JPA 1.0 Transaction (Java EE 5)

Topics

Transaction Types
Transactional attributes
Entity manager and transaction types
Concurrency and locking

Transaction Types

Two different transaction types are supported in JPA
1. Resource-local transactions (RESOURCE_LOCAL)
  - Single resource
2. Java Transaction API (JTA)
  - Multiple participating resources
  - Distributed XA transactions
Transaction type is defined in persistence unit (persistence.xml file)
- In Java SE environment, the default is RESOURCE_LOCAL
- In Java EE environment, the default is JTA

RESOURCE_LOCAL

You must use the EntityManagerFactory to get an EntityManager
The resulting EntityManager represents PersistenceContext
You must use the EntityTransaction API to begin/commit around every call to your EntityManger
Calling entityManagerFactory.createEntityManager() twice results in two separate EntityManager instances and therefor two separate PersistenceContexts

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