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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.util.Date;

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.extend.ProtocolConstants;
import org.joda.time.DateTime;
import org.joda.time.LocalDateTime;

public class LocalDateTimeConverter extends AbstractConverter {


    public Object convertInbound(Class paramType, InboundVariable data) throws ConversionException {
        if (data.isNull()) {
            return null;
        }

        String value = data.getValue();

        // If the text is null then the whole bean is null
        if (value.trim().equals(ProtocolConstants.INBOUND_NULL)) {
            return null;
        }

        try {
            long millis = 0;
            if (value.length() > 0) {
                millis = Long.parseLong(value);
            }

            if (paramType == DateTime.class) {
                return new DateTime(millis);
            } else if (paramType == LocalDateTime.class) {
                return new LocalDateTime(new Date(millis));
            } else {
                throw new ConversionException(paramType);
            }
        }
        catch (ConversionException ex) {
            throw ex;
        }
        catch (Exception ex) {
            throw new ConversionException(paramType, ex);
        }
    }

    public OutboundVariable convertOutbound(Object data, OutboundContext outboundContext) throws ConversionException {
        long milliSeconds;

        if (data instanceof DateTime) {
            DateTime dateTime = (DateTime) data;
            milliSeconds = dateTime.getMillis();
        } else if (data instanceof LocalDateTime) {
            LocalDateTime date = (LocalDateTime) data;
            milliSeconds = date.toDateTime().toDate().getTime();
        } else {
            throw new ConversionException(data.getClass());
        }
        return new NonNestedOutboundVariable("new Date(" + milliSeconds + ")");
    }
}