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Since Servlet 3.0 asynchronous processing is supported. Would it be better, to use always asynchronous processing? Or in what cases is synchronous processing better?
The big thing you get with asynchronous servlets is HTTP push, where the server can fire information back to the client when it chooses to, rather than when the client asks for it. Pre-asynch servlets, this would require long-running HTTP connections which each tied up a server thread, which is very inefficient. This new model decouples the server-side processing from the connection handling.