Mamadou Touré

Hi Folks,

I want to buy a new laptop windows 7 a core i7 quade core for ROR development, but I'm wondering if the 64bits is not incompatible with ROR ?? Will I have trouble with that ?

Regards

Thanks Paolo for these clarifications

I don't say that JEE needs EJBs to be robust, but the EJB containers can help a lot by providing automatically the ''ilities'', so the the developper can just concentrate on the business code

Hi Folks,

I'm a new on RoR, I'm just wondering is Ruby has an equivalent of EJBs to build robust business application ?

Welcome Paolo Perrotta

I hope I will be the lucky winner. I've just started to learn ruby (I'm a RoRholic)

I use TopLink. Now I don't even see the records that I have in others tables. It seems that my SELECT * FROM ..... doesn't work anymore, it returns nothing.

Hi,

I wrote en EJB that is called by a servlet, but when it comes to persiting the data, the operation is executed without error, but table is still empty (I don't see the record that has been persisted). I use TopLink as persistence tool. So could someone tell me what's wrong


here is my code
/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package com.flight.ejb; import com.flight.transferObject.PassengerTO; import javax.ejb.Stateless; import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; /** * * @author mtoure */ @Stateless public class SessionPassengerBean implements SessionPassengerLocal { @PersistenceContext(unitName="flight" ) private EntityManager em; public void addPassenger(PassengerTO pTO) { Passenger pass = new Passenger(); pass.setPaddress(pTO.getPAddress()); pass.setPcode(pTO.getPCode()); pass.setPemail(pTO.getPEmail()); pass.setPfname(pTO.getPFname()); pass.setPfreqfly(pTO.getPFreqFly()); pass.setPlname(pTO.getPLname()); em.persist(pass); em.flush(); } // Add business logic below. (Right-click in editor and choose // "Insert Code > Add Business Method" or "Web Service > Add Operation") }

Hi Folks,

I'm trying to call a simple EJB3 from a servlet using the DI, I'm using glassFish, but I got the following error

Caused by: java.lang.RuntimeException: Cannot resolve reference Unresolved Ejb-Ref com.mamadou.CallEjb/salut@jndi: @null@com.EJBmamadou.ejb.EJBName1Local@Session@null
at com.sun.enterprise.deployment.util.EjbBundleValidator.accept(EjbBundleValidator.java:430)
at com.sun.enterprise.deployment.WebBundleDescriptor.visit(WebBundleDescriptor.java:1415)
at com.sun.enterprise.deployment.archivist.WebArchivist.validate(WebArchivist.java:188)
at com.sun.enterprise.deployment.archivist.ApplicationArchivist.openArchive(ApplicationArchivist.java:840)
at com.sun.enterprise.deployment.archivist.ApplicationArchivist.openArchive(ApplicationArchivist.java:794)
at com.sun.enterprise.deployment.backend.Deployer.loadDescriptors(Deployer.java:365)
... 10 more


Here is my servlet code
/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package com.mamadou; import java.io.IOException; import com.EJBmamadou.ejb.*; import javax.ejb.EJB; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * * @author mtoure */ public class CallEjb extends HttpServlet { @EJB private EJBName1Local salut; // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** * Handles the HTTP <code>GET</code> method. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { } /** * Handles the HTTP <code>POST</code> method. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String greeting = request.getParameter("Greeting"); String greeting2 = salut.Hello(greeting); request.setAttribute("salutation", greeting2); RequestDispatcher view = request.getRequestDispatcher("SalutEjb.jsp"); view.forward(request, response); } /** * Returns a short description of the servlet. * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold> }

Here is my EJB implementation code code
/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package com.EJBmamadou.ejb; import javax.ejb.Stateless; /** * * @author mtoure */ @Stateless public class EJBName1Bean implements EJBName1Local { public String Hello(String name) { System.out.println("Hello" +name); throw new UnsupportedOperationException("Not supported yet."); } }

Here is my EJB interface code
/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package com.EJBmamadou.ejb; import javax.ejb.Local; /** * * @author mtoure */ @Local public interface EJBName1Local { public String Hello(String Name); }

Is there a book dedicated to prepare the SCEA 310-052 ?, or could I just setlle for the Sun Certified Enterprise Architect for Java EE Study Guide (Exam 310-051) by Paul Allen and Joseph Bambara to prepare the 310-052 ??

What a terrific score !!!

you guys are hardworkers

congratulation, so what's next ?

EJB3 in Action + the specs, you'll be ready and confident for the exam for sure

That means, you have to refer to the specs. There are 3 pdf documents for the spec that you should download

1 - ejb-3_0-fr-spec-ejbcore
2 - ejb-3_0-fr-spec-persistence
3 - ejb-3_0-fr-spec-simplified

Here is the site where you can download them
http://jcp.org/aboutJava/communityprocess/final/jsr220/index.html

Good luck

As I said, there are some important details for the exam that you won't find in EJB3 in Action (Don't forget that EJB3 in Action is not intended for the SCBCD exam preparation). You'll see for instance when you buy the enthuware kit, there are several explanations that refer to the spec. so don't neglect the spec although EJB3 is an excellent book when you need to understand EJB technology.

Hi,

Study all of them, if you don't wanna have a bad surprise. They're a must

Hello Vasanthi hiremath

It took me almost 5 months, but I should say that I was not studying regularly, I started to study seriously 1 month before the exam.

I bought enthuware online on their site

Regards