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Cant inject Bean class into Restfull WebService (JAX-RS)
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created by <a href="https://community.jboss.org/people/haso">ha so</a> in <i>EJB3</i> - <a href="https://community.jboss.org/message/821240#821240">View the full discussion</a>
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<div class="jive-rendered-content"><p>I'm trying to save data acquired by Rest web service to database using hibernate/persistence.</p><p>In one of my web modules i implemented that service. Database ejb connector is placed in EJB module. They are parts of EAR application.</p><p>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.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>PS. when i changed from </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @EJB</p><p>    PersistenceBean pb; </p><p>to</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    PersistenceBean pb = new PersistenceBean();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>i got null pointer on  EntityManager em = emf.createEntityManager(); </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>code:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @Stateless</p><p>    @Path("/RestService")</p><p>    public class RestPush  {</p><p>    </p><p>    @EJB</p><p>    PersistenceBean pb; </p><p>    </p><p>        @GET</p><p>          @Path("/RegisterDevice")</p><p>        public void registerDevice(</p><p>            @QueryParam("deviceId") String deviceId){</p><p>                      </p><p>            Device d = new Device(true);</p><p>            d.setId = deviceId;</p><p>            pb.addDevice(d);</p><p>        }</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>and EJB class:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    @Stateless(mappedName = "PersistenceBean")</p><p>    public class PersistenceBean {</p><p>    @PersistenceUnit(unitName = "PersistentUnitName")</p><p>    EntityManagerFactory emf;</p><p>    </p><p>    private void persist(Object o, EntityManager entityManager) {</p><p>        try {</p><p>            entityManager.persist(o);</p><p>        } catch (Exception e) {</p><p>            logger.severe("Error writing to DB: " + e);</p><p>            logger.severe("" + e.fillInStackTrace());</p><p>        }</p><p>    }</p><p>      public void addDevice(Device d) {</p><p>        try {</p><p>            EntityManager em = emf.createEntityManager(); </p><p>        if (persist(device, em)) {</p><p>                logger.info("Device with id : " + device.getId()</p><p>                        + " has been added ");</p><p>    } else {</p><p>                logger.info("Failed to add device with id: " + device.getId());</p><p>    } catch (Exception e) {</p><p>            logger.severe("PersistenceBean: Could not save device.");</p><p>            e.printStackTrace();</p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    }</p></div>
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