Faces Converter for User entity, used for recipients

UserEntityFacesConverter.java

import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;
import javax.faces.convert.Converter;
import javax.faces.convert.FacesConverter;

@FacesConverter("recipient")
public class RecipientConverter implements Converter {

    @Override
    public Object getAsObject(FacesContext facesContext, UIComponent uiComponent, String s) {
        User user = null;
        if (null != s) {
            user = new user();
            user.setUsername(s);
        }
        return user;
    }

    @Override
    public String getAsString(FacesContext facesContext, UIComponent uiComponent, Object o) {
        String r = "";
        if (o instanceof User) {
            User user = (User) o;
            r = user.getUsername();
        } else if (o instanceof String) {
            r = (String) o;
        }
        return r;
    }
}