Example & Tutorial understanding programming in easy ways.

Transactions and Concurrency in Hibernate

The most important point about Hibernate Entity Manager and concurrency control is that it is very easy to

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Entity manager and transaction scopes

To complete this picture you also have to think about database transactions

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Unit of work

The challenge is the implementation of this (and other) behavior outside an EJB3 container.

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Long units of work

A first naive implementation might keep the EntityManager and database transaction open during user

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Considering object identity

This approach leaves Hibernate and the database to worry about concurrency.

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Common concurrency control issues

Make sure you understand the implications before making a design decision.

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Database transaction demarcation

A JPA application can run in non-managed

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Non-managed environment

A call to close() marks the end of an EntityManager.

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EntityTransaction

It also provide a way to mark a transaction as rollback only, ie force the transaction to rollback.

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Using JTA

With Container Managed Transactions (CMT) in an EJB3 container, transaction demarcation

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Exception handling

The Hibernate entity manager generally raises exceptions which encapsulate the Hibernate core exception.

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EXTENDED Persistence Context

In an EXTENDED persistence context, all read only operations of the entity

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Container Managed Entity Manager

This is perfect to implement the entitymanager-per-conversation pattern.

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Application Managed Entity Manager

It is not legal to call entityManager.joinTransaction() if no JTA transaction is involved.

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Optimistic concurrency contro

The use cases we show are in the context of long application transactions but version checking.

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Application version checking in Hibernate

The version property is mapped using @Version, and the entity manager will automatically

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Extended entity manager and automatic versioning

This pattern is problematic if the persistence context is too big to be stored during user think time,

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Detached objects and automatic versioning

The application manipulates the state of detached instances originally loaded in another persistence context

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