[Hibernate] problem in using JTA datasources

[dosapati]

I am facing problems in using UserTransaction & JTA datasource with Hibernate.   I am using JOTM as TransactionManager and XAPool ass JTA datasource. To use them, first I resitered them from Tomcat's server.xml as Resources. My java code is like this:     try {       Context ctx = new InitialContext();       ut = (UserTransaction)ctx.lookup("java:comp/UserTransaction");       ut.begin();       javax.sql.DataSource myDataSource = (javax.sql.DataSource) ctx.lookup("java:comp/env/MyDataSource");       myConn = myDataSource.getConnection();       session = sessionFactory.openSession(myConn);       Cat princess = new Cat();       princess.setName("Princess");       princess.setSex('F');       princess.setWeight(7.4f);       session.save(princess);       session.save(princess);         System.out.println("committing Transaction...");       ut.commit();       myConn.close();       session.close();    }catch(Exception ex) {         System.out.println("rollingback Transaction...");         ut.rollback();    }     The first print statement 'committing Transaction.....' is getting printed when I execute the above code. But the changes are not getting updated in database. This is working when I start Transaction from session.beginTransaction() and not setting the external connection to the Session object.   What was the wrong with my code?. I could not find any example code or any post on using JTA Transaction Manager and JTA datasource with Hibernate. Any suggessions are appreciated.   Thanks in advance! Dosapati