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MVC is violated anytime the application control-flow and/or the model or view/presentation is coupled into the same components/objects. This is most often seen in J2EE Web applications when servlets are used to handle control flow (client requests), but they also are used to access databases and create the markup (HTML) for the responses.
When MVC is violated, tight-couplings within the source code prevent the system from being distributed or scaled easily. It also makes upgrades to the system much more difficult, because the system is not divided into easily replaceable modules.
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