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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;

/**
 * A set of constants that represent how browsers need data flushed to them
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class PartialResponse
{
    /**
     * The client can not handle partial responses
     */
    public static final int NO = 0;

    /**
     * The client can handle partial responses
     */
    public static final int YES = 1;

    /**
     * The client can only handle partial responses with a 4k data post
     * (can be whitespace) - we're talking IE here.
     */
    public static final int FLUSH = 2;

    /**
     * Convert a string from the web into a PartialResponse. The values are
     * PARTIAL_RESPONSE_NO = "0", PARTIAL_RESPONSE_YES = "1" and
     * PARTIAL_RESPONSE_FLUSH = "2"
     * @param id The PartialResponse to look-up
     * @return a matching PartialResponse or null if one was not found
     */
    public static int fromOrdinal(String id)
    {
        return Integer.parseInt(id);
    }
}