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https://stackoverflow.com/questions/36021946/why-does-hibernate-not-support-nested-transactions-outside-of-spring
What you most likely mean with support by spring is @Transactional annotations on multiple methods in a call hierarchie. What spring does in that situation is to check is there an ongoing transaction if not start a new one. You might think that the following situation is a nested transaction.
https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/transaction/support/AbstractPlatformTransactionManager.html
The recommended solution for handling failure of a subtransaction is a "nested transaction", where the global transaction can be rolled back to a savepoint taken at the beginning of the subtransaction. PROPAGATION_NESTED provides exactly those semantics; however, it will only work when nested transaction support is available.
https://www.tutorialspoint.com/spring/spring_transaction_management.htm
Spring's transaction support aims to provide an alternative to EJB transactions by adding transaction capabilities to POJOs. Spring supports both programmatic and declarative transaction management. EJBs require an application server, but Spring transaction management can be implemented without the need of an application server.
https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/transaction/annotation/Propagation.html
Note: Actual creation of a nested transaction will only work on specific transaction managers. Out of the box, this only applies to the JDBC DataSourceTransactionManager. Some JTA providers might support nested transactions as well.
https://docs.spring.io/spring-framework/docs/4.2.x/spring-framework-reference/html/transaction.html
The Spring Framework’s transaction management support changes traditional rules as to when an enterprise Java application requires an application server. In particular, you do not need an application server simply for declarative transactions through EJBs.
https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/jdbc/datasource/DataSourceTransactionManager.html
This transaction manager supports nested transactions via the JDBC 3.0 Savepoint mechanism. The "nestedTransactionAllowed" flag defaults to "true", since nested transactions will work without restrictions on JDBC drivers that support savepoints (such as the Oracle JDBC driver).
https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/transaction/support/TransactionSynchronizationManager.html
If transaction synchronization isn't active, there is either no current transaction, or the transaction manager doesn't support transaction synchronization. Synchronization is for example used to always return the same resources within a JTA transaction, e.g. a JDBC Connection or a Hibernate Session for any given DataSource or SessionFactory ...
http://mvpjava.com/spring-nested-transactions/
Aug 21, 2019 · Spring Nested Transactions – Spring AOP Limitation. Not all transaction managers support nested transactions. Spring supports this out of the box only with the JDBC DataSourceTransactionManager, which is what we’ll cover. This probably has to do with the fact that nested transactions cover a minority of use cases and make a specification ...
https://www.ibm.com/developerworks/community/forums/html/topic?id=7f89d754-40d1-42cf-b00e-a2198e49f571
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https://www.baeldung.com/spring-transactional-propagation-isolation
Oct 20, 2019 · For NESTED propagation, Spring checks if a transaction exists, then if yes, it marks a savepoint. This means if our business logic execution throws an exception, then transaction rollbacks to this savepoint. If there's no active transaction, it works like REQUIRED. DataSourceTransactionManager supports this propagation out-of-the-box.
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