Servlets and JSP are both Java web technologies for generating dynamic content, but they differ fundamentally in their orientation: Servlets are Java-centric (HTML embedded in Java code), while JSP is content-centric (Java embedded in HTML). The choice affects development team composition, maintenance, and separation of concerns.
The tradeoff is between control (Servlets give full programmatic access to HTTP request/response) vs separation (JSP enables non-Java designers to maintain the view layer). Both compile to the same underlying servlet, but the development experience and team skill requirements differ.
| Dimension | Servlets | JSP |
|---|---|---|
| Nature | Java class with embedded HTML | HTML page with embedded Java |
| Best for | Request processing, business logic, API endpoints | Presentation, dynamic UI, form display |
| Java expertise | Required | Minimal (EL/JSTL) |
| Designer-friendly | No | Yes |
| Compilation | Direct .class | JSP→Servlet→.class |
| Performance | No translation overhead | First-access translation delay |
| Session management | HttpSession API | session implicit object |
| Error handling | try-catch in Java code | Error pages via page directive |
| Modern use | REST controllers (Spring MVC/Boot) | Template engines (Thymeleaf, React) |
- Building REST APIs or web services (return JSON/XML, not HTML)
- Request processing and routing logic
- When the team is Java-heavy and output format is non-HTML
- When you need full control over HTTP response headers and status codes
- Generating dynamic HTML pages with complex layouts
- Teams with UI designers who don’t write Java
- Prototyping view-heavy applications quickly
- Legacy enterprise applications with JSP-based views
Servlets and JSP solve the same problem from opposite directions. In modern Spring applications, the distinction is largely moot: @RestController replaces servlets for APIs, and template engines (Thymeleaf, FreeMarker) replace JSP for views. The underlying lesson — separation of presentation from logic — is what matters, not the specific technology.
- Servlets — Java-centric web component, compiled directly
- JSP — HTML-centric web page, compiles to servlet
- DispatcherServlet — Spring’s front controller unifying request handling
- Spring Controller — Modern equivalent of Servlet for request handling
- Spring MVC — Modern web framework that subsumes both Servlet and JSP patterns