The testcase below shows that TableHeaders are not being painted properly.

***TESTCASE***
import java.awt.*;
import javax.swing.*;

class TableHeaderTest
{
  public static void main(String args[])
  {
    JFrame jf = new JFrame();
    JTable table;
    JScrollPane scrollPane;

    // Create columns names
    String columnNames[] = { "Column 1", "Column 2", "Column 3" };
    // Create some data
    String dataValues[][] =
      {
        { "12", "234", "67" },
        { "-123", "43", "853" },
        { "93", "89.2", "109" },
        { "279", "9033", "3092" }
      };
    
    // Create a new table instance
    table = new JTable( dataValues, columnNames );
    
    // Add the table to a scrolling pane
    scrollPane = new JScrollPane( table );
    jf.add( scrollPane, BorderLayout.CENTER );
    jf.setSize( 300, 200 );    
    jf.show();
  }
}