Question Re: java.lang.ExceptionInInitializerError,Could not instantiate TransactionMana in Technology Q&A

java.lang.ExceptionInInitializerError,Could not instantiate TransactionMana

Former Member — Sat, 11 Nov 2006 21:41:45 GMT

hi all,

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:

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

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.

Re: java.lang.ExceptionInInitializerError,Could not instantiate TransactionMana

Former Member — Sat, 11 Nov 2006 22:43:35 GMT

now i have delete this part from my hibernate,cfg,xml

org.hibernate.transaction.JTATransactionFactory

</property>

org.hibernate.transaction.SAPWebASTransactionManagerLookup

</property>

hibernate/SessionFactory

</property>

org.hibernate.cache.EhCacheProvider

</property>

<!~~<property name="hibernate.cache.use_query_cache">true</property>~~>

the error changed to:

org.hibernate.HibernateException: org.hibernate.exception.GenericJDBCException: could not get next sequence value

Caused by: com.sap.sql.log.OpenSQLException: The SQL statement "SELECT "HIBERNATE_SEQUENCE"."NEXTVAL" FROM "DUAL"" contains the semantics error[s]: table "DUAL" unknown

Re: java.lang.ExceptionInInitializerError,Could not instantiate TransactionMana

Former Member — Sun, 12 Nov 2006 14:43:29 GMT

Are you sure this is the right value for the class name?

org.hibernate.transaction.SAPWebASTransactionManagerLookup

Is it on the classpath?

Message was edited by:

F.J. Brandelik

Looks as well like you have implemented a primary index scheme (next value) that is not supported by your DB ?

See error on DUAL

Re: java.lang.ExceptionInInitializerError,Could not instantiate TransactionMana

Former Member — Sun, 12 Nov 2006 16:24:44 GMT

Are you sure this is the right value for the class name?

org.hibernate.transaction.SAPWebASTransactionManagerLookup

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.

Looks as well like you have implemented a primary index scheme (next value) that is not supported by your DB ?

See error on DUAL

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.

Person.hbm.xml:

java class:

public class Person {

private Long id;

getter and setter

...}

my method in a stateless session bean:

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);

}

Re: java.lang.ExceptionInInitializerError,Could not instantiate TransactionMana

Former Member — Sun, 12 Nov 2006 17:47:02 GMT

changed the generator class to increment, then works ok. seems like native and sequence will not be supported!

Message was edited by:

Ting Ao