JSF validate on submit form

Question

I\'m working on a JSF 2.0 form, I have a managedbean with 2 fields

import java.util.Date;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.Reque         


        

Answer 1

Here's one of the ways:

with

@FacesValidator(value="dateValidator")
public class DateValidator implements Validator {

    @Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {
        UIInput sd = (UIInput)component.getAttributes().get("firstDate");
        Date firstDate = (Date)sd.getValue();
        Date secondDate = (Date)value;
        if(!firstDate.before(secondDate)){
            FacesMessage msg = new FacesMessage("Entered dates are invalid: first date must be before second date");
            throw new ValidatorException(msg);
        }
    }

}