CollectionBean.java

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package com.sun.faces.test.servlet40.facelets;

import static java.util.Arrays.asList;

import java.util.AbstractCollection;
import java.util.Collection;
import java.util.Iterator;

import javax.faces.bean.ManagedBean;

@ManagedBean
public class CollectionBean {

    public Collection<Integer> getCollection() {
        return new TestCollection<>(asList(1, 2, 3));
    }

    private static class TestCollection<E> extends AbstractCollection<E> {

        private final Collection<E> collection;

        public TestCollection(Collection<E> collection) {
            this.collection = collection;
        }

        @Override
        public Iterator<E> iterator() {
            return collection.iterator();
        }

        @Override
        public int size() {
            return collection.size();
        }
    }

}