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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.util;

import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;

import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.Log;

/**
 * Mock implementation of the RequestDispatcher interface.
 * @author Rod Johnson
 * @author Juergen Hoeller
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class FakeRequestDispatcher implements RequestDispatcher {
    /**
     * Create a new FakeRequestDispatcher for the given URL.
     * @param url the URL to dispatch to.
     */
    public FakeRequestDispatcher(String url)
    {
        this.url = url;
    }

    public void forward(ServletRequest request, ServletResponse response) {
        if (response.isCommitted()) {
            throw new IllegalStateException("Cannot perform forward - response is already committed");
        }

        if (!(response instanceof FakeHttpServletResponse)) {
            throw new IllegalArgumentException("FakeRequestDispatcher requires FakeHttpServletResponse");
        }

        ((FakeHttpServletResponse) response).setForwardedUrl(url);

        if (log.isDebugEnabled()) {
            log.debug("FakeRequestDispatcher: forwarding to URL [" + url + "]");
        }
    }

    public void include(ServletRequest request, ServletResponse response) {
        if (!(response instanceof FakeHttpServletResponse)) {
            throw new IllegalArgumentException("FakeRequestDispatcher requires FakeHttpServletResponse");
        }

        ((FakeHttpServletResponse) response).setIncludedUrl(url);

        if (log.isDebugEnabled()) {
            log.debug("FakeRequestDispatcher: including URL [" + url + "]");
        }
    }

    private final String url;

    /**
     * The log stream
     */
    private static final Log log = LogFactory.getLog(FakeRequestDispatcher.class);
}