src/java.desktop/share/classes/java/awt/image/RGBImageFilter.java

@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 1995, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1995, 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
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this

@@ -65,10 +65,15 @@
  * @author      Jim Graham
  */
 public abstract class RGBImageFilter extends ImageFilter {
 
     /**
+     * Constructor for subclasses to call.
+     */
+    protected RGBImageFilter() {}
+
+    /**
      * The {@code ColorModel} to be replaced by
      * {@code newmodel} when the user calls
      * {@link #substituteColorModel(ColorModel, ColorModel) substituteColorModel}.
      */
     protected ColorModel origmodel;