jsf- validator with parameters from input

Question

here a part of my .xhtml page:

<h:inputText id="kartNumIn"  value="#{controller.mitarbeiter.kartenNummer}">
                <f:attribute name="foo" value="controller.mitarbeiter.id" />
                <f:validator validatorId="kartVal" binding="#{kartVal}" disabled="#{!controller.noUpdate}"/>
            </h:inputText>

here my validate-method():

@Override
    public void validate(FacesContext context, UIComponent component, Object value) throws ValidatorException {

        int id=(Integer) component.getAttributes().get("foo"); //always 0
        int temp = (Integer) value;

        if (!(value instanceof Integer)) {
            throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "Eingabefehler", "FEHLER:Bitte geben Sie eine Zahl ein!"));
        }

       System.out.print("Input"+value+"Aktuelle"+component.getAttributes().get("foo").toString());

        if (getAlleKartennummern().contains(temp) && temp!=id) {
            throw new ValidatorException(new FacesMessage(FacesMessage.SEVERITY_ERROR, "Kartennummerfehler", "FEHLER:Kartennumer bereits vergeben!"));
        }
    }

for my validator i need a second value. Here i need the mitarbeiter.id! for component.getAttributes().get("foo") i get always null....

Solution 1

I don't think that the OP is interested in the problem any more, but if someone else finds this question:

int id=(Integer) component.getAttributes().get("foo");

Will not work as you get a String. A little strange that you write that you always get null. You should get a:

java.lang.String cannot be cast to java.lang.Integer

If this is the case, try:

int id = Integer.parseInt((String) component.getAttributes().get("foo"));

Solution 2

In the attribute you need to set the value of the expression

<f:attribute name="foo" value="controller.mitarbeiter.id" />

it should be

<f:attribute name="foo" value="#{controller.mitarbeiter.id}" />

Comments

[BalusC]

I believe this is careless preparation of the question. OP mentioned that he got null, which would be impossible with a static string. The cause is more likely that the attribute value is dependent on a variable which is only known during view render time, such as the var of a <h:dataTable>.