--- old/src/java.base/share/classes/java/lang/Long.java	2019-08-27 17:27:25.590324386 -0700
+++ new/src/java.base/share/classes/java/lang/Long.java	2019-08-27 17:27:25.278324386 -0700
@@ -2000,5 +2000,6 @@
     }
 
     /** use serialVersionUID from JDK 1.0.2 for interoperability */
+    @java.io.Serial
     @Native private static final long serialVersionUID = 4290774380558885855L;
 }