Custom subclass of ChainServlet that also dispatches incoming requests to a configurable Command loaded from the specified Catalog .

In addition to the servlet init parameters supported by ChainServlet , this class supports the following additional parameters:

• org.apache.commons.chain.CATALOG - Name of the catalog from which to acquire commands to be executed. If not specified, the default catalog for this application will be used.
• org.apache.commons.chain.COMMAND - Name of the Command (looked up in our configured Catalog used to process all incoming servlet requests. If not specified, defaults to command.

Also, the org.apache.commons.chain.CONFIG_ATTR init parameter is also used to identify the Context attribute under which our configured Catalog will be made available to Command s processing our requests, in addition to its definition of the ServletContext attribute key under which the Catalog is available.