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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 java.net.MalformedURLException;
import java.net.URL;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.ConversionException;
import org.directwebremoting.extend.AbstractConverter;
import org.directwebremoting.extend.InboundVariable;
import org.directwebremoting.extend.NonNestedOutboundVariable;
import org.directwebremoting.extend.OutboundContext;
import org.directwebremoting.extend.OutboundVariable;
import org.directwebremoting.util.JavascriptUtil;

/**
 * An implementation of Converter for Strings.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class URLConverter extends AbstractConverter
{
    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertInbound(java.lang.Class, org.directwebremoting.InboundVariable, org.directwebremoting.InboundContext)
     */
    public Object convertInbound(Class paramType, InboundVariable data) throws ConversionException
    {
        if (data.isNull())
        {
            return null;
        }

        String urlString = data.urlDecode();
        try
        {
            return new URL(urlString);
        }
        catch (MalformedURLException ex)
        {
            log.warn("Failed to create URL from string '" + urlString + "'. Returning null");
            return null;
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertOutbound(java.lang.Object, org.directwebremoting.OutboundContext)
     */
    public OutboundVariable convertOutbound(Object data, OutboundContext outctx) throws ConversionException
    {
        URL url = (URL) data;
        String escaped = JavascriptUtil.escapeJavaScript(url.toExternalForm());
        return new NonNestedOutboundVariable('\"' + escaped + '\"');
    }

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