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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.impl;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.ScriptSession;
import org.directwebremoting.ScriptSessionFilter;
import org.directwebremoting.extend.ScriptSessionManager;
import org.directwebremoting.extend.TaskDispatcher;

/**
 * Default single node implementation of TaskDispatcher
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DefaultTaskDispatcher implements TaskDispatcher
{

    public void dispatchTask(ScriptSessionFilter filter, Runnable task)
    {
        Collection all = scriptSessionManager.getAllScriptSessions();
        Collection use = new ArrayList();

        for (ScriptSession session : all)
        {
            if (filter.match(session))
            {
                use.add(session);
            }
        }

        if (use.size() > 0)
        {
            if (log.isDebugEnabled()) {
        	    log.debug("Execution time: " + new Date().toString() + " - Executing task (" + task.getClass().getSimpleName() + ") against " + use.size() + " sessions.");
            }
            target.set(use);
            task.run();
            target.remove();
        }
    }

    public Collection getTargetSessions()
    {
        return target.get();
    }

    /**
     * Connection to the DwrServlet that we are attached to
     * @param scriptSessionManager ...
     */
    public void setScriptSessionManager(ScriptSessionManager scriptSessionManager)
    {
        this.scriptSessionManager = scriptSessionManager;
    }

    /**
     * @see #setScriptSessionManager(ScriptSessionManager)
     */
    private ScriptSessionManager scriptSessionManager;

    /**
     * ThreadLocal in which the list of sessions are stored.
     */
    private final ThreadLocal> target = new ThreadLocal>();

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