Re: any recommendations?

Nigel Wade <>
Mon, 05 Feb 2007 12:34:27 +0000
Brandon McCombs wrote:

The method I call for deleting a selected item from the JList is the
following (model is the instance of BrowserModel):

private void list_deleteObj() {
      int idx = dirList.getSelectedIndex();
      String dn = LDAPMgr.ldapUtility.getDN(
              model.getListModel().getElementAt(idx) );
      int ans = JOptionPane.showConfirmDialog(this,
              "Confirm delete for:\n" + dn + "\n",
              "Delete Object", JOptionPane.YES_NO_OPTION,
      if (ans == 1)
      String msg = null;
      msg = LDAPMgr.ldapUtility.deleteEntry(
      /* if successful */
      if (msg == null) {
              /* reload the subtree and list to show deletion */

What thread is the above method being executed on? If it's not the EDT you have
a problem there, you are modifying the JList in a thread other than the EDT.

The error is telling you that when the EDT came to draw a JList it tried to
access element 1 and that element didn't exist in the the DefaultListModel's
Vector at the time. That would imply a synchronization error, the Vector is in
the process of being modified whilst it's being drawn (the JList and
DefaultTreeModel have a different idea of how many elements there are), and I
don't see how that can happen unless it's being modified from another thread -
even the EDT can only do one thing at a time...

Nigel Wade, System Administrator, Space Plasma Physics Group,
            University of Leicester, Leicester, LE1 7RH, UK
E-mail :
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555

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