FULL PRODUCT VERSION :
java version "1.6.0_01"
Java(TM) SE Runtime Environment (build 1.6.0_01-b06)
Java HotSpot(TM) Client VM (build 1.6.0_01-b06, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
If I have a JTable, and I set all the columns to use the DefaultCellEditor with the clickCountToStart set to 1 (it defaults to 2), the table works fine if placed on a panel directly within a JFrame. But if it is placed within a JInternalFrame, the focus is all messed up.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Run the test case
2. Click on the JTextField under Label "Field1".
3. Click inside a cell in the JTable below the JTextField.
4. Note that even DefaultCellEditor.setClickCountToStart(1) is used.
5. Comment line 70 & uncomment line 71 in the test case
6. Repeat 2 & 3 to observe the difference.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.Dimension;
import java.util.Enumeration;
import javax.swing.BoxLayout;
import javax.swing.DefaultCellEditor;
import javax.swing.JDesktopPane;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
 
public class TableTest extends JFrame
{

public TableTest()
{
addWindowListener(new java.awt.event.WindowAdapter()
{
public void windowClosing(java.awt.event.WindowEvent evt)
{
System.exit(0);
}
});

JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

String[] columnNames = {"First Name", "Last Name","Sport","# of Years","Vegetarian"};
Object[][] data= new Object[3][5];
JTable table = new JTable(data, columnNames);
table.setSurrendersFocusOnKeystroke(true);
table.putClientProperty("terminateEditOnFocusLost", Boolean.TRUE);

DefaultCellEditor editor = new DefaultCellEditor(new JTextField());

// ************ change to 2 to make it work smoothly
editor.setClickCountToStart(1);
TableColumnModel tcm = table.getColumnModel();
Enumeration e = tcm.getColumns();
TableColumn col = null;
while( e.hasMoreElements() )
{
col = (TableColumn) e.nextElement();
col.setCellEditor(editor);
}

JScrollPane jScrollPane = new JScrollPane();
jScrollPane.setViewportView(table);

panel.add(new JLabel("Field 1"));
panel.add(new JTextField(15));
panel.add(jScrollPane);

// ************ comment out one or the other of these to see error
initInteralFrame(panel);
//initNoInteralFrame(panel);

Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
setSize(new Dimension(800, 600));
setLocation((screenSize.width-800)/2,(screenSize.height-600)/2);
}

private void initInteralFrame(JPanel panel)
{
JInternalFrame jif = new JInternalFrame();
JDesktopPane desktop = new JDesktopPane();
jif.setVisible(true);
desktop.add(jif);
setContentPane(desktop);
jif.add(panel);
jif.pack();
}

private void initNoInteralFrame(JPanel panel)
{
getContentPane().add(panel);
}

/**
* @param args the command line arguments
*/
public static void main(String args[])
{
new TableTest().setVisible(true);
}

}

---------- END SOURCE ----------