--- old/src/java.desktop/share/classes/javax/sound/sampled/spi/MixerProvider.java	2020-08-06 02:07:40.900872100 -0700
+++ new/src/java.desktop/share/classes/javax/sound/sampled/spi/MixerProvider.java	2020-08-06 02:07:40.312740500 -0700
@@ -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
@@ -40,6 +40,11 @@
 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.
      * <p>