Spring (2004 onward) offered similar services (transactions, DI, AOP) without requiring a full Java EE server. However, EJB 3.x narrowed the gap. Many new projects prefer Spring Boot, but EJB remains valid in Jakarta EE environments. 5. Integrating Servlets, JSP, and EJB – A Complete Architecture A typical Java EE web application (pre‑microservices) follows this layered architecture:
@WebServlet("/hello") public class HelloServlet extends HttpServlet protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException resp.setContentType("text/html"); PrintWriter out = resp.getWriter(); out.println("<h1>Hello from Servlet</h1>"); java for the web with servlets jsp and ejb pdf
A servlet can then inject and call this EJB: HttpServletResponse resp) throws ServletException