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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.extend;

import org.directwebremoting.WebContextFactory;
import org.directwebremoting.util.LocalUtil;

/**
 * An OutboundVariable that can not be recursive.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ErrorOutboundVariable extends NonNestedOutboundVariable
{
    /**
     * Default ctor that leaves blank members
     * @param errorMessage Some message for the developer to see.
     */
    public ErrorOutboundVariable(String errorMessage)
    {
        super(sanitizeErrorMessage(errorMessage));
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.OutboundVariable#getAssignCode()
     */
    public static String sanitizeErrorMessage(String errorMessage)
    {
        boolean debug = false;

        Object debugVal = WebContextFactory.get().getContainer().getBean("debug");
        if (debugVal != null)
        {
            debug = LocalUtil.simpleConvert(debugVal.toString(), Boolean.class);
        }

        if (debug)
        {
            return "null /* " + errorMessage.replace("*/", "* /") + " */";
        }
        else
        {
            return "null";
        }
    }
}