stored procedure call is not working with "select procedure()" option

Hi ,
I have a stored procedure name "procedure()". Which I am calling
by --

Session sess = (Session)entityManager.getDelegate(); //entityManager is
javax.persistent.EntityManager[ Properly Initialise]
sess.createSQLQuery("select procedure()");

procedure is containing some truncate queries like -- EXECUTE('truncate
table abc');

It's not throwing any exception but not executing the procedure.Using
oracle query -- sess.createSQLQuery("{ call procedure()
}").executeUpdate(); procedure execution is working fine.

What's need to be change here.

Thanks and Regards,
Abhra