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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 AMD format.
 * @author Mike Wilson
 */
public class AmdEngineHandler 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
    {
        AmdModule mod = new AmdModule(contextPath, servletPath);

        // Local variable to capture the DWR namespace
        mod.addContent("var dwr;\n");

        // Local variable to capture dwrConfig
        mod.addDependency("", "module", "module"); // Use pseudo module in AMD to access configuration
        mod.addContent("var dwrConfig = module && module.config && module.config();\n");

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

        // Alias allowing dwr.* or dwr.engine.* to be used
        mod.addContent("dwr.engine.engine = dwr.engine;\n");

        mod.addContent("return dwr.engine;\n");

        return mod.toString();
    }
}