FULL PRODUCT VERSION :
java version "1.7.0-ea"
Java(TM) SE Runtime Environment (build 1.7.0-ea-b130)
Java HotSpot(TM) Client VM (build 21.0-b02, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
A NullPointerException occurs in JDK 7 when calling Container.remove() and the Component.removeNotify() has been overridden to retain the peer object.

This results from the addition, in Java 7, of the line:
    comp.setGraphicsConfiguration(null);
at
    java.awt.Container.remove(Container.java:1209)

REGRESSION.  Last worked in version 6u24

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Please run the test case, ScreenUpdateManagerNPE.main().

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Given test case is expected to run without exception on Java 7.
ACTUAL -
Given test case runs to completion on Java 6.  NPE occurs on Java 7.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at sun.java2d.ScreenUpdateManager.createScreenSurface(ScreenUpdateManager.java:86)
	at sun.java2d.d3d.D3DScreenUpdateManager.createScreenSurface(D3DScreenUpdateManager.java:161)
	at sun.awt.windows.WComponentPeer.createScreenSurface(WComponentPeer.java:424)
	at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java:448)
	at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java:416)
	at sun.awt.windows.WComponentPeer.updateGraphicsData(WComponentPeer.java:504)
	at java.awt.Component.updateGraphicsData(Component.java:1144)
	at java.awt.Component.setGraphicsConfiguration(Component.java:1130)
	at java.awt.Canvas.setGraphicsConfiguration(Canvas.java:79)
	at java.awt.Container.remove(Container.java:1209)
	at java.awt.Container.remove(Container.java:1253)
	at javax.swing.JFrame.remove(JFrame.java:585)
	at com.attachmate.bugdemo.ScreenUpdateManagerNPE$3.run(ScreenUpdateManagerNPE.java:45)
	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
	at java.awt.EventQueue.dispatchEvent(EventQueue.java:660)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
	at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
/**
 * Example class.
 */
package com.attachmate.bugdemo;

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

public class ScreenUpdateManagerNPE
{
    private static class MyCanvas extends Canvas
    {
        public void removeNotify() {} // retain surface

        public void releaseSurface()
        {
            super.removeNotify();
        }
    }

    private static final long VISIBLE_STEP_DELAY = 1000L;

    public static void main(String[] args) throws InterruptedException
    {
        final JFrame frame = new JFrame("ScreenUpdateManager NPE Demo");
        frame.getContentPane().setBackground(Color.blue);
        frame.setLayout(null);
        frame.setSize(200, 200);

        final MyCanvas canvas = new MyCanvas();
        canvas.setBackground(Color.green);
        canvas.setSize(50, 50);

        SwingUtilities.invokeLater(new Runnable() {public void run() {
            frame.setVisible(true);
        } });

        Thread.sleep(VISIBLE_STEP_DELAY);
        SwingUtilities.invokeLater(new Runnable() {public void run() {
            frame.add(canvas, 0);
        } });

        Thread.sleep(VISIBLE_STEP_DELAY);
        SwingUtilities.invokeLater(new Runnable() {public void run() {
            frame.remove(canvas);    // <-- NPE occurs here
            canvas.releaseSurface();
        } });

        Thread.sleep(VISIBLE_STEP_DELAY);
        System.exit(0);
    }
}

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