src/java.base/share/classes/java/util/SimpleTimeZone.java

@@ -1240,10 +1240,11 @@
      * @since 1.4
      */
     public static final int UTC_TIME = 2;
 
     // Proclaim compatibility with 1.1
+    @java.io.Serial
     static final long serialVersionUID = -403250971215465050L;
 
     // the internal serial version which says which version was written
     // - 0 (default) for version up to JDK 1.1.3
     // - 1 for version from JDK 1.1.4, which includes 3 new fields

@@ -1634,10 +1635,11 @@
      * <code>endDay</code>, and <code>endDayOfWeek</code>.  The values of these
      * fields in the required section are approximate values suited to the rule
      * mode <code>DOW_IN_MONTH_MODE</code>, which is the only mode recognized by
      * JDK 1.1.
      */
+    @java.io.Serial
     private void writeObject(ObjectOutputStream stream)
          throws IOException
     {
         // Construct a binary rule
         byte[] rules = packRules();

@@ -1664,10 +1666,11 @@
      * Reconstitute this object from a stream (i.e., deserialize it).
      *
      * We handle both JDK 1.1
      * binary formats and full formats with a packed byte array.
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream stream)
          throws IOException, ClassNotFoundException
     {
         stream.defaultReadObject();