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Why is HttpServlet Serializable?

 
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Hi Friends,

Why is HttpServlet (or GenericServlet) Serializable?

Same for HttpSessionBindingEvent, HttpSessionEvent, ServletContextEvent, ServletContextAttributeEvent.

They seem to live forever in the container, never travel outside of it. I have not noticed they have to be persisted either. So why is the need for serialization?

I appreciate your opinions.
 
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I'm not sure, but I think it's to allow the container to persist their state and "suspend/resume" them according to their use, pooling, etc... I can't think of another reason.
 
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And clustering
 
Don't get me started about those stupid light bulbs.
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