Answer / sreekumar

ServletContextListener is an interface which contains two
methods to be implemented namely contextInitialized and
contextDestroyed which will be called when context is
initialized and destroyed respectively. Both the methods
accepts ServletContextEvent as argument

PageContext is an implicit object which encapsulates other
implicit objects. ie. using pagecontext reference we can get
references to all other implicit objects and attributes from
all scopes

JspContext serves as the base class for the PageContext class

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