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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.servlet;

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

/**
 * A handler for dtoall generation requests
 * @author Mike Wilson [mikewse at hotmail dot com]
 */
public class DtoAllHandler extends BaseDtoAllHandler
{
    /**
     * Generates the full dtoall script by decorating the DTO classes returned by the Remoter.
     * @return string containing dtoall script
     */
    @Override
    public String generateDtoAllScript(String contextPath, String servletPath)
    {
        StringBuilder buffer = new StringBuilder();

        buffer
            .append("(function() {\n")
            .append("  var c;\n")
            .append("  var addedNow = [];\n");

        // DTO class definitions
        for (String jsClassName : converterManager.getNamedConverterJavaScriptNames())
        {
            buffer
                .append("\n")
                .append("  if (!dwr.engine._mappedClasses[\"" + jsClassName + "\"]) {\n")
                .append(remoter.generateDtoJavaScript(jsClassName, "    ", "c"))
                .append("    dwr.engine._setObject(\"" + jsClassName + "\", c);\n")
                .append("    dwr.engine._mappedClasses[\"" + jsClassName + "\"] = c;\n")
                .append("    addedNow[\"" + jsClassName + "\"] = true;\n")
                .append("  }\n");
        }

        // DTO superclass definitions
        for (String jsClassName : converterManager.getNamedConverterJavaScriptNames())
        {
            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("\n")
                    .append("  if (addedNow[\"" + jsClassName + "\"]) {\n")
                    .append(remoter.generateDtoInheritanceJavaScript("    ", classExpression, superClassExpression, "dwr.engine._delegate"))
                    .append("  }\n");
            }
        }

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

        return buffer.toString();
    }
}