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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.servlet;

import org.directwebremoting.extend.NamedConverter;
import org.directwebremoting.util.LocalUtil;

/**
 * A handler for DTO class generation requests
 * @author Mike Wilson [mikewse at hotmail dot com]
 */
public class DtoHandler extends BaseDtoHandler
{
    /* (non-Javadoc)
     * @see org.directwebremoting.servlet.BaseDtoHandler#getBaseDtoPath()
     */
    @Override
    protected String getBaseDtoPath()
    {
        return dtoHandlerUrl;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.servlet.BaseDtoHandler#generateDtoScript(java.lang.String)
     */
    @Override
    public String generateDtoScript(String contextPath, String servletPath, String jsClassName)
    {
        String script = null;

        String dtojs = remoter.generateDtoJavaScript(jsClassName, "    ", "c");
        if (dtojs != null)
        {
            StringBuilder buffer = new StringBuilder();

            buffer
                .append("(function() {\n")
                .append("  var c;\n")
                .append("  if (!dwr.engine._mappedClasses[\"" + jsClassName + "\"]) {\n");

            // Generate DTO
            buffer
                .append(dtojs)
                .append("    dwr.engine._setObject(\"" + jsClassName + "\", c);\n")
                .append("    dwr.engine._mappedClasses[\"" + jsClassName + "\"] = c;\n");

            // Generate inheritance
            NamedConverter namedConv = converterManager.getNamedConverter(jsClassName);
            String jsSuperClassName = namedConv.getJavascriptSuperClass();
            if (LocalUtil.hasLength(jsSuperClassName))
            {
                String classExpression = "dwr.engine._mappedClasses[\"" + jsClassName + "\"]";
                String superClassExpression = "dwr.engine._mappedClasses[\"" + jsSuperClassName + "\"]";
                buffer
                    .append(remoter.generateDtoInheritanceJavaScript("    ", classExpression, superClassExpression, "dwr.engine._delegate"));
            }

            buffer
                .append("  }\n")
                .append("})();\n");

            script = buffer.toString();
        }

        return script;
    }

    /**
     * Setter for the URL that this handler available on
     * @param dtoHandlerUrl the dtoHandlerUrl to set
     */
    public void setDtoHandlerUrl(String dtoHandlerUrl)
    {
        this.dtoHandlerUrl = dtoHandlerUrl;
    }

    /**
     * What URL is this handler available on?
     */
    protected String dtoHandlerUrl;
}