1 /*
   2  * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.util.Objects;
  25 
  26 import javax.sound.midi.MidiDevice;
  27 import javax.sound.midi.MidiSystem;
  28 import javax.sound.midi.spi.MidiDeviceProvider;
  29 
  30 import static java.util.ServiceLoader.load;
  31 
  32 /**
  33  * @test
  34  * @bug 8143909
  35  * @author Sergey Bylokhov
  36  */
  37 public final class ExpectedNPEOnNull {
  38 
  39     public static void main(final String[] args) throws Exception {
  40         testMS();
  41         for (final MidiDeviceProvider mdp : load(MidiDeviceProvider.class)) {
  42             testMDP(mdp);
  43         }
  44         testMDP(customMDP);
  45     }
  46 
  47     /**
  48      * Tests the part of MidiSystem API, which implemented via
  49      * MidiDeviceProvider.
  50      */
  51     private static void testMS() throws Exception {
  52         // MidiSystem#getMidiDevice(MidiDevice.Info)
  53         try {
  54             MidiSystem.getMidiDevice(null);
  55             throw new RuntimeException("NPE is expected");
  56         } catch (final NullPointerException ignored) {
  57         }
  58     }
  59 
  60     /**
  61      * Tests the MidiDeviceProvider API directly.
  62      */
  63     private static void testMDP(final MidiDeviceProvider mdp) throws Exception {
  64         // MidiDeviceProvider#isDeviceSupported(Info)
  65         try {
  66             mdp.isDeviceSupported(null);
  67             throw new RuntimeException("NPE is expected");
  68         } catch (final NullPointerException ignored) {
  69         }
  70         // MidiDeviceProvider#getDevice(Info)
  71         try {
  72             mdp.getDevice(null);
  73             throw new RuntimeException("NPE is expected");
  74         } catch (final NullPointerException ignored) {
  75         }
  76     }
  77 
  78     /**
  79      * Tests some default implementation of MidiDeviceProvider API, using the
  80      * custom {@code MidiDeviceProvider}, which support nothing.
  81      */
  82     static MidiDeviceProvider customMDP = new MidiDeviceProvider() {
  83         @Override
  84         public MidiDevice.Info[] getDeviceInfo() {
  85             return new MidiDevice.Info[0];
  86         }
  87 
  88         @Override
  89         public MidiDevice getDevice(MidiDevice.Info info) {
  90             Objects.requireNonNull(info);
  91             return null;
  92         }
  93     };
  94 }