Java.lang.ExceptionInInitializerError,Could not instantiate TransactionMana

Question

hi all,
<b>i am using SAP Netweaver Developer studio. have problem using hibernate in a EJB Modul Project. i have create a stateless session bean to writie the bussiness logic using my hibernate mapping classes, but somehow i get the error:</b>
Details: com.sap.engine.services.ejb.exceptions.BaseEJBException: Exception in method createPerson.
     at src.ejb.HibernateLocalLocalObjectImpl0.createPerson(HibernateLocalLocalObjectImpl0.java:407)
     at com.servlet.TestServlet.doPost(TestServlet.java:66)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:760)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.runServlet(HttpHandlerImpl.java:391)
     at com.sap.engine.services.servlets_jsp.server.HttpHandlerImpl.handleRequest(HttpHandlerImpl.java:265)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:345)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.startServlet(RequestAnalizer.java:323)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.invokeWebContainer(RequestAnalizer.java:865)
     at com.sap.engine.services.httpserver.server.RequestAnalizer.handle(RequestAnalizer.java:240)
     at com.sap.engine.services.httpserver.server.Client.handle(Client.java:92)
     at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:148)
     at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37)
     at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71)
     at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37)
     at java.security.AccessController.doPrivileged(Native Method)
     at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94)
     at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162)
Caused by: java.lang.ExceptionInInitializerError
     at src.hibernate.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:29)
     at src.ejb.HibernateBean.createPerson(HibernateBean.java:158)
     at src.ejb.HibernateLocalLocalObjectImpl0.createPerson(HibernateLocalLocalObjectImpl0.java:391)
     ... 17 more
Caused by: org.hibernate.HibernateException: Could not instantiate TransactionManagerLookup
     at org.hibernate.transaction.TransactionManagerLookupFactory.getTransactionManagerLookup(TransactionManagerLookupFactory.java:47)
     at org.hibernate.transaction.JTATransactionFactory.configure(JTATransactionFactory.java:48)
     at org.hibernate.transaction.TransactionFactoryFactory.buildTransactionFactory(TransactionFactoryFactory.java:51)
     at org.hibernate.cfg.SettingsFactory.createTransactionFactory(SettingsFactory.java:401)
     at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:129)
     at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1933)
     at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1216)
     at src.hibernate.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:24)
     ... 19 more
<b>is there  anybody can tell me why i am getting this error? i was sitting in front of the computer for days now, but could find out where i am doing wrong.
i have tested my hibernate classes without session beans(in a normal java Project, every thing works fine. and i tried to do exactly what they have done in the HibernateExampleEHCache examples, to combine my hibernate with session beans together, but couldn't get the programm running.  </b>

Answer 1

Are you sure this is the right value for the class name?
org.hibernate.transaction.SAPWebASTransactionManagerLookup
<b>No, i am not sure. i just copied it from a example. but i think i will not need it. so i have deleted them now.</b>
Looks as well like you have implemented a primary index scheme (next value) that is not supported by your DB ?
See error on DUAL
<b>I just used sequence for the primary key in my Person.hbm.xml.  even i change it to native, it comes back with the same error too.</b>
<b>Person.hbm.xml:</b>
<class name="src.hibernate.Person" table="TMP_PERSON">
<id name="id" column="PERSONID">
<generator class="native"/>
<b>java class:</b>
public class Person {
     private Long id;
                getter and setter
<b>my method in a stateless session bean:</b>
public Long createPerson(
          String surname,
          String firstname,
          String tel,
          String email) {
          Session session = null;
          Transaction tx = null;
          try {
               session = HibernateSessionFactory.openSession();
               tx = session.beginTransaction();
               Person aPerson = new Person();
               aPerson.setSurname(surname);
               aPerson.setFirstname(firstname);
               aPerson.setTelNr(tel);
               aPerson.setEmail(email);
               Long personId = (Long)session.save(aPerson);
               tx.commit();
               return personId;
          } catch (HibernateException e) {
               if (tx != null)
                    tx.rollback();
               throw new HibernateException(e);
          } finally {
               HibernateSessionFactory.closeSession(session);