--- old/src/java.desktop/share/classes/java/awt/dnd/DropTargetAdapter.java	2020-08-05 16:55:25.997267100 -0700
+++ new/src/java.desktop/share/classes/java/awt/dnd/DropTargetAdapter.java	2020-08-05 16:55:25.421138500 -0700
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2001, 2003, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2001, 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
@@ -73,6 +73,11 @@
 public abstract class DropTargetAdapter implements DropTargetListener {
 
     /**
+     * Constructs a {@code DropTargetAdapter}.
+     */
+    protected DropTargetAdapter() {}
+
+    /**
      * Called while a drag operation is ongoing, when the mouse pointer enters
      * the operable part of the drop site for the {@code DropTarget}
      * registered with this listener.