Set the namespace for this web application context,
to be used for building a default context config location.
The root web application context does not have a namespace.
Set the ServletConfig for this web application context.
Only called for a WebApplicationContext that belongs to a specific Servlet.
See Also:ConfigurableWebApplicationContext.refresh()
Set the ServletContext for this web application context.
Does not cause an initialization of the context: refresh needs to be
called after the setting of all configuration properties.
See Also:ConfigurableWebApplicationContext.refresh()