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Is it possible to nest @Transactional annotated methods in spring? Consider something like this:
@Transactional public void a() { obj.b(); } @Transactional public void b() { // ... } What happens in such a case if I rollback in b() and rollback in a() ?
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Spring nested transactions are a bit like the black sheep of the transaction family – easily misunderstood and cast aside in documentation. Nested transactions are however incredibly useful for use cases consisting of large bulk updates and/or operating over unreliable connections.
Definition. A nested transaction model as proposed by Moss is a generalization of the flat transaction model that allows nesting. A nested transaction forms a tree of transactions with the root being called a top-level transaction and all other nodes called nested transactions (subtransactions).
A flat or nested transaction that accesses objects handled by different servers is referred to as a distributed transaction.
The second @Transactional annotation on method b() is not required because by default @Transactional has a propagation of REQUIRED, therefore methods called by method a() will be transactional. If you are looking to start a new transaction within a method called by method a() you will need to modify the propagation rules. Read about Transaction Propagation.
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