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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.util;

import java.io.IOException;
import java.io.StringReader;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.xml.sax.EntityResolver;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;

/**
 * An EntityResolver for use when you don't want to do any entity resolving.
 * I think this is technically a violation of all sorts of things because the
 * DTD affects how a document is parsed, and this just dumps all DTDs. However
 * when you are not interested in validity, you just want to get information
 * when you know that the DTD won't affect the document, this could be useful.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class EmptyEntityResolver implements EntityResolver
{
    /* (non-Javadoc)
     * @see org.xml.sax.EntityResolver#resolveEntity(java.lang.String, java.lang.String)
     */
    public InputSource resolveEntity(String publicId, String systemId) throws SAXException, IOException
    {
        log.debug("resolveEntity(publicId=" + publicId + ", systemId=" + systemId + ") returning null");

        InputSource is = new InputSource(new StringReader(""));
        is.setPublicId(publicId);
        is.setSystemId(systemId);

        return is;
    }

    /**
     * The log stream
     */
    private static final Log log = LogFactory.getLog(EmptyEntityResolver.class);
}