What is jta in hibernate

What is the main advantage of using Hibernate than sql? What is the difference between beans and Hibernate? How will you retrieve an object by Identifier from the database in Hibernate?

What is Hibernate Query By Example? What are the various fetching strategies from the database in Hibernate? What is outer join fetching in Hibernate?

What is Lazy fetching in Hibernate? Difference between getCurrentSession and openSession in Hibernate? What are the Collection types in Hibernate? What are the various transaction isolation isssues in Hibernate? What are the various Catching strategies in Hibernate? What are the various mapping association in Hibernate? Which interfaces are defined to execute the query in the Hibernate? What are the Hibernate join options? Explain the Fetching association in HQL?

What are the different caching services provided by the Hibernate? Hibernate disables, or expects the application server to disable, auto-commit mode immediately. Database transactions are never optional. All communication with a database must be encapsulated by a transaction. Avoid auto-commit behavior for reading data, because many small transactions are unlikely to perform better than one clearly-defined unit of work, and are more difficult to maintain and extend.

Using auto-commit does not circumvent database transactions. Instead, when in auto-commit mode, JDBC drivers simply perform each call in an implicit transaction call. It is as if your application called commit after each and every JDBC call. This is the most common transaction pattern. Web applications are a prime example of this type of system, though certainly not the only one.

At the beginning of handling such a request, the application opens a Hibernate Session , starts a transaction, performs all data related work, ends the transaction and closes the Session.

The crux of the pattern is the one-to-one relationship between the transaction and the Session. Within this pattern there is a common technique of defining a current session to simplify the need of passing this Session around to all the application components that may need access to it. Hibernate provides support for this technique through the getCurrentSession method of the SessionFactory. The concept of a "current" session has to have a scope that defines the bounds in which the notion of "current" is valid.

This is purpose of the org. CurrentSessionContext contract. There are 2 reliable defining scopes:. First is a JTA transaction because it allows a callback hook to know when it is ending which gives Hibernate a chance to close the Session and clean up. This is represented by the org. JTASessionContext implementation of the org. Using this implementation, a Session will be opened the first time getCurrentSession is called within that transaction.

Secondly is this application request cycle itself. This is best represented with the org. ManagedSessionContext implementation of the org. Here an external component is responsible for managing the lifecycle and scoping of a "current" session. At the start of such a scope, ManagedSessionContext 's bind method is called passing in the Session.

At the end, its unbind method is called. Filter implementation. Due to a limitation of the JTA specification, Hibernate cannot automatically clean up any unclosed ScrollableResults or Iterator instances returned by scroll or iterate.

Release the underlying database cursor by calling ScrollableResults. The session-per-request pattern is not the only valid way of designing units of work. Many business processes require a whole series of interactions with the user that are interleaved with database accesses. In web and enterprise applications, it is not acceptable for a database transaction to span a user interaction.

Consider the following example:. The first screen of a dialog opens. The data seen by the user is loaded in a particular Session and database transaction. The user is free to modify the objects.

The user uses a UI element to save their work after five minutes of editing. The modifications are made persistent. The user also expects to have exclusive access to the data during the edit session. Even though we have multiple databases access here, from the point of view of the user, this series of steps represents a single unit of work.

There are many ways to implement this in your application. A first naive implementation might keep the Session and database transaction open while the user is editing, using database-level locks to prevent other users from modifying the same data and to guarantee isolation and atomicity.

This is an anti-pattern, because lock contention is a bottleneck which will prevent scalability in the future. Several database transactions are used to implement the conversation.

In this case, maintaining isolation of business processes becomes the partial responsibility of the application tier. A single conversation usually spans several database transactions. These multiple database accesses can only be atomic as a whole if only one of these database transactions typically the last one stores the updated data. All others only read data. Hibernate includes some features which make this easy to implement. Hibernate can perform automatic optimistic concurrency control for you.

It can automatically detect if a concurrent modification occurred during user think time. Check for this at the end of the conversation. This not just affects connection releasing, there are other callbacks attached to Session closing as well which will be missing here.

Auto-closing is effectively handled by Hibernate's SessionImpl. You could set a breakpoint there to see what's actually happening,. It never called SessionImpl. Added "hibernate. JtaTransactionCoordinatorBuilderImpl or just short name jta works correctly. Check the document :. If a non-JPA application does not provide a setting for hibernate. This default will cause problems if the application actually uses JTA-based transactions.

TransactionCoordinatorBuilder that builds a org. TransactionCoordinator that properly coordinates with JTA-based transactions. May I ask if Spring can have some help on this? Maybe add a side note on document that the default setting only work with HibernateTransactionManager , using JtaTransactionManager need to change this hibernate property. Thanks a lot for the thorough analysis and the quick turnaround there!

So it looks like we can not only document that this property needs to be configured but also implicitly set it behind our setJtaTransactionManager arrangement. I'm not sure why Hibernate doesn't set it automatically when it discovered an active JpaPlatform. In any case, we'll do what we can do document this on our end. I also set breakpoint on SessionImpl. I also tried to change hibernate.

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