FULL PRODUCT VERSION :
java version "1.6.0-beta2"
Java(TM) SE Runtime Environment (build 1.6.0-beta2-b86)
Java HotSpot(TM) Client VM (build 1.6.0-beta2-b86, mixed mode, sharing)

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

A DESCRIPTION OF THE PROBLEM :
JTable rows selection is not hightlighted properly, if we have a column with zero width. The problem appears only if the first or last column of the table has zero width.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the test case below. After the frame opens just try to select around different rows in the table and eventually scroll the table content a little.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The selected rows should have a different and consistent background color.
ACTUAL -
The cells that are colored as selected are not related to the real selection.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package bugs;

import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;

public class TableWheel {

    public static void main(String[] args) {
        JFrame frame = new JFrame("Mustang Swing Bug");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(new JScrollPane(TableWheel.getJTable()));
        Dimension screen = Toolkit.getDefaultToolkit().getScreenSize();
        frame.setBounds((screen.width-300)/2,(screen.height-200)/2,300,200);
        frame.setVisible(true);
    }
    
    public static JTable getJTable() {
        Object[][] data = {
                {"1", "1", "1", "1", "1", "1", "1", "1", "1", "1"},
                {"1", "1", "1", "1", "1", "1", "1", "1", "1", "1"},
                {"1", "1", "1", "1", "1", "1", "1", "1", "1", "1"},
                {"1", "1", "1", "1", "1", "1", "1", "1", "1", "1"},
                {"1", "1", "1", "1", "1", "1", "1", "1", "1", "1"}
                };
        Object[] columns = {"Col1", "Col2", "Col3", "Col4", "Col5", "Col6", "Col7", "Col8", "Col9", "Col10"};
        //int[] widths = {100, 0, 100, 100, 100, 100, 100, 100, 100, 100};
        int[] widths = {0, 100, 100, 100, 100, 100, 100, 100, 100, 100};
        
        JTable table = new JTable(data, columns);
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        
        for (int i = 0; i < table.getColumnCount(); i++) {
            table.getColumn(table.getColumnName(i)).setPreferredWidth(widths[i]);
            table.getColumn(table.getColumnName(i)).setWidth(widths[i]);
            if(widths[i] == 0) {
                table.getColumn(table.getColumnName(i)).setMinWidth(0);
                table.getColumn(table.getColumnName(i)).setMaxWidth(0);
            } else {
                table.getColumn(table.getColumnName(i)).setMinWidth(10);
            }
        }
        
        return table;
    }

}

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

Release Regression From : 5.0u7
The above release value was the last known release where this
bug was not reproducible. Since then there has been a regression.