session closed in the middle of transaction

[tuxzilla]

I have a transaction enclosing a batch job of 100,000 database records. I get the transaction using

entityManager.getDelegate().beginTransaction();

where entityManager is the Seam managed persistent context (default settings)

@In

private EntityManager entityManager;

I always get a fail to lazy load ... session closed in the midde of the transaction. Is there a way i can extend the timeout of the session for as long as it takes?

Thanks.