@Stateless public class BookingService @PersistenceContext private EntityManager em; @TransactionAttribute(TransactionAttributeType.REQUIRED) public void bookTicket(String user, int seat) // Business logic – transaction auto-managed
@WebServlet("/book") public class BookingServlet extends HttpServlet @EJB private BookingService bookingService; protected void doPost(...) bookingService.bookTicket(user, seat); java for the web with servlets jsp and ejb pdf
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: 5. Integrating Servlets
A servlet can then inject and call this EJB: HttpServletResponse resp) throws ServletException
@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>");
