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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 boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.directwebremoting.datasync;

import java.util.HashMap;
import java.util.Map;

/**
 * A way to find {@link StoreProvider}s that people wish to expose to the
 * outside world.
 * Warning. This API may well get wrapped in a Factory like the other DWR
 * services.
 * TODO: decide if we want to wrap this
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class Directory
{
    /**
     * Register a StoreProvider for access by the outside world
     * @param storeId The id by which the store can be reached
     * @param provider The store provider that holds the Map of data
     */
    public static void register(String storeId, StoreProvider provider)
    {
        providers.put(storeId, provider);
    }

    /**
     * Remove the registration of a StoreProvider
     * @param storeId The id by which the store can be reached
     */
    public static void unregister(String storeId)
    {
        providers.remove(storeId);
    }

    /**
     * Look up the StoreProvider by ID.
     * @param storeId The id by which the store can be reached
     * @return The found StoreProvider or null if one is not found.
     */
    @SuppressWarnings("unchecked")
    public static  StoreProvider getRegistration(String storeId, @SuppressWarnings("unused") Class type)
    {
        return (StoreProvider) providers.get(storeId);
    }

    /**
     * Internal map of stores
     */
    private static Map> providers = new HashMap>();
}