src/java.base/share/classes/java/io/ObjectInputStream.java

@@ -1319,10 +1319,14 @@
 
     /**
      * 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.
          *
          * @return  the descriptor class that describes the serializable fields