[rules-users] Problem in getting session from JPAKnowledgeService.newStatefulKnowledgeSession();

Hi All, follwoing is the code i used to get the session using JPAKnowledgeService.newStatefulKnowledgeSession. table for the mentioned classes are getting created, after that JPAKnowledgeService.newStatefulKnowledgeSession() method throws following exception.... EntityManagerFactory emf = Persistence.createEntityManagerFactory( "org.drools.persistence.jpa" ); Environment env = KnowledgeBaseFactory.newEnvironment(); env.set( EnvironmentName.ENTITY_MANAGER_FACTORY, emf ); env.set( EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager() ); StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession( kbase, null, env ); ------------------------- persistence.xml i copied only persistent unit part... <persistence-unit name="org.drools.persistence.jpa"> <class>org.drools.persistence.session.SessionInfo</class> <class>org.drools.persistence.processinstance.ProcessInstanceInfo</class> <class>org.drools.persistence.processinstance.ProcessInstanceEventInfo</class> <class>org.drools.persistence.processinstance.WorkItemInfo</class> <class>org.drools.persistence.processinstance.variabletypes.VariableInstanceInfo</class> <class>org.drools.persistence.processinstance.variabletypes.JPAPersistedVariable</class> <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" /> <property name="hibernate.max_fetch_depth" value="3" /> <property name="hibernate.hbm2ddl.auto" value="update" /> <property name="hibernate.show_sql" value="true" /> <property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.BTMTransactionManagerLookup" /> <property name="hibernate.connection.url" value="jdbc:oracle:thin:@192.168.4.93:1521:POST" /> <property name="hibernate.connection.driver_class" value="oracle.jdbc.driver.OracleDriver" /> <property name="hibernate.connection.password" value="voms_test" /> <property name="hibernate.connection.username" value="voms_test" /> <property name="java.naming.factory.initial" value="bitronix.tm.jndi.BitronixInitialContextFactory"/> <!-- <property name="hibernate.format_sql" value="true"/> --> </properties> </persistence-unit> but it throws exception java.lang.IllegalStateException: java.lang.reflect.InvocationTargetException at org.drools.persistence.jpa.impl.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:137) at org.drools.persistence.jpa.impl.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:61) * at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:109) at com.sample.FirstTest.main(FirstTest.java:87)* Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at org.drools.persistence.jpa.impl.KnowledgeStoreServiceImpl.buildCommanService(KnowledgeStoreServiceImpl.java:123) ... 3 more Caused by: java.lang.RuntimeException: Could not commit session or rollback at org.drools.persistence.session.SingleSessionCommandService.<init>(SingleSessionCommandService.java:132) ... 8 more Caused by: java.lang.RuntimeException: Unable to rollback transaction at org.drools.persistence.session.JtaTransactionManager.rollback(JtaTransactionManager.java:181) at org.drools.persistence.session.SingleSessionCommandService.<init>(SingleSessionCommandService.java:130) ... 8 more Caused by: java.lang.NullPointerException at org.drools.persistence.session.JtaTransactionManager.rollback(JtaTransactionManager.java:178) ... 9 more