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problems index after adding element to a Jlist

Kristof Camelbeke
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I can finally add a new element to a Jlist.
Everything works out fine when I add a new element without selecting something first.
When I have selected something from the Jlist and try to add a new item I get the following errors on the outputscreen :
Connection established successfully!
rowssize = 7
newIndex Jlist = 6
rowssize = 8
Exception occurred during event dispatching:
java.lang.ArrayIndexOutOfBoundsException: -1 < 0
at java.util.Vector.elementAt(
at veld.VeldGUI.veldenListSelected1(
at veld.VeldGUI.access$300
Here is the code for the actionHandler when I add an new element,FYI I work with vectors and not the DefaultListModel.

// Here I put the index of the Jlist to the added element
int newIndex = (rows.size()-1);
System.out.println ("newIndex Jlist = " +
Here is my ListSelectionListener when an item is selected :
private void veldenListSelected1(javax.swing.event.ListSelectionEvent evt) {
tfLengte.setText(new Integer(((Veld)rows.elementAt(veldenList.getSelectedIndex())).getLengte()).toString());

I agree. Here's the link:
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