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 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
/*
 * @test
 * @bug 8191639
 * @headful
 * @summary  Verifies no NPE is thrown wjen pageup/down is pressed in a JList
 * @run main BasicListTest
 */

import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.event.InputEvent;
import java.awt.event.KeyEvent;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

class MyList extends JList {
    // I need this to be able to unselect when clicking outside list content
    @Override
    public int locationToIndex(final Point location) {
        final int n = super.locationToIndex(location);
        //return n;
        final Rectangle q = getCellBounds(n, n);
        return q != null && q.contains(location)?n:-1;
    }
}

public class BasicListTest {
    private static void initComponents() {
        f = new JFrame();
        jScrollPane1 = new JScrollPane();
        list1 = new MyList();

        f.setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        list1.setModel(new javax.swing.AbstractListModel() {
            String[] strings = { "Item 1", "Item 2", "Item 3", "Item 4", "Item 5" };
            @Override
            public int getSize() { return strings.length; }
            @Override
            public Object getElementAt(int i) { return strings[i]; }
        });
        jScrollPane1.setViewportView(list1);

        f.getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);

        f.pack();
        f.setVisible(true);
        p = list1.getLocationOnScreen();
    }

    private static void setLookAndFeel(final UIManager.LookAndFeelInfo laf) {
        try {
            UIManager.setLookAndFeel(laf.getClassName());
        } catch (ClassNotFoundException | InstantiationException |
                 UnsupportedLookAndFeelException | IllegalAccessException e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String args[]) throws Exception {
        for (UIManager.LookAndFeelInfo laf : UIManager.getInstalledLookAndFeels()) {
            try {
                SwingUtilities.invokeAndWait(() -> setLookAndFeel(laf));
                System.out.println("Test for LookAndFeel " + laf.getClassName());
                SwingUtilities.invokeAndWait(() -> {
                    initComponents();
                });
                System.out.println("Test passed for LookAndFeel " + laf.getClassName());
            }  catch (Exception e) {
                throw new RuntimeException(e);
            }

            Robot robot = new Robot();
            robot.setAutoDelay(200);
            robot.mouseMove(p.x, p.y);
            robot.waitForIdle();
            robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
            robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
            robot.waitForIdle();
            robot.keyPress(KeyEvent.VK_PAGE_DOWN);
            robot.keyRelease(KeyEvent.VK_PAGE_DOWN);

            try {
                Thread.sleep(1000);
            } catch (InterruptedException ex) {
            }
            SwingUtilities.invokeAndWait(() -> {
                f.dispose();
            });
        }
    }

    private static JScrollPane jScrollPane1;
    private static MyList list1;
    private static Point p;
    private static JFrame f;

}