Question

It is about validation in JSF. I know that there are two way for validation

1. Bean Validation
2. JSF Validation

I want to write my own validation class. Is it possible to add the custom validation class to JSF beans?

I don’t want to have the validation class in my facelett. Only in Bean…

Answer 1

Yes you can write your own validator class like this:

@FacesValidator("customValidator")
public class CustomValidator implements Validator{

    public void validate(FacesContext context, UIComponent component,
            Object value) throws ValidatorException {
        // do your validation here
    }
}

and use it in your facelets:

<h:inputText value="#{myBean.myValue}">
  <f:validator validatorId="customValidator" />
</h:inputText>

Note that the content of the @FacesValidator annotation must match the validatorId attribute of f:validator.

Furthermore jsf input elements have an validator attribute. You can use this attribute to delegate validation to a special method in you backing bean.

with

public void validateInput(FacesContext context, 
                          UIComponent component, Object object) {
  // your validation with 'object' here
}