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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 java.io.IOException;

/**
 * A Handler that supports requests for engine.js compatible with the Dojo format.
 * @author Mike Wilson
 */
public class DojoEngineHandler extends BaseEngineHandler
{
    /* (non-Javadoc)
     * @see org.directwebremoting.servlet.FileJavaScriptHandler#generateTemplate(jakarta.servlet.http.HttpServletRequest, jakarta.servlet.http.HttpServletResponse)
     */
    @Override
    protected String generateTemplate(String contextPath, String servletPath, String pathInfo) throws IOException
    {
        DojoModule mod = new DojoModule(contextPath, servletPath, dojoDwrBaseModulePath, "engine");

        // Capture the DWR namespace if not mapped to standard "dwr" path
        boolean remap = !dojoDwrBaseModulePath.equals("dwr");
        if (remap)
        {
            mod.addContent("(function(dwr) {\n");
            mod.addContent("\n");
        }

        // Add standard engine.js contents
        mod.addContent(super.generateTemplate(contextPath, servletPath, pathInfo));

        // Close the capturing closure
        if (remap)
        {
            mod.addContent("\n");
            mod.addContent("})(" + mod.expandModulePath(dojoDwrBaseModulePath) + ");\n");
        }

        return mod.toString();
    }

    /**
     * Setter for the module path that dwr.engine is on
     * @param modulePath the modulePath to set
     */
    public void setDojoDwrBaseModulePath(final String modulePath)
    {
        dojoDwrBaseModulePath = modulePath;
    }

    /**
     * What module path is dwr.engine on?
     */
    protected String dojoDwrBaseModulePath;
}