--- old/src/java.base/share/classes/java/io/ObjectInputStream.java	2019-09-06 11:11:22.838589001 -0700
+++ new/src/java.base/share/classes/java/io/ObjectInputStream.java	2019-09-06 11:11:22.646589001 -0700
@@ -1321,6 +1321,10 @@
      * Provide access to the persistent fields read from the input stream.
      */
     public abstract static class GetField {
+        /**
+         * Constructor for subclasses to call.
+         */
+        public GetField() {}
 
         /**
          * Get the ObjectStreamClass that describes the fields in the stream.