0 Replies Latest reply on Jun 4, 2013 7:52 AM by ha so

    Cant inject Bean class into Restfull WebService (JAX-RS)

    ha so Newbie

      I'm trying to save data acquired by Rest web service to database using hibernate/persistence.

      In one of my web modules i implemented that service. Database ejb connector is placed in EJB module. They are parts of EAR application.

      Every time when i call pb.addDevice() im getting  java.lang.NullPointerException when puting proper url with params in browser(worked till i wanted to save it to Database). Can't find what is wrong with it. I'm using jboss 6.1.0 Final.


      PS. when i changed from



          PersistenceBean pb;



          PersistenceBean pb = new PersistenceBean();


      i got null pointer on  EntityManager em = emf.createEntityManager();







          public class RestPush  {



          PersistenceBean pb;




              public void registerDevice(

                  @QueryParam("deviceId") String deviceId){


                  Device d = new Device(true);

                  d.setId = deviceId;






      and EJB class:


          @Stateless(mappedName = "PersistenceBean")

          public class PersistenceBean {

          @PersistenceUnit(unitName = "PersistentUnitName")

          EntityManagerFactory emf;


          private void persist(Object o, EntityManager entityManager) {

              try {


              } catch (Exception e) {

                  logger.severe("Error writing to DB: " + e);

                  logger.severe("" + e.fillInStackTrace());



            public void addDevice(Device d) {

              try {

                  EntityManager em = emf.createEntityManager();

              if (persist(device, em)) {

                      logger.info("Device with id : " + device.getId()

                              + " has been added ");

          } else {

                      logger.info("Failed to add device with id: " + device.getId());

          } catch (Exception e) {

                  logger.severe("PersistenceBean: Could not save device.");