FULL PRODUCT VERSION :
java 1.6.0_39 and java 1.7.0_13

ADDITIONAL OS VERSION INFORMATION :
windows 8 6.2

A DESCRIPTION OF THE PROBLEM :
When a JSpinner is changed by mouse click it shows an unmotivated ugly black line inside the upper part of the text area

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
start the added application an click into the spinner to increase its values.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Proper painting inside a spinner, no unmotivated dirty regions
ACTUAL -
Not proper painting with unmotivated black line at the top of the spinners text area

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package com.classwizard.cw;


import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;

import javax.swing.Box;
import javax.swing.JDesktopPane;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JSpinner;
import javax.swing.SpinnerNumberModel;
import javax.swing.WindowConstants;


public class ClassWizard extends Object
{
    public static void main(String args[]) throws Exception
    {
        try
        {
            DialogTest ket = new DialogTest();
            GJApp.launch(ket, " ButtonTest " ,0,0,700,700,null);
        }
        catch (Exception e)
        {
            System.out.println(e.getMessage());
            e.printStackTrace();
        }
    }
}
class GJApp extends WindowAdapter
{
    public static void launch(final DialogTest f, String title,final int x, final int y,final int w, int h,String propertiesFilename)
    {
        f.setTitle(title);
        f.setBounds(x,y,w,h);
        f.setVisible(true);
        f.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
        f.addWindowListener(new WindowAdapter()
        {
            public void windowClosed(WindowEvent e)
            {
                System.exit(0);
            }
        });
    }
}

class DialogTest extends JFrame
{
    protected JDesktopPane desktopPane = new JDesktopPane();
    SpinnerDialog _buttondlg = null;
    
    protected File outfile = null;
    boolean _even = true;
    int _flickercount = 0;
    javax.swing.Timer _timer = null;

    
    public DialogTest() throws Exception
    {
        String osname = System.getProperty( " os.name " );
        String osversion = System.getProperty( " os.version " );
        String java_version = System.getProperty( " java.version " );
        System.out.println(osname + " " + osversion + " java: " + java_version + "
 " );
        
        // make a dialog with a drag button
        _buttondlg = new SpinnerDialog(this, " spinner " , false);
        _buttondlg.init();
        _buttondlg.setVisible(true);
        _buttondlg.setLocation(300, 100);

    }
}

class SpinnerDialog extends JDialog
{
    SpinnerDialog _dlg = null;
    DialogTest _owner = null;
    JSpinner oneSpinner = null;
    
    public SpinnerDialog(DialogTest owner, String title, boolean modal)
    {
        super(owner,title,modal);
        _owner = owner;
        _dlg = this;
    }

    public JPanel makeButtonsPanel()
    {
        GridBagLayout gbl = new GridBagLayout();
        GridBagConstraints gbc = new GridBagConstraints();
        oneSpinner = new JSpinner(new SpinnerNumberModel(1,1,100,1));

        JPanel paraPanel = new JPanel();
        paraPanel.setLayout(gbl);
        paraPanel.setPreferredSize(new Dimension(150, 150));

        paraPanel.add(Box.createHorizontalStrut(10));
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        paraPanel.add(oneSpinner, gbc);
        
        
        return(paraPanel);
    }
    public void init()
    {
        JPanel paraPanel2 = makeButtonsPanel();
        Container diacontent = this.getContentPane();
        diacontent.add(paraPanel2, BorderLayout.NORTH);
        setPreferredSize(new Dimension(280, 150));
        setResizable(true);
        pack();
    }
}
    

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