--- a/src/java.base/share/classes/java/io/ObjectOutputStream.java	Sat Aug 24 09:31:15 2019 +0530
+++ b/src/java.base/share/classes/java/io/ObjectOutputStream.java	Mon Sep 09 10:13:42 2019 -0700
@@ -879,6 +879,10 @@
      * @since 1.2
      */
     public abstract static class PutField {
+        /**
+         * Constructor for subclasses to call.
+         */
+        public PutField() {}
 
         /**
          * Put the value of the named boolean field into the persistent field.