Close Spring's web application context for the given servlet context. If the default {@link #loadParentContext(ServletContext)} implementation,which uses ContextSingletonBeanFactoryLocator, has loaded any shared parent context, release one reference to that shared parent context.
If overriding {@link #loadParentContext(ServletContext)}, you may have to override this method as well.
@param servletContext the ServletContext that the WebApplicationContext runs in