Editing Jakarta Server Pages (section)

==Overview==
[[File:JSP Model 2.svg|thumb|The JSP Model 2 architecture.]]

Architecturally, JSP may be viewed as a high-level [[Abstraction (computer science)|abstraction]] of [[Jakarta Servlet]]s. JSPs are translated into servlets at runtime, therefore JSP is a Servlet; each JSP servlet is cached and re-used until the original JSP is modified.<ref>[http://java.sun.com/j2ee/tutorial/1_3-fcs/doc/JSPIntro4.html The Life Cycle of a JSP Page (Sun documentation)]</ref>

Jakarta Server Pages can be used independently or as the view component of a server-side [[model–view–controller]] design, normally with [[JavaBeans]] as the model and Java servlets (or a framework such as [[Apache Struts]]) as the controller. This is a type of [[JSP model 2 architecture|Model 2]] architecture.<ref>{{cite web |last1=Seshadri |first1=Govind |date=1999-12-29 |df=mdy |url=https://www.infoworld.com/article/2076557/understanding-javaserver-pages-model-2-architecture.html |title=Understanding JavaServer Pages Model 2 architecture |work=[[JavaWorld]] |access-date=2020-07-17}}</ref>

JSP allows Java code and certain predefined actions to be interleaved with static web markup content, such as HTML. The resulting page is compiled and executed on the server to deliver a document. The compiled pages, as well as any dependent Java libraries, contain Java bytecode rather than [[machine code]]. Like any other .jar or Java program, code must be executed within a [[Java virtual machine]] (JVM) that interacts with the server's host [[operating system]] to provide an abstract, platform-neutral environment.

JSPs are usually used to deliver HTML and XML documents, but through the use of OutputStream, they can deliver other types of data as well.<ref>{{Cite web|url=https://coderanch.com/t/286297/JSP/java/OutputStream-already-obtained|title=OutputStream already obtained (JSP forum at Coderanch)|website=coderanch.com}}</ref>

The [[Web container]] creates JSP implicit objects like request, response, session, application, config, page, pageContext, out and exception. JSP Engine creates these objects during translation phase.