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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;

/**
 * An interface to the various methods of compressing web resources.
 * This primarily means JavaScript, but could in theory extend to other
 * resources like CSS, HTML, etc.
 * @author David Marginian [david at butterdev dot com]
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface Compressor
{
    /**
     * Compress a JavaScript file to a smaller version of the original
     * @param script The script to compress
     * @return The compressed script
     * @throws Exception The implementations of this interface are all likely to
     * have different things they can throw. We are going to catch Exception
     * anyway because we can continue (by using uncompressed scripts) so why
     * force implementors to nest to another exception type when we can just let
     * them use the original exception?
     */
    public String compressJavaScript(String script) throws Exception;
}