Is it possible to load all data in memory using JPA or Hibernate directly, do many transactions like create, delete, update and finally make a commit when I want?.
I am trying to do something like Weblogic does, the user locks a console, does many transactions (create services, delete accounts, update costumers etc) and at the end when he presses a button, all changes are committed.

It depends if you have enough memory (-Xmx) in your java virtual machine in way to hold all your entities without running into OutOfMemory.
But generally speaking it makes only sense for performance reasons by configuring an appropriate sencond level cache implementation.



You can do this in Hibernate (as well as with JPA or Hibernate directly)
Hibernate offers different ways for doing transaction demarcation.
One of it is manual transaction demarcation.

Just to be clear: create, delete, update actions itself are not transactions.
Under "Transaction" we understand the whole thing which is happening between a begin and
the final commit or rollback.