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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.dwrp;

import java.util.List;

import org.directwebremoting.extend.OutboundContext;
import org.directwebremoting.extend.OutboundVariable;

/**
 * An OutboundVariable that creates data from Collections.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ArrayOutboundVariable extends AbstractOutboundVariable implements OutboundVariable
{
    /**
     * Setup
     * @param outboundContext A collection of objects already converted and the results
     */
    public ArrayOutboundVariable(OutboundContext outboundContext)
    {
        super(outboundContext);
    }

    /**
     * Generate an array declaration for a list of Outbound variables
     * @param aOvs The list of contents of this array
     */
    public void init(List aOvs)
    {
        this.ovs = aOvs;
        setChildren(ovs);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.dwrp.AbstractOutboundVariable#getNotInlineDefinition()
     */
    protected NotInlineDefinition getNotInlineDefinition()
    {
        StringBuffer buffer = new StringBuffer();

        for (int i = 0; i < ovs.size(); i++)
        {
            OutboundVariable nested = (OutboundVariable) ovs.get(i);
            String varName = getVariableName();

            if (nested != null)
            {
                buffer.append(varName);
                buffer.append('[');
                buffer.append(i);
                buffer.append("]=");
                buffer.append(nested.getAssignCode());
                buffer.append(';');
            }
        }
        buffer.append("\r\n");

        return new NotInlineDefinition("var " + getVariableName() + "=[];", buffer.toString());
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.dwrp.AbstractOutboundVariable#getInlineDefinition()
     */
    protected String getInlineDefinition()
    {
        StringBuffer buffer = new StringBuffer();

        buffer.append("[");

        boolean first = true;
        for (int i = 0; i < ovs.size(); i++)
        {
            OutboundVariable ov = (OutboundVariable) ovs.get(i);

            if (!first)
            {
                buffer.append(',');
            }

            buffer.append(ov.getAssignCode());

            first = false;
        }
        buffer.append("]");

        return buffer.toString();
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    public String toString()
    {
        return "Array:" + toStringDefinitionHint() + ":" + ovs;
    }

    /**
     * The contained variables
     */
    private List ovs;
}