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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.extend;

/**
 * An OutboundVariable that declares a JavaScript array
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ArrayOutboundVariable extends NestedOutboundVariable
{
    /**
     * Constructor
     */
    public ArrayOutboundVariable(OutboundContext context)
    {
        super(context);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.OutboundVariable#getDeclareCode()
     */
    public String getDeclareCode()
    {
        if (isInline())
        {
            return getChildDeclareCodes();
        }
        else
        {
            return getChildDeclareCodes() + "var " + getVariableName() + "=[];";
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.OutboundVariable#getBuildCode()
     */
    public String getBuildCode()
    {
        if (isInline())
        {
            return getChildBuildCodes();
        }
        else
        {
            StringBuffer buffer = new StringBuffer(getChildBuildCodes());

            int i = 0;
            String variableName = getVariableName();
            for (OutboundVariable child : getChildren())
            {
                if (child != null)
                {
                    buffer.append(variableName);
                    buffer.append('[');
                    buffer.append(i);
                    buffer.append("]=");
                    buffer.append(child.getAssignCode());
                    buffer.append(';');
                }

                i++;
            }
            buffer.append("\r\n");

            return buffer.toString();
        }
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.extend.OutboundVariable#getAssignCode()
     */
    public String getAssignCode()
    {
        if (isInline())
        {
            StringBuffer buffer = new StringBuffer();

            buffer.append("[");

            boolean first = true;
            for (OutboundVariable child : getChildren())
            {
                if (!first)
                {
                    buffer.append(',');
                }

                buffer.append(child.getAssignCode());

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

            return buffer.toString();
        }
        else
        {
            return getVariableName();
        }
    }
}