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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.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.directwebremoting.ConversionException;

/**
 * A Property for when we've been given override information in a signatures
 * element.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class OverrideProperty implements Property
{
    /**
     * All OverrideProperties need a name and the type they are providing
     * @param propertyType ...
     */
    public OverrideProperty(Class propertyType)
    {
        this.propertyType = propertyType;
    }

    public Property createChild(int index)
    {
        return new NestedProperty(this, null, null, 0, index);
    }

    public String getName()
    {
        return "OverrideProperty";
    }

    public Class getPropertyType()
    {
        return propertyType;
    }

    public Object getValue(Object bean) throws ConversionException
    {
        log.error("Attempt to getValue() on Override Property.");
        return null;
    }

    public void setValue(Object bean, Object value) throws ConversionException
    {
        log.error("Attempt to setValue() on Override Property.");
    }

    /**
     * @see org.directwebremoting.extend.Property#getName()
     */
    private final Class propertyType;

    /**
     * The log stream
     */
    private static final Log log = LogFactory.getLog(OverrideProperty.class);
}