How to create a custom EL function to invoke a static method?

Question

Im new to JSF 2. My question is related to BalusC\'s answer to this question jsf2 ajax update parts based on request parameters I tried the kickstart code BalusC posted and

Answer 1

First create a final class with a public static method which does exactly the job you want:

package com.example;

import java.util.Collection;

public final class Functions {

    private Functions() {
        // Hide constructor.
    }

    public static boolean contains(Collection