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

@@ -71,10 +71,11 @@
      * @serial
      */
     private final boolean value;
 
     /** use serialVersionUID from JDK 1.0.2 for interoperability */
+    @java.io.Serial
     private static final long serialVersionUID = -3665804199014368530L;
 
     /**
      * Allocates a {@code Boolean} object representing the
      * {@code value} argument.