Name
Magic Servlet
Mistake
A single servlet performs duties of model, view, and controller, making the servlet large and difficult to maintain.
Watch for It When
Servlets are large and complicated, servlets output HTML directly, or servlets are directly connected to databases or other external resources.
Solution
Refactor into the MVC architecture. Separate all output generation into JSP pages or separate servlets. Separate calls to business data into reusable actions. Coordinate input processing, actions, and views with servlets.
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