Problems when trying to get a connection

Hi, i'm doing some tests with Hibernate but i'm getting an error when Hibernate tries to get a connection from a pooled datasource.
Here is my session factory configuration:
<session-factory>
    <property name="transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property>
    <property name="connection.datasource">jdbc/CORE_DS</property>
    <property name="dialect">org.hibernate.dialect.SQLServerDialect</property>
</session-factory>
I created a jdbc2.0 datasource called jdbc/CORE_DS
This is the error i'm getting:
     java.lang.ExceptionInInitializerError
     at com.sap.engine.services.ejb.exceptions.BaseRemoteException.writeReplace(BaseRemoteException.java:276)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
     at java.lang.reflect.Method.invoke(Method.java:324)
     at java.io.ObjectStreamClass.invokeWriteReplace(ObjectStreamClass.java:896)
     at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1011)
     at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
     at com.sap.engine.services.rmi_p4.DispatchImpl.throwException(DispatchImpl.java:135)
     at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:296)
     at com.sap.engine.services.rmi_p4.DispatchImpl._run(DispatchImpl.java:183)
     at com.sap.engine.services.rmi_p4.server.P4SessionProcessor.request(P4SessionProcessor.java:119)
     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 test.util.HibernateUtil.<clinit>(HibernateUtil.java:22)
     at test.vo.EventManager.listEvents(EventManager.java:41)
     at test.ejb.EventHandlerBean.getEvents(EventHandlerBean.java:54)
     at test.ejb.EventHandlerObjectImpl0.getEvents(EventHandlerObjectImpl0.java:204)
     at test.ejb.EventHandlerObjectImpl0p4_Skel.dispatch(EventHandlerObjectImpl0p4_Skel.java:119)
     at com.sap.engine.services.rmi_p4.DispatchImpl._runInternal(DispatchImpl.java:294)
     ... 8 more
Caused by: java.lang.NullPointerException
     at com.sap.engine.services.dbpool.spi.CPManagedConnectionFactoryImpl.createManagedConnection(CPManagedConnectionFactoryImpl.java:145)
     at com.sap.engine.services.connector.jca.ConnectionHashSet.match(ConnectionHashSet.java:312)
     at com.sap.engine.services.connector.jca.ConnectionManagerImpl.allocateConnection(ConnectionManagerImpl.java:231)
     at com.sap.engine.services.dbpool.cci.ConnectionFactoryImpl.getConnection(ConnectionFactoryImpl.java:51)
     at org.hibernate.connection.DatasourceConnectionProvider.getConnection(DatasourceConnectionProvider.java:59)
     at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:72)
     at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1463)
     at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1004)
     at test.util.HibernateUtil.<clinit>(HibernateUtil.java:18)
     ... 13 more
any ideas?
Thanks,
Juan Manuel
Message was edited by: Juan Sanmarco

Hi we are having a similar issue, could you please specify how you solved this?
Thanks
regards
Vincenzo

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