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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 boilerplate code between the web browser and your Java code. This version 4.0.2 works with Jakarta Servlet 4.0.2.

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package org.directwebremoting.extend;

import org.directwebremoting.ui.Callback;

/**
 * TODO: can we make this work without a factory?
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface CallbackHelper
{
    /**
     * Used by the many proxy classes to record a callback for later calling
     * @param  ...
     * @param callback The callback that acts on the type
     * @param type The type of the data that we are recording
     * @return A key under which the data is stored
     */
    public  String saveCallback(Callback callback, Class type);
}