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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.datasync;

/**
 * There are many ways to get a property from things, the most obvious would
 * be reflection or introspection or using {@link java.util.Map#get}. This
 * interface allows us to abstract the options.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public interface AttributeValueExtractor
{
    /**
     * Get an attribute/property from a bean.
     * @param bean The object to read an attribute/property from.
     * @param property The attribute/property to read.
     * @return The value of the returned object or null if it could not be
     * found.
     */
    public Object getValue(Object bean, String property);
}