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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 DTO class generation requests compatible with the AMD module format.
 * @author Mike Wilson [mikewse at hotmail dot com]
 */
public class AmdDtoHandler extends BaseDtoHandler
{
    /* (non-Javadoc)
     * @see org.directwebremoting.servlet.BaseDtoHandler#getBaseDtoPath()
     */
    @Override
    protected String getBaseDtoPath()
    {
        return amdDtoHandlerUrl;
    }

    /* (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)
        {
            NamedConverter namedConv = converterManager.getNamedConverter(jsClassName);
            String jsSuperClassName = namedConv.getJavascriptSuperClass();

            AmdModule mod = new AmdModule(contextPath, servletPath);
            mod.addDependency(amdDwrBaseModulePath, "engine", "dwr");
            if (LocalUtil.hasLength(jsSuperClassName))
            {
                mod.addDependency(amdDtoBaseModulePath, jsSuperClassName, "parent");
            }

            mod.addContent("  var c;\n");
            mod.addContent("\n");

            // Generate DTO
            mod.addContent(dtojs);
            mod.addContent("    dwr.engine._mappedClasses[\"" + jsClassName + "\"] = c;\n");

            // Generate inheritance
            if (LocalUtil.hasLength(jsSuperClassName))
            {
                String classExpression = "dwr.engine._mappedClasses[\"" + jsClassName + "\"]";
                mod.addContent(remoter.generateDtoInheritanceJavaScript("    ", classExpression, "parent", "dwr.engine._delegate"));
            }

            mod.addContent("\n");
            mod.addContent("  return c;\n");

            script = mod.toString();
        }

        return script;
    }

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

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

    /**
     * Setter for the module path that DTO is on
     * @param modulePath the modulePath to set
     */
    public void setAmdDtoBaseModulePath(final String modulePath)
    {
        amdDtoBaseModulePath = modulePath;
    }

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

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

    /**
     * What module path are DTOs on?
     */
    protected String amdDtoBaseModulePath;
}