[rules-users] How to remove a persisted session from the database ?

Hi, I am using persistence, and since the sessions don't seem to have a standard way of getting removed from the database when they are not needed anymore, I am wondering how to do that. I am using JPA but if I call : em.remove(someSessionInfo); where em is the JPA EntityManager, that does not remove the entry from the database. if I try to use a Query returned by the em.createQuery("delete from SessionInfo where id = 1") it complains that it needs a transaction, and since I don't know how to get around the issue I am stuck. Any help would be appreciated. Thanks