Using two editor instances within JTable

Question

Hello,
I'm struggling around using component editors within JTable. E.g. selectAll text on entering a JTextField cell or immediately raising the popup while entering a JComboBox cell.
In my analysis most of these problems arises due the re-use of the cell editor.
The event sequence is doing things in the context of the old cell while preparing the editor for the new cell has already been started.
Because it is the same component and some things are bound deep inside the L&F it seems not easy to handle them properly.
Just an idea from me is to avoid such problems by working with two instances for the editors in general. This should avoid all problems coming out of overlapping event processing. (To provide each cell with an own component is of course no solution)
Any comment on such an approach?
Thanks in advance
Wolfgang R.

Answer 1

No, it wasn't the custom JTable extension.
By entering a cell a popup will be shown for a short moment. This is only by using Windows L&F (not Metal). Within the L&F a togglePopup() is called which may cause this problem.
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.util.EventObject;
import javax.swing.DefaultCellEditor;
import javax.swing.JComboBox;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;
public class JTableExt extends JTable {
     public static class ComboBoxEnumRenderer extends JComboBox implements
               TableCellRenderer {
          public ComboBoxEnumRenderer() {
               setEditable(false);
               setBackground(Color.WHITE);
          public Component getTableCellRendererComponent(JTable table, Object value,
                    boolean isSelected, boolean hasFocus, int row, int column) {
               this.removeAllItems();
               this.addItem(value);
               return this;
     public static class ComboBoxEnumEditor extends DefaultCellEditor {
          private static String[] values = null;
          public ComboBoxEnumEditor() {
               super(new JComboBox());
               values = new String[50000];
               for (int i = 0; i < values.length; i++) {
                    values[i] = "row_" + i;
          public Component getTableCellEditorComponent(JTable table, Object value,
                    boolean isSelected, int row, int column) {
               JComboBox combo = (JComboBox) getComponent();
               combo.removeAllItems();
               for (int i = 0; i < values.length; i++) {
                    combo.addItem(values);
               combo.setSelectedIndex(0);
               return super.getTableCellEditorComponent(table, value, isSelected, row,
                         column);
     public JTableExt() {
          super();
          init();
     // invoke editor on cell entry
     public void changeSelection(final int row, final int column, boolean toggle,
               boolean extend) {
          super.changeSelection(row, column, toggle, extend);
          if (editCellAt(row, column))
               getEditorComponent().requestFocusInWindow();
     private void init() {
          setDefaultEditor(Object.class, new ComboBoxEnumEditor());
          setDefaultRenderer(Object.class, new ComboBoxEnumRenderer());
     private static void setUI() {
          String lnfName = "";
          //lnfName = "com.jgoodies.plaf.plastic.Plastic3DLookAndFeel";
          lnfName = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
          try {
               UIManager.setLookAndFeel(lnfName);
          } catch (Exception exc) {
     public static void main(String args[]) {
          try {
               setUI();
               javax.swing.JFrame frame = new javax.swing.JFrame();
               frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
               frame.getContentPane().setLayout(new BorderLayout());
               final JTableExt demo = new JTableExt();
               Object[][] data = new Object[30][1];
               demo.setModel(new DefaultTableModel(data, new String[] { "first column" }));
               frame.getContentPane().add("Center", new JScrollPane(demo));
               frame.setSize(600, 600);
               frame.setVisible(true);
          } catch (Throwable t) {
               System.exit(0);
//end