src/java.base/share/classes/java/time/chrono/ThaiBuddhistDate.java

@@ -108,10 +108,11 @@
         implements ChronoLocalDate, Serializable {
 
     /**
      * Serialization version.
      */
+    @java.io.Serial
     private static final long serialVersionUID = -8722293800195731463L;
 
     /**
      * The underlying date.
      */

@@ -479,10 +480,11 @@
      * Defend against malicious streams.
      *
      * @param s the stream to read
      * @throws InvalidObjectException always
      */
+    @java.io.Serial
     private void readObject(ObjectInputStream s) throws InvalidObjectException {
         throw new InvalidObjectException("Deserialization via serialization delegate");
     }
 
     /**

@@ -496,10 +498,11 @@
      *  out.writeByte(get(DAY_OF_MONTH));
      * </pre>
      *
      * @return the instance of {@code Ser}, not null
      */
+    @java.io.Serial
     private Object writeReplace() {
         return new Ser(Ser.THAIBUDDHIST_DATE_TYPE, this);
     }
 
     void writeExternal(DataOutput out) throws IOException {