Spring / Spring7 basics Interview questions
What are the types of transaction propagation in Spring?
Propagation defines how a @Transactional method behaves when it's called while a transaction is already in progress.
| Propagation | Behavior |
REQUIRED (default) | Joins the existing transaction, or starts a new one if none exists |
REQUIRES_NEW | Always suspends any existing transaction and starts a fresh one |
NESTED | Starts a savepoint within the existing transaction |
SUPPORTS | Joins a transaction if one exists; otherwise runs non-transactionally |
MANDATORY | Requires an existing transaction; throws an exception if none exists |
REQUIRES_NEW is useful when you need an inner operation, like audit logging, to commit independently of whether the outer transaction eventually rolls back.
Which propagation type is Spring's default?
Which propagation type always suspends any existing transaction to start a fresh one?
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