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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 boiler plate code between the web browser and your Java code.

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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.directwebremoting.convert;

import org.directwebremoting.dwrp.SimpleOutboundVariable;
import org.directwebremoting.extend.Converter;
import org.directwebremoting.extend.InboundContext;
import org.directwebremoting.extend.InboundVariable;
import org.directwebremoting.extend.MarshallException;
import org.directwebremoting.extend.OutboundContext;
import org.directwebremoting.extend.OutboundVariable;
import org.directwebremoting.util.JavascriptUtil;
import org.directwebremoting.util.LocalUtil;
import org.directwebremoting.util.Messages;

/**
 * Converter for all primitive types
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class PrimitiveConverter extends BaseV20Converter implements Converter
{
    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertInbound(java.lang.Class, org.directwebremoting.InboundVariable, org.directwebremoting.InboundContext)
     */
    public Object convertInbound(Class paramType, InboundVariable iv, InboundContext inctx) throws MarshallException
    {
        String value = iv.getValue();
        value = LocalUtil.decode(value.trim());

        try
        {
            return LocalUtil.simpleConvert(value, paramType);
        }
        catch (NumberFormatException ex)
        {
            throw new MarshallException(paramType, Messages.getString("PrimitiveConverter.FormatError", value));
        }
        catch (IllegalArgumentException ex)
        {
            throw new MarshallException(paramType);
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.Converter#convertOutbound(java.lang.Object, org.directwebremoting.OutboundContext)
     */
    public OutboundVariable convertOutbound(Object object, OutboundContext outctx)
    {
        Class paramType = object.getClass();

        if (object.equals(Boolean.TRUE))
        {
            return new SimpleOutboundVariable("true", outctx, true);
        }
        else if (object.equals(Boolean.FALSE))
        {
            return new SimpleOutboundVariable("false", outctx, true);
        }
        else if (paramType == Character.class)
        {
            // Treat characters as strings
            return new SimpleOutboundVariable('\"' + JavascriptUtil.escapeJavaScript(object.toString()) + '\"', outctx, true);
        }
        else
        {
            // We just use the default toString for all numbers
            return new SimpleOutboundVariable(object.toString(), outctx, true);
        }
    }
}