check if the variable 'ID' used in the query Delete from Person p where ID = 39 is correct....
________________________________ From: java-ee-j2ee-programming-with-passion@googlegroups.com [mailto:java-ee-j2ee-programming-with-pass...@googlegroups.com] On Behalf Of Biljana Biljana Sent: Friday, May 15, 2009 4:45 PM To: J2EE Passion Group Subject: [java ee programming] Homework in lab 4203 This is my error message when I try to delete one user from person table: HTTP Status 500 - ________________________________ type Exception report message descriptionThe server encountered an internal error () that prevented it from fulfilling this request. exception javax.servlet.ServletException: java.lang.IllegalArgumentException: An exception occured while creating a query in EntityManager root cause java.lang.IllegalArgumentException: An exception occured while creating a query in EntityManager root cause Exception [TOPLINK-8004] (Oracle TopLink Essentials - 2.1 (Build b60e-fcs (12/23/2008))): oracle.toplink.essentials.exceptions.EJBQLException Exception Description: Error compiling the query [Delete from Person p where ID = 39], line 1, column 29: unknown identification variable [id]. The FROM clause of the query does not declare an identification variable [id]. note The full stack traces of the exception and its root causes are available in the Sun GlassFish Enterprise Server v2.1 logs. ________________________________ Sun GlassFish Enterprise Server v2.1 My DeletePersonServlet which was called have this code: @PersistenceUnit //The emf corresponding to private EntityManagerFactory emf; @Resource private UserTransaction utx; protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { assert emf != null; //Make sure injection went through correctly. EntityManager em = null; try { //Get the data from user's form HttpSession session = request.getSession(); String id = (String) session.getAttribute("id"); String firstName = (String) session.getAttribute("firstName"); String lastName = (String) session.getAttribute("lastName"); //Create a person instance out of it Person person = new Person(id, firstName, lastName); //begin a transaction utx.begin(); //create an em. //Since the em is created inside a transaction, it is associsated with //the transaction em = emf.createEntityManager(); //delete the person entity Query squery = em.createQuery("Delete from Person p where ID = " + id); //squery.setParameter(1, id); squery.executeUpdate(); //commit transaction which will trigger the em to //commit newly created entity into database utx.commit(); //Forward to ListPerson servlet to list persons along with the newly //created person above request.getRequestDispatcher("ListPerson").forward(request, response); } catch (Exception ex) { throw new ServletException(ex); } finally { //close the em to release any resources held up by the persistebce provider if(em != null) { em.close(); } } } I notice that it took id from last one created person, not from one I want, I set attribute with: <c:set value="id" scope="session" var="${person.id}"/> But I just dont know how to set right id like is done for <h:commandLink...> <f:param.../> </h:commandLink> because this --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Java EE (J2EE) Programming with Passion!" group. To post to this group, send email to java-ee-j2ee-programming-with-passion@googlegroups.com To unsubscribe from this group, send email to java-ee-j2ee-programming-with-passion+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/java-ee-j2ee-programming-with-passion?hl=en -~----------~----~----~----~------~----~------~--~---
