src/java.base/share/classes/java/time/chrono/Ser.java

@@ -108,10 +108,11 @@
     static final byte CHRONO_PERIOD_TYPE = 9;
 
     /** The type being serialized. */
     private byte type;
     /** The object being serialized. */
+    @SuppressWarnings("serial") // Not statically typed as Serializable
     private Object object;
 
     /**
      * Constructor for deserialization.
      */