JList null pointer exception

[Scott A Burch]

I am trying to get a button to open a file directory, retrieve some file names and add them as elements to a JLIst. The code opens the filechooser flawlessly, but the minute I click OK in the save dialog, I get a null pointer exception.

 private void addClipButtonActionPerformed(java.awt.event.ActionEvent evt) {                                              
        // TODO add your handling code here:

        int returnVal = fileChooser.showOpenDialog(this.getFrame());
        if (returnVal == JFileChooser.APPROVE_OPTION) {
        File file = fileChooser.getSelectedFile();

        DefaultListModel listModel = (DefaultListModel)jList1.getModel();
        listModel.addElement(file.getName());

        }

The problem comes with the button listener. I get null pointer exception at:

   int size = listModel.getSize();

class AddButtonListener implements ActionListener {
        public void actionPerformed(ActionEvent e) {

            int index = jList1.getSelectedIndex();
            int size = listModel.getSize();

            //If no selection or if item in last position is selected,
            //add the new one to end of list, and select new one.
            if (index == -1 || (index+1 == size)) {
                //listModel.addElement(nameField.getText());
                jList1.setSelectedIndex(size);

            //Otherwise insert the new one after the current selection,
            //and select new one.
            } else {
                //listModel.insertElementAt(nameField.getText(), index+1);
                jList1.setSelectedIndex(index+1);
            }
        }
    }

Please help me sort this out. Thanks!

[Scott A Burch]

Figured it out. I had created a local variable listModel and was hiding the list field.

I changed the line

DefaultListModel listModel = (DefaultListModel)jList1.getModel();  

to

listModel = (DefaultListModel)jList1.getModel();  

and it works. And the delete button works now too. Thanks!