JSPS

JavaServer Pages (JSP) is a server-side view technology in the Java ecosystem that enables the creation of dynamic web pages. A JSP file mixes HTML with special JSP elements that can generate content at request time. While early JSP allowed inline Java code via scriptlets, modern practice emphasizes expressions, tag libraries, and model data passed from controllers.

Execution is handled by a web container. When a JSP is requested, the container translates it into a servlet, compiles it to bytecode, and loads it. Translation and compilation may occur on first access or after changes. The resulting servlet writes the response using the standard servlet API. JSP provides implicit objects such as request, response, session, application, pageContext, out, config, and page for use within pages.

JSP supports directives (such as page, include, and taglib), scripting elements (expressions and declarations), and standard actions (include, forward). It also integrates with tag libraries, most notably the JavaServer Pages Standard Tag Library (JSTL) and custom tags, which help separate presentation from business logic and reduce Java code inside pages.

Applications typically use JSP as the view component in MVC-style architectures, with controllers implemented as servlets or provided by frameworks such as Spring MVC. JSPs are deployed inside a web archive (WAR) on a servlet container such as Apache Tomcat, Jetty, or GlassFish. In modern development, alternative templating engines or front-end technologies are often used, but JSP remains in use for many legacy and enterprise projects.

Historically part of the Java EE platform, JSP continues to be supported in Jakarta EE and related stacks. Its effectiveness depends on maintaining a clear separation between presentation and logic and on selecting appropriate tooling and libraries.