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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.extend;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * A handler is a very simple servlet that does not differentiate between GET
 * and POST, or need complex setup beyond what the container can provide
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface Handler
{
    /**
     * Handle a URL request that has been mapped to this Handler
     * @param request The HTTP request data
     * @param response Where we write the HTTP response data
     * @throws IOException If the write process fails
     */
    public void handle(HttpServletRequest request, HttpServletResponse response) throws IOException;
}