How to get DataSource or Connection from JPA2 EntityManager in Java EE 6

Question

I have a working application where I use Java EE 6 with EclipseLink for persistence and a PostgreSQL database.

For the User-Registration I want to set the password i

Answer 1

Here is a snippet of code that works with Hibernate 4, based on dulon's answer

Connection getConnection() {
        Session session = entityManager.unwrap(Session.class);
        MyWork myWork = new MyWork();
        session.doWork(myWork);
        return myWork.getConnection();
}


private static class MyWork implements Work {

    Connection conn;

    @Override
    public void execute(Connection arg0) throws SQLException {
        this.conn = arg0;
    }

    Connection getConnection() {
        return conn;
    }

}