--- old/src/java.base/share/classes/java/time/Ser.java	2019-08-27 17:28:31.954324386 -0700
+++ new/src/java.base/share/classes/java/time/Ser.java	2019-08-27 17:28:31.770324386 -0700
@@ -91,6 +91,7 @@
     /**
      * Serialization version.
      */
+    @java.io.Serial
     private static final long serialVersionUID = -7683839454370182990L;
 
     static final byte DURATION_TYPE = 1;
@@ -277,6 +278,7 @@
      *
      * @return the read object, should never be null
      */
+    @java.io.Serial
     private Object readResolve() {
          return object;
     }