--- old/src/java.desktop/share/classes/javax/print/StreamPrintServiceFactory.java	2020-08-17 10:55:48.945627427 +0100
+++ new/src/java.desktop/share/classes/javax/print/StreamPrintServiceFactory.java	2020-08-17 10:55:48.781623923 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2000, 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
@@ -53,6 +53,11 @@
 public abstract class StreamPrintServiceFactory {
 
     /**
+     * Constructor for subclasses to call.
+     */
+    public StreamPrintServiceFactory() {}
+
+    /**
      * Contains a list of factories.
      */
     static class Services {