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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;

import java.util.Collection;

/**
 * A very basic IoC container
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface Container
{
    /**
     * Get an instance of a bean of a given name (usually name=class name).
     * @param name The type to get an instance of
     * @return The object of the given type, or null if the object does not exist
     */
    Object getBean(String name);

    /**
     * Get a list of all the available beans.
     * Implementation of this method is optional so it is valid for this method
     * to return an empty collection, but to return Objects when queried
     * directly using {@link #getBean(String)}. This method should only be used
     * for debugging purposes.
     * @return A collection containing all the availble bean names.
     */
    Collection getBeanNames();
}