src/java.base/share/classes/sun/reflect/annotation/ExceptionProxy.java

@@ -35,8 +35,9 @@
  *
  * @author  Josh Bloch
  * @since   1.5
  */
 public abstract class ExceptionProxy implements java.io.Serializable {
+    @java.io.Serial
     private static final long serialVersionUID = 7241930048386631401L;
     protected abstract RuntimeException generateException();
 }