This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Persistence context propagation is supported for any type of an entity manager?
No, not for application managed entity managers (see jpa spec 5.7).
Type of EntityManager:Transaction-Scoped OR extended.
Yes: If the entity manager is container managed, you can use the field "type" in @PersistenceContext (extended only applies for stateful session beans!). And application managed entity managers are always extended (see again jpa spec 5.7).