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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.impl;

/**
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ExportUtil
{
    /**
     * Is this class the System export as from the system dwr.xml?
     * @param scriptName The script name of the exported object
     * @return True if the scriptName represents the System export
     * @see org.directwebremoting.export.System
     */
    public static boolean isSystemClass(String scriptName)
    {
        return "__System".equals(scriptName);
    }

    /**
     * Is this class the System export as from the system dwr.xml?
     * @param scriptName The script name of the exported object
     * @param methodName ...
     * @return True if the scriptName represents the System export
     * @see org.directwebremoting.export.System
     */
    public static boolean isUnprotectedSystemMethod(String scriptName, String methodName)
    {
        return "__System".equals(scriptName) && "generateId".equals(methodName);
    }
}