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3.9.2. Outside a transaction

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In an EXTENDED persistence context, all read only operations of the entity manager can be executed outside a transaction (find(), getReference(), refresh(), and read queries). Some modifications operations can be executed outside a transaction, but they are queued until the persistence context join a transaction. This is the case of persist(), merge(), remove(). Some operations cannot be called outside a transaction: flush(), lock(), and update/delete queries.
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