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

@@ -43,10 +43,11 @@
  * @serial exclude
  */
 
 public class InvalidPropertiesFormatException extends IOException {
 
+    @java.io.Serial
     private static final long serialVersionUID = 7763056076009360219L;
 
     /**
      * Constructs an InvalidPropertiesFormatException with the specified
      * cause.

@@ -72,20 +73,22 @@
 
     /**
      * Throws NotSerializableException, since InvalidPropertiesFormatException
      * objects are not intended to be serializable.
      */
+    @java.io.Serial
     private void writeObject(java.io.ObjectOutputStream out)
         throws NotSerializableException
     {
         throw new NotSerializableException("Not serializable.");
     }
 
     /**
      * Throws NotSerializableException, since InvalidPropertiesFormatException
      * objects are not intended to be serializable.
      */
+    @java.io.Serial
     private void readObject(java.io.ObjectInputStream in)
         throws NotSerializableException
     {
         throw new NotSerializableException("Not serializable.");
     }