From the hibernate docs:
anonymous wrote : 3.8.3. Current Session context management with JTA
|
| The easiest way to handle Sessions and transactions is Hibernates automatic
"current" Session management. See the discussion of Section 2.5, ?Contextual
Sessions?. Using the "jta" session context, if there is no Hibernate Session
associated with the current JTA transaction, one will be started and associated with that
JTA transaction the first time you call sessionFactory.getCurrentSession(). The Sessions
retrieved via getCurrentSession() in "jta" context will be set to automatically
flush before the transaction completes, close after the transaction completes, and
aggressively release JDBC connections after each statement. This allows the Sessions to be
managed by the lifecycle of the JTA transaction to which it is associated, keeping user
code clean of such management concerns. Your code can either use JTA programmatically
through UserTransaction, or (recommended for portable code) use the Hibernate Transaction
API to set transaction boundaries. If you run in an EJB container, declarative transaction
demarcation with CMT is preferred.
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