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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.dwrp;

import java.io.PrintWriter;

import org.directwebremoting.extend.ScriptConduit;

/**
 * A ScriptConduit that works with the parent Marshaller.
 * In some ways this is nasty because it has access to essentially private parts
 * of BasePollHandler, however there is nowhere sensible to store them
 * within that class, so this is a hacky simplification.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public abstract class BaseScriptConduit implements ScriptConduit
{
    /**
     * Simple constructor
     * @param out ...
     * @param instanceId ...
     */
    public BaseScriptConduit(PrintWriter out, String instanceId)
    {
        this.out = out;
        this.instanceId = instanceId;
    }

    /**
     * When and what should we log? Options are (specified in the DWR servlet's init-params):
     * 1) call (start of call + successful return values).
     * 2) exception (checked) - default for debug.
     * 3) runtimeexception (unchecked).
     * 4) error - default for production.
     * 5) off.
     * @param accessLogLevel ...
     */
    public void setAccessLogLevel(String accessLogLevel)
    {
        this.accessLogLevel = accessLogLevel;
    }

    /**
     * Do we debug all the scripts that we output?
     * @param debugScriptOutput true to debug all of the output scripts (verbose)
     */
    public void setDebugScriptOutput(boolean debugScriptOutput)
    {
        this.debugScriptOutput = debugScriptOutput;
    }

    /**
     * Do we debug all the scripts that we output?
     */
    protected boolean debugScriptOutput = false;

    /**
     * When and what should we log? Options are (specified in the DWR servlet's init-params):
     * 1) call (start of call + successful return values).
     * 2) exception (checked) - default for debug.
     * 3) runtimeexception (unchecked).
     * 4) error - default for production.
     * 5) off.
     */
    protected String accessLogLevel = null;

    /**
     * The response output stream
     */
    protected final PrintWriter out;

    /**
     * What is the ID of the DWR instance that we are responding to?
     */
    protected final String instanceId;
}