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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.hibernate;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

import net.sf.hibernate.Hibernate;

import org.directwebremoting.convert.BeanConverter;
import org.directwebremoting.extend.Converter;
import org.directwebremoting.extend.MarshallException;
import org.directwebremoting.extend.Property;

/**
 * BeanConverter that works with Hibernate to get BeanInfo.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class H2BeanConverter extends BeanConverter implements Converter
{
    /* (non-Javadoc)
     * @see org.directwebremoting.extend.NamedConverter#getPropertyMapFromObject(java.lang.Object, boolean, boolean)
     */
    @Override
    public Map getPropertyMapFromObject(Object example, boolean readRequired, boolean writeRequired) throws MarshallException
    {
        Class clazz = Hibernate.getClass(example);
        try
        {
            BeanInfo info = Introspector.getBeanInfo(clazz);

            Map properties = new HashMap();
            for (PropertyDescriptor descriptor : info.getPropertyDescriptors())
            {
                String name = descriptor.getName();

                // We don't marshall getClass()
                if ("class".equals(name))
                {
                    continue;
                }

                // Access rules mean we might not want to do this one
                if (!isAllowedByIncludeExcludeRules(name))
                {
                    continue;
                }

                if (readRequired && descriptor.getReadMethod() == null)
                {
                    continue;
                }

                if (writeRequired && descriptor.getWriteMethod() == null)
                {
                    continue;
                }

                properties.put(name, new H2PropertyDescriptorProperty(descriptor));
            }

            return properties;
        }
        catch (Exception ex)
        {
            throw new MarshallException(clazz, ex);
        }
    }

    /**
     * Cache the method if possible, using the classname and property name to
     * allow for similar named methods.
     * @param data The bean to introspect
     * @param property The property to get the accessor for
     * @return The getter method
     * @throws IntrospectionException
     */
    protected Method findGetter(Object data, String property) throws IntrospectionException
    {
        String key = data.getClass().getName() + ":" + property;

        Method method = methods.get(key);
        if (method == null)
        {
            PropertyDescriptor[] props = Introspector.getBeanInfo(data.getClass()).getPropertyDescriptors();
            for (PropertyDescriptor prop : props)
            {
                if (prop.getName().equalsIgnoreCase(property))
                {
                    method = prop.getReadMethod();
                }
            }

            methods.put(key, method);
        }

        return method;
    }

    /**
     * The cache of method lookups that we've already done
     */
    protected final Map methods = new HashMap();
}