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JSP model 2 architecture
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<p>JSP Model 2 is a complex <a href="/facts/Design_pattern_(computer_science)/mV7r4egw">design pattern</a> used in the design of <a href="/facts/Java_(programming_language)/9ScgFyAL">Java</a> <a href="/facts/Web_application/BLkF3BIN">Web applications</a> which separates the display of content from the logic used to obtain and manipulate the content. Since Model 2 drives a separation between logic and display, it is usually associated with the <a href="/facts/Model%25E2%2580%2593view%25E2%2580%2593controller/vRbMXjMm">model–view–controller</a> (MVC) paradigm. While the exact form of the MVC "Model" was never specified by the Model 2 design, a number of publications recommend a formalized layer to contain MVC Model code. The <a href="/facts/Java_BluePrints/zsnGN31S">Java BluePrints</a>, for example, originally recommended using <a href="/facts/EJB/3lpxQpDv">EJBs</a> to encapsulate the MVC Model. </p><p>In a Model 2 application, requests from the <a href="/facts/Client_(computing)/u0wlVsWI">client</a> <a href="/facts/Web_browser/2pfyymLs">browser</a> are passed to the <a href="/facts/Control_logic/N6kLRKM1">controller</a>. The controller performs any logic necessary to obtain the correct content for display. It then places the content in the request (commonly in the form of a <a href="/facts/JavaBean/C0HvUnQ5">JavaBean</a> or <a href="/facts/POJO/sTUnd6MN">POJO</a>) and decides which view it will pass the request to. The view then renders the content passed by the controller. </p><p>Model 2 is recommended for medium- and large-sized applications. </p>