Почему PageableListView не имеет конструктора без модели или списка

В моем приложении мне нужно, чтобы pageableListView сочетался с propertyListView. Я просто удивляюсь, почему у pageableListView нет contructor без модели или списка. Я просто создаю новый класс, который расширяет свойствоListView и имеет тело с помощью pageableListView и один дополнительный конструктор только с строкой = id и количеством строк. Теперь он выглядит хорошо, и он работает. Я пропустил что-то, что это не должно работать иногда?

package org.toursys.web.components;

import java.util.List;

import org.apache.wicket.markup.html.list.ListView;
import org.apache.wicket.markup.html.list.PropertyListView;
import org.apache.wicket.model.IModel;

public abstract class PropertyPageableListView<T> extends PropertyListView<T> implements IPageableItems {
    private static final long serialVersionUID = 1L;

    /** The page to show. */
    private int currentPage;

    /** Number of rows per page of the list view. */
    private int itemsPerPage;

    /**
     * Constructor
     * 
     * @param id
     *            See Component
     * @param model
     *            See Component
     * @param itemsPerPage
     *            Number of rows to show on a page
     */
    public PropertyPageableListView(final String id, int itemsPerPage) {
        super(id);
        this.itemsPerPage = itemsPerPage;
    }

    /**
     * Constructor
     * 
     * @param id
     *            See Component
     * @param model
     *            See Component
     * @param itemsPerPage
     *            Number of rows to show on a page
     */
    public PropertyPageableListView(final String id, final IModel<? extends List<? extends T>> model, int itemsPerPage) {
        super(id, model);
        this.itemsPerPage = itemsPerPage;
    }

    /**
     * Creates a pageable list view having the given number of rows per page that uses the provided object as a simple
     * model.
     * 
     * @param id
     *            See Component
     * @param list
     *            See Component
     * @param itemsPerPage
     *            Number of rows to show on a page
     * @see ListView#ListView(String, List)
     */
    public PropertyPageableListView(final String id, final List<? extends T> list, final int itemsPerPage) {
        super(id, list);
        this.itemsPerPage = itemsPerPage;
    }

    /**
     * Gets the index of the current page being displayed by this list view.
     * 
     * @return Returns the currentPage.
     */
    public final int getCurrentPage() {
        // If first cell is out of range, bring page back into range
        while ((currentPage > 0) && ((currentPage * itemsPerPage) >= getItemCount())) {
            currentPage--;
        }

        return currentPage;
    }

    /**
     * Gets the number of pages in this list view.
     * 
     * @return The number of pages in this list view
     */
    public final int getPageCount() {
        return ((getItemCount() + itemsPerPage) - 1) / itemsPerPage;
    }

    /**
     * Gets the maximum number of rows on each page.
     * 
     * @return the maximum number of rows on each page.
     */
    public final int getItemsPerPage() {
        return itemsPerPage;
    }

    /**
     * Sets the maximum number of rows on each page.
     * 
     * @param itemsPerPage
     *            the maximum number of rows on each page.
     */
    public final void setItemsPerPage(int itemsPerPage) {
        if (itemsPerPage < 0) {
            itemsPerPage = 0;
        }

        addStateChange();
        this.itemsPerPage = itemsPerPage;
    }

    /**
     * @return offset of first item
     */
    public int getFirstItemOffset() {
        return getCurrentPage() * getItemsPerPage();
    }

    /**
     * @see org.apache.wicket.markup.html.navigation.paging.IPageableItems#getItemCount()
     */
    public int getItemCount() {
        return getList().size();
    }

    /**
     * @see org.apache.wicket.markup.html.list.ListView#getViewSize()
     */
    @Override
    public int getViewSize() {
        if (getDefaultModelObject() != null) {
            super.setStartIndex(getFirstItemOffset());
            super.setViewSize(getItemsPerPage());
        }

        return super.getViewSize();
    }

    /**
     * Sets the current page that this list view should show.
     * 
     * @param currentPage
     *            The currentPage to set.
     */
    public final void setCurrentPage(int currentPage) {
        if (currentPage < 0) {
            currentPage = 0;
        }

        int pageCount = getPageCount();
        if ((currentPage > 0) && (currentPage >= pageCount)) {
            currentPage = pageCount - 1;
        }

        addStateChange();
        this.currentPage = currentPage;
    }

    /**
     * Prevent users from accidentally using it.
     * 
     * @see org.apache.wicket.markup.html.list.ListView#setStartIndex(int)
     * @throws UnsupportedOperationException
     *             always
     */
    @Override
    public ListView<T> setStartIndex(int startIndex) throws UnsupportedOperationException {
        throw new UnsupportedOperationException("You must not use setStartIndex() with PageableListView");
    }

    /**
     * Prevent users from accidentally using it.
     * 
     * @param size
     *            the view size
     * @return This
     * @throws UnsupportedOperationException
     *             always
     * @see org.apache.wicket.markup.html.list.ListView#setStartIndex(int)
     */
    @Override
    public ListView<T> setViewSize(int size) throws UnsupportedOperationException {
        throw new UnsupportedOperationException("You must not use setViewSize() with PageableListView");
    }

}