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- Spring - @Transactional - What happens in background?
For target beans annotated with @Transactional, Spring will create a TransactionInterceptor, and pass it to the generated proxy object So when you call the method from client code, you're calling the method on the proxy object, which first invokes the TransactionInterceptor (which begins a transaction), which in turn invokes the method on your
- java - What is the difference between defining @Transactional on class . . .
The @Transactional annotation on the class level will be applied to every method in the class However, when a method is annotated with @Transactional (like, updateFoo(Foo foo)) this will take precedence over the transactional settings defined at the class level More info: Transaction management in Spring
- java - javax. transaction. Transactional vs org. springframework . . .
Spring has defined its own Transactional annotation to make Spring bean methods transactional, years ago Java EE 7 has finally done the same thing and now allows CDI bean methods to be transactional, in addition to EJB methods So since Java EE 7, it also defines its own Transactional annotation (it obviously can't reuse the Spring one)
- java - How to pick a Kafka transaction. id - Stack Overflow
It also increments an epoch associated with the transactional id The epoch is an internal piece of metadata stored for every transactional id Once the epoch is bumped, any producers with same transactional id and an older epoch are considered zombies and are fenced off, ie future transactional writes from those producers are rejected
- Annotation @Transactional. How to rollback? - Stack Overflow
It really works this way :-) If you have a service calling several DAOs, the service needs to have a @Transactional annotation as well Otherwise each DAO call start and commits new transaction before you throw an exception in the service The bottom line is: the exception must leave (escape) a method marked as @Transactional –
- How does @Transactional work on test methods? - Stack Overflow
@Transactional spans the transaction for entire test method, so if you use some dao (like in your case) that transaction will be rolledback also, however if some method uses transaction propagation type other than REQUIRED, for example REQUIRED_NEW, call to db can be performed anyway, because REQUIRED_NEW suspends current transaction from the
- What are advantages of using @Transactional(readOnly = true)?
From the explanation of Oliver Gierke - the Spring Data author: Reading methods like findAll() and findOne(…) are using @Transactional(readOnly = true) which is not strictly necessary but triggers a few optimizations in the transaction infrastructure (setting the FlushMode to MANUAL to let persistence providers potentially skip dirty checks when closing the EntityManager)
- java - Springs JdbcTemplate and Transactions - Stack Overflow
If you have not configured transactions in any way - programmatically, usually via PlatformTransactionManager or TransactionTemplate (which is just a more high level api for PlatformTransactionManager), or using declarative approach, via annotations, like spring @Transactional - then every SQL query issued by JdbcTemplate will be run outside
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