--- old/src/java.desktop/share/classes/java/awt/font/LineMetrics.java	2020-08-17 10:55:44.701536228 +0100
+++ new/src/java.desktop/share/classes/java/awt/font/LineMetrics.java	2020-08-17 10:55:44.549532937 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1998, 2003, 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
@@ -43,6 +43,10 @@
 
 public abstract class LineMetrics {
 
+    /**
+     * Constructor for subclasses to call.
+     */
+    public LineMetrics() {}
 
     /**
      * Returns the number of characters ({@code char} values) in the text whose