Implementations of javax.servlet.ServletContextListener are
invoked at their contextInitialized method in the order in which they
have been declared, and at their contextDestroyed method in reverse order.

Implementations of javax.servlet.ServletRequestListener are
invoked at their requestInitialized method in the order in which they
have been declared, and at their requestDestroyed method in reverse order.

Implementations of javax.servlet.http.HttpSessionListener are
invoked at their sessionCreated method in the order in which they have
been declared, and at their sessionDestroyed method in reverse order.