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Question:
Web applications usually need some initialization procedures that must be performed once and only once. Select best approaches related to web initialization procedures

Pass initialization parameters for a web application via the web.xml file.

Pass initialization parameters for a web application in a single Java source that extends java.util.Properties class.
Read initialization parameters using methods of the Hashtable, Properties, and your extended class.

Read initialization parameters using

Provide initialization procedures for a web application in the contextInitialized() method of
your implementation of the ServletContextListener interface.
Read initialization parameters using getServletContext().getInitParameter() methods.

Provide initialization procedures for a web application in a Struts login action.

Provide initialization procedures for a web application in the service() method of the first servlet invoked by the application.

Pass initialization parameters for a web application via one or more configuration files with the .conf extension.
Read initialization parameters by parsing configuration files with regular expressions methods.

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