title: javax.persistence.PersistenceException: org.hibernate.id.IdentifierGenerationException:
body: <p>How to pass and set the ID in <code>BetRecordAgEBR</code>? Please Help me:) Thanks in advance. This is my only problem that encounter. The <code>BetRecordAgEBR</code> class is for may database using <code>jpa</code>.</p>
  
  <pre><code>if ("GR".equals(dataType)) {
      ByteArrayInputStream bis = new ByteArrayInputStream(
                                      aw.getBytes());
      StreamSource ss = new StreamSource(bis);
      brElement = (JAXBElement&lt;T&gt;) jaxbUnmarshaller
                                      .unmarshal(ss, BetRecordAgGR.class);
  
      ret2 = brElement.getValue();
      counter++;
      if (counter &gt; 100) {
          return brList;
      }
      /*
      *
      * String uuid1 = java.util.UUID.randomUUID()
      * .toString(); dataOpe.setEntityManager(em);
      * ret2.setID(uuid1); dataOpe.add(ret2);
      */
      brList.add((T) ret2);
      System.out.println(brList);
  }
  </code></pre>
  
  <p>The Exception:</p>
  
  <pre><code>javax.persistence.PersistenceException: org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): us.kirin.bc.BetRecordAgGR
      at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1387)
      at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1310)
      at org.hibernate.ejb.AbstractEntityManagerImpl.convert(AbstractEntityManagerImpl.java:1316)
      at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:881)
      at us.kirin.bc.service.DataService.add(DataService.java:40)
      at us.kirin.bc.service.AGServiceTest.BetHistoryAGIN(AGServiceTest.java:255)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:606)
      at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45)
      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
      at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42)
      at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
      at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
      at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263)
      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68)
      at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47)
      at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231)
      at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60)
      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229)
      at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50)
      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222)
      at org.junit.runners.ParentRunner.run(ParentRunner.java:300)
      at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
      at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
  Caused by: org.hibernate.id.IdentifierGenerationException: ids for this class must be manually assigned before calling save(): us.kirin.bc.BetRecordAgGR
      at org.hibernate.id.Assigned.generate(Assigned.java:52)
      at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:117)
      at org.hibernate.ejb.event.EJB3PersistEventListener.saveWithGeneratedId(EJB3PersistEventListener.java:78)
      at org.hibernate.event.internal.DefaultPersistEventListener.entityIsTransient(DefaultPersistEventListener.java:208)
      at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:151)
      at org.hibernate.event.internal.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:78)
      at org.hibernate.internal.SessionImpl.firePersist(SessionImpl.java:852)
      at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:826)
      at org.hibernate.internal.SessionImpl.persist(SessionImpl.java:830)
      at org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:875)
      ... 26 more
  </code></pre>