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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

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package org.directwebremoting.io;

import java.util.Collections;
import java.util.List;

/**
 * MatchedItems is simply a holder for a list of matched {@link Item}s and a
 * total match count, used by:
 * {@link org.directwebremoting.datasync.StoreProvider#viewRegion(StoreRegion)} and
 * {@link org.directwebremoting.datasync.StoreProvider#viewRegion(StoreRegion, StoreChangeListener)}
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class MatchedItems
{
    /**
     * If there is data to return, then both of these must be set.
     * Note that totalMatchCount == viewedMatches.size() ONLY when there is
     * no filtering going on.
     * @param viewedMatches ...
     * @param totalMatchCount ...
     */
    public MatchedItems(List viewedMatches, int totalMatchCount)
    {
        if (viewedMatches == null)
        {
            throw new NullPointerException("viewedMatches may not be null. Use the default constructor if you have no data");
        }
        this.viewedMatches = viewedMatches;

        this.totalMatchCount = totalMatchCount;
    }

    /**
     * The constructor to use of there are no items to transfer.
     */
    public MatchedItems()
    {
        this.viewedMatches = Collections.emptyList();
        this.totalMatchCount = 0;
    }

    /**
     * Accessor for the total number of matches (before start/count filtering)
     * @return ...
     */
    public int getTotalMatchCount()
    {
        return totalMatchCount;
    }

    /**
     * Accessor for the matched items (after start/count filtering)
     * @return ...
     */
    public List getViewedMatches()
    {
        return viewedMatches;
    }

    @Override
    public String toString()
    {
        return "MatchedItems[viewedMatches=" + viewedMatches + ",totalMatchCount=" + totalMatchCount + "]";
    }

    /**
     * @see #getTotalMatchCount()
     */
    private final int totalMatchCount;

    /**
     * @see #getViewedMatches()
     */
    private final List viewedMatches;
}