0 Replies Latest reply on Oct 9, 2014 10:44 AM by xavier flamant

    problem with a stateless session bean

    xavier flamant Newbie

      Hello,

       

      I don't know if it is the right forum for this discussion. I didn't find the answer elsewhere. Anyway, here is my problem

       

      I have a java client (Main program) that call a remote SLSB by a lookup

       

      [CODE]

                  int choice = 1;

                  String viewClassName = LibrarySessionBeanRemote.class.getName();

                  LibrarySessionBeanRemote libraryBean = (LibrarySessionBeanRemote) ctx.lookup("EJBTutorial/EJBTutorialEJB//LibrarySessionBean!"+ viewClassName);

                  while (choice != 2) {

                      String bookName;

                      showGUI();

                      String strChoice = brConsoleReader.readLine();

                      choice = Integer.parseInt(strChoice);

                      if (choice == 1) {

                          System.out.print("Enter book name: ");

                          bookName = brConsoleReader.readLine();

                          libraryBean.addBook(bookName);

                      } else if (choice == 2) {

                          break;

                      }

                  }

                  List<String> booksList = libraryBean.getBooks();

                  System.out.println("Book(s) entered so far: " + booksList.size());

                  for (int i = 0; i < booksList.size(); ++i) {

                      System.out.println((i + 1) + ". " + booksList.get(i));

                  }

      [/CODE]

       

      Before doing my lookup, I run a dozen threads that call a servlet. Each servlet contains an instance of my SLSB

       

      [CODE]

      @WebServlet(name="ServletCallSessionBean", urlPatterns={"/test"})

      public class ServletCallSessionBean extends HttpServlet {

       

          @EJB(beanName = "LibrarySessionBean")

          private LibrarySessionBeanLocal monBean;

       

          protected void processRequest(HttpServletRequest request, HttpServletResponse response)

                  throws ServletException, IOException {

              response.setContentType("text/html;charset=UTF-8");

              //PrintWriter out = response.getWriter();

              monBean.getBooks();

              System.out.println("DEBUT ATTENTE");

              try {

                  Thread.sleep(300000);

              } catch (InterruptedException e) {

                  // TODO Auto-generated catch block

                  e.printStackTrace();

              }

              System.out.println("FIN ATTENTE");

              PrintWriter out = new PrintWriter (response.getOutputStream());

              try {

                  out.println("<html>");

                  out.println("<head>");

                  out.println("<title>Servlet MaServlet</title>");

                  out.println("</head>");

                  out.println("<body>");

                  out.println("</body>");

                  out.println("</html>");

              } finally {

                  out.close();

              }

       

          }

       

          @Override

          protected void doGet(HttpServletRequest request, HttpServletResponse response)

                  throws ServletException, IOException {

              processRequest(request, response);

          }

       

          @Override

          protected void doPost(HttpServletRequest request, HttpServletResponse response)

                  throws ServletException, IOException {

              processRequest(request, response);

       

          }

       

          @Override

          public String getServletInfo() {

              return "Ma servlet de test";

          }

       

       

      }

      [/CODE]

       

      This SLSB has an attribut List<String> bookShelf.

       

      [CODE]

      @Stateless(name = "LibrarySessionBean")

      @Local(LibrarySessionBeanLocal.class)

      @Remote(LibrarySessionBeanRemote.class)

      @LocalBean

      public class LibrarySessionBean {

       

          private List<String> bookShelf;

       

          /**

           * Default constructor.

           */

          public LibrarySessionBean() {

              // TODO Auto-generated constructor stub

              System.out.println("object this.toString=" + this.toString());

              System.out.println("constructeur LibrarySessionBean  appele");

              bookShelf = new ArrayList<String>();

          }

       

       

          public void addBook(String bookname) {

              System.out.println("object this.toString=" + this.toString());

              System.out.println("addbook appele");

              bookShelf.add(bookname);

          }

       

       

          public List<String> getBooks() {

              System.out.println("object this.toString=" + this.toString());

              System.out.println("getBooks appele");

              return bookShelf;

          }

       

      }

      [/CODE]

       

      When I add a book from the client side in the Main program(see the red part of the code) and when I inspect (debugging) my List the book isn't in it

       

      I know that it is a SLSB (without state), but immediately after adding a book, the book should be in the List. When I don't run the dozen threads before, the book is in the List

       

      Do you have an idea ? Thanks in advance for your answers.