src/java.base/share/classes/java/lang/Number.java

@@ -117,7 +117,8 @@
     public short shortValue() {
         return (short)intValue();
     }
 
     /** use serialVersionUID from JDK 1.0.2 for interoperability */
+    @java.io.Serial
     private static final long serialVersionUID = -8742448824652078965L;
 }