FULL PRODUCT VERSION :
Java 1.6.0_39 and also Java 1.7.0_13

ADDITIONAL OS VERSION INFORMATION :
Windows 8 6.2

A DESCRIPTION OF THE PROBLEM :
In a JDialog with JRadioButton and JCheckBox dirty regions (black lines) are remaining after they are touched with the mouse cursor. The JRadioButton shows always a dirty black line at the top and a white dirty region inside the black circle if it is selected.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Start the added application and move the mouse over the shown dialog.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
no dirty lines remaining in a dialog, if JRadioButton and JCheckBox is touched by the mouse cursor and a proper painted JRadioButton.
ACTUAL -
dirty lines remaining in a dialog, if JRadioButton and JCheckBox is touched by the mouse cursor and a dirty painted JRadioButton with a black line on top and white dirty region inside the black circle if it is selected..

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 javax.swing.Box;
import javax.swing.ButtonGroup;
import javax.swing.JCheckBox;
import javax.swing.JDesktopPane;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
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();
    ButtonDialog _buttondlg = 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 radio button and checkbox
        _buttondlg = new ButtonDialog(this, " buttons and checkboxes " , false);
        _buttondlg.init();
        _buttondlg.setVisible(true);
        _buttondlg.setLocation(300, 100);

    }
}

class ButtonDialog extends JDialog{
    ButtonDialog _dlg = null;
    DialogTest _owner = null;
    JRadioButton oneButton = null;
    JRadioButton twoButton = null;
    JCheckBox oneBox = null;
    JCheckBox twoBox = null;
    
    public ButtonDialog(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();
        oneButton = new JRadioButton( " button 1 " );
        twoButton = new JRadioButton( " button 2 " );
        oneButton.setSelected(true);
        ButtonGroup group = new ButtonGroup();
        group.add(oneButton);
        group.add(twoButton);

        oneBox = new JCheckBox( " check 1 " );
        twoBox = new JCheckBox( " check 2 " );
        JPanel paraPanel = new JPanel();
        paraPanel.setPreferredSize(new Dimension(150, 150));

        paraPanel.add(Box.createHorizontalStrut(10));
        gbc.gridwidth = 1;
        paraPanel.add(oneButton, gbc);
        paraPanel.add(Box.createHorizontalStrut(10));
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        paraPanel.add(oneBox, gbc);
        
        paraPanel.add(Box.createHorizontalStrut(10));
        gbc.gridwidth = 1;
        paraPanel.add(twoButton, gbc);
        paraPanel.add(Box.createHorizontalStrut(10));
        gbc.gridwidth = GridBagConstraints.REMAINDER;
        paraPanel.add(twoBox, 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 ----------