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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.convert;

import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletContext;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import jakarta.servlet.http.HttpSession;

import org.directwebremoting.WebContext;
import org.directwebremoting.WebContextFactory;
import org.directwebremoting.extend.AbstractConverter;
import org.directwebremoting.extend.Converter;
import org.directwebremoting.extend.InboundVariable;
import org.directwebremoting.extend.NonNestedOutboundVariable;
import org.directwebremoting.extend.OutboundContext;
import org.directwebremoting.extend.OutboundVariable;

/**
 * A converter that magics up HTTP objects
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ServletConverter extends AbstractConverter implements Converter {

    public Object convertInbound(Class paramType, InboundVariable data) {
        WebContext webcx = WebContextFactory.get();

        if (HttpServletRequest.class.isAssignableFrom(paramType)) {
            return webcx.getHttpServletRequest();
        }

        if (HttpServletResponse.class.isAssignableFrom(paramType)) {
            return webcx.getHttpServletResponse();
        }

        if (ServletConfig.class.isAssignableFrom(paramType)) {
            return webcx.getServletConfig();
        }

        if (ServletContext.class.isAssignableFrom(paramType)) {
            return webcx.getServletContext();
        }

        if (HttpSession.class.isAssignableFrom(paramType)) {
            return webcx.getSession(true);
        }

        return null;
    }

    public OutboundVariable convertOutbound(Object data, OutboundContext outctx) {
        return new NonNestedOutboundVariable("null");
    }
}