I am in the process of implementing a number of worker threads. My simple concern is how many sessions I should use.

Should I use a session per worker thread or can I use a common session. Using a common session, multiple transactions would be created concurrently within the same session.

Is that supported/advisable ?

Henrik

The session is not thread safe, it is not intendet to use it with multiple threads at the same time. Either syncronize the access to the session or use one session per thread.

Understood, but if it is synchronised, how will the following behave :



Will tx2.commit() commit both objects

To me it seems that Transmissions are intended to be used sequentially with the previous transaction committed before a new one is begun.

Please take a look at http://www.hibernate.org/hib_docs/reference/html/transactions.html#transactions-s2 - You should not create multiple transactions for one database connection (a session is usually associated with one database connection unless you use disconnect/reconnect). Just use one session per thread, unless you really know what you are doing.