--- old/src/java.base/share/classes/java/time/chrono/Ser.java	2019-08-27 17:28:42.742324386 -0700
+++ new/src/java.base/share/classes/java/time/chrono/Ser.java	2019-08-27 17:28:42.546324386 -0700
@@ -94,6 +94,7 @@
     /**
      * Serialization version.
      */
+    @java.io.Serial
     private static final long serialVersionUID = -6103370247208168577L;
 
     static final byte CHRONO_TYPE = 1;
@@ -249,6 +250,7 @@
      *
      * @return the read object, should never be null
      */
+    @java.io.Serial
     private Object readResolve() {
          return object;
     }