8250858: Address reliance on default constructors in the Java Sound APIs

Reviewed-by: prr

src/java.desktop/share/classes/javax/sound/midi/VoiceStatus.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1998, 2020, 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
@@ -142,4 +142,9 @@ public class VoiceStatus {
      * @see #active
      */
     public int volume = 0;
+
+    /**
+     * Constructs a {@code VoiceStatus}.
+     */
+    public VoiceStatus() {}
 }

src/java.desktop/share/classes/javax/sound/midi/spi/MidiDeviceProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, 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
@@ -38,6 +38,11 @@ import javax.sound.midi.MidiDevice;
  */
 public abstract class MidiDeviceProvider {
 
+    /**
+     * Constructs a {@code MidiDeviceProvider}.
+     */
+    protected MidiDeviceProvider() {}
+
     /**
      * Indicates whether the device provider supports the device represented by
      * the specified device info object.

src/java.desktop/share/classes/javax/sound/midi/spi/MidiFileReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, 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
@@ -45,6 +45,11 @@ import javax.sound.midi.Sequence;
  */
 public abstract class MidiFileReader {
 
+    /**
+     * Constructs a {@code MidiFileReader}.
+     */
+    protected MidiFileReader() {}
+
     /**
      * Obtains the MIDI file format of the input stream provided. The stream
      * must point to valid MIDI file data. In general, MIDI file readers may

src/java.desktop/share/classes/javax/sound/midi/spi/MidiFileWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, 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
@@ -42,6 +42,11 @@ import javax.sound.midi.Sequence;
  */
 public abstract class MidiFileWriter {
 
+    /**
+     * Constructs a {@code MidiFileWriter}.
+     */
+    protected MidiFileWriter() {}
+
     /**
      * Obtains the set of MIDI file types for which file writing support is
      * provided by this file writer.

src/java.desktop/share/classes/javax/sound/midi/spi/SoundbankReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, 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
@@ -44,6 +44,11 @@ import javax.sound.midi.Synthesizer;
  */
 public abstract class SoundbankReader {
 
+    /**
+     * Constructs a {@code SoundbankReader}.
+     */
+    protected SoundbankReader() {}
+
     /**
      * Obtains a soundbank object from the {@code URL} provided.
      *

src/java.desktop/share/classes/javax/sound/sampled/spi/AudioFileReader.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, 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
@@ -44,6 +44,11 @@ import javax.sound.sampled.UnsupportedAudioFileException;
  */
 public abstract class AudioFileReader {
 
+    /**
+     * Constructs an {@code AudioFileReader}.
+     */
+    protected AudioFileReader() {}
+
     /**
      * Obtains the audio file format of the input stream provided. The stream
      * must point to valid audio file data. In general, audio file readers may

src/java.desktop/share/classes/javax/sound/sampled/spi/AudioFileWriter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, 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
@@ -45,6 +45,11 @@ import static javax.sound.sampled.AudioFileFormat.Type;
  */
 public abstract class AudioFileWriter {
 
+    /**
+     * Constructs an {@code AudioFileWriter}.
+     */
+    protected AudioFileWriter() {}
+
     /**
      * Obtains the file types for which file writing support is provided by this
      * audio file writer.

src/java.desktop/share/classes/javax/sound/sampled/spi/FormatConversionProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, 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
@@ -51,6 +51,11 @@ import static javax.sound.sampled.AudioFormat.Encoding;
  */
 public abstract class FormatConversionProvider {
 
+    /**
+     * Constructs a {@code FormatConversionProvider}.
+     */
+    protected FormatConversionProvider() {}
+
     /**
      * Obtains the set of source format encodings from which format conversion
      * services are provided by this provider.

src/java.desktop/share/classes/javax/sound/sampled/spi/MixerProvider.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2020, 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
@@ -39,6 +39,11 @@ import javax.sound.sampled.Mixer;
  */
 public abstract class MixerProvider {
 
+    /**
+     * Constructs a {@code MixerProvider}.
+     */
+    protected MixerProvider() {}
+
     /**
      * Indicates whether the mixer provider supports the mixer represented by
      * the specified mixer info object.