and 1.4
public class CTest extends JFrame
     private JComboBox combo1 ;
     private JComboBox combo2 ;
     public CTest()
          super() ;
     public void init()
     combo1 = new JComboBox() ;
          combo1.addItemListener( new ItemListener()
                    public void itemStateChanged( ItemEvent event )
                    if (null != combo1.getSelectedItem() && event.getStateChange() == ItemEvent.SELECTED)
                         loadCombo2(combo1.getSelectedIndex()+1) ;
     combo2 = new JComboBox() ;
          combo2.addItemListener( new ItemListener()
                    public void itemStateChanged( ItemEvent event )
                    if (null != combo2.getSelectedItem() && event.getStateChange() == ItemEvent.SELECTED)
                         System.out.println("Combo2 item selected : "+ combo2.getSelectedItem()) ;
          JPanel panel = new JPanel(new BorderLayout()) ;
          panel.add(combo1,BorderLayout.NORTH) ;
          panel.add(combo2,BorderLayout.SOUTH) ;
          getContentPane().add(panel) ;
     public void loadCombo1()
          combo1.removeAllItems() ;
          for (int iCount = 0 ; iCount <5 ; iCount++)
               String strItem = "Item : "+iCount ;
          combo1.addItem(strItem) ;
          try
               combo1.setSelectedIndex(0) ;
          catch(Exception e)
     private void loadCombo2(int itemCount)
          combo2.removeAllItems() ;
          for (int iCount = 0 ; iCount <itemCount ; iCount++)
               String strItem = "Item : "+iCount ;
          combo2.addItem(strItem) ;
          try
               combo2.setSelectedIndex(0) ;
          catch(Exception e)
     public static final void main(String args[])
          CTest app = new CTest() ;
          app.init() ;
          app.setSize(100,100) ;
          app.setVisible(true) ;
          app.loadCombo1() ;
In jdk1.3 every time you change the selection in combo 1 there will be selection change in combo 2 also. but not in jdk1.4.
i am not sure whether it is a bug. But surely te behaviour is different.
any comments on this issue???

Anil,
I've just noticed this as well, so I had a quick look at the 1.4 sources. Quite simply, adding and removing items in a JComboBox will never fire an ItemStateChangedEvent, even if the selected item does change.
The culprits are intervalAdded() and intervalRemoved() in JComboBox.java. Under 1.3 these methods called contentsChanged() which would then fire an ItemStateChangedEvent if necessary. Under 1.4, these methods are empty. Why? I have no idea. It seems like a bug to me, but can't see anything in the bug database about it. Hope someone from Sun can explain it.
Regards,
Peter

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bestregards
eG

Not sure about most of your questions -- this is all new stuff for me, too. But on this one item, I hope this helps:
For example it tells me that a plugin (which has already been installed) needs to be installed.If you installed the Mozilla browser after initially installing the java plugin in IE, then the plugin needs to be installed within the Mozilla browser's plugins directory. And I have never been able to get Netscape or Firefox to install a Forms plugin properly. It seems like I need to run IE to get the plugin installed automatically. Then I go back to the other browser and all is ok. Looking into the Mozilla-based browser's plugins folders, I can see that running the plugin install through IE also copies the corresponding .dll file into all the Mozilla-based browsers' plugins folders.
But since you have already installed the plugin in IE, I am not sure how you would get it to work for the other browser. But if you can identify the .dll required, just copy it yourself into your Mozilla browser's folder.

JComboBox - different behaviour in 1.3 and 1.4

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