Insert does not occur when using @PostPersist to insert a new entity into Oracle or Postgres with JBoss EAP 5

Issue

Assume there exists an entity A which has an EntityListener. Within the entity listener's @PostPersist method, a stateless session bean is called to persist another entity, H, using an EntityManager from the same PersistenceUnit as used to persist A. When the backend database is MySQL or Hypersonic, H is inserted, but when executing against Oracle, H is not inserted, although no Exceptions are logged.