test/jdk/javax/swing/UIManager/UIManagerSetLookAndFeelNPETest.java

/*
 * Copyright (c) 2018, 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 8153532
 * @summary Verifies that SetLookAndFeel(String) throws NPE when className is
 *           null
 * @run main UIManagerSetLookAndFeelNPETest
 */

import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class UIManagerSetLookAndFeelNPETest {
    public static void main(String[] args)
            throws ClassNotFoundException, UnsupportedLookAndFeelException,
            InstantiationException, IllegalAccessException
    {
        boolean NPEThrown = false;
        try {
            UIManager.setLookAndFeel((String)null);
        } catch (NullPointerException e) {
            NPEThrown = true;
        }

        if (!NPEThrown) {
            throw new RuntimeException("A NullPointerException is expected " +
                    "from setLookAndFeel(String), if the className is null");
        }
    }
}