java - how to remove the warning The serializable class ClASSNAME does not declare a static final serialVersionUID field of type long

I create a class which extends Exception class, I got this warning on Eclipse

The serializable class PhoneAlreadyExists does not declare a static
final serialVersionUID field of type long

how to remove it please ?

public class PhoneAlreadyExists extends Exception {

    public PhoneAlreadyExists() {
        // TODO Auto-generated constructor stub
        super();
    }

    PhoneAlreadyExists(String message) {
        super(message);
    }

}

Answer

Add an annotation @SuppressWarnings("serial") on your class, to ignore that warning