org.springframework.orm.jpa
Class EntityManagerFactoryUtils

java.lang.Object
  org.springframework.orm.jpa.EntityManagerFactoryUtils

public abstract class EntityManagerFactoryUtils
extends Object

Helper class featuring methods for JPA EntityManager handling, allowing for reuse of EntityManager instances within transactions. Also provides support for exception translation.

Mainly intended for internal use within the framework.

Since:

2.0

Author:

Juergen Hoeller

Field Summary

static int

ENTITY_MANAGER_SYNCHRONIZATION_ORDER Order value for TransactionSynchronization objects that clean up JPA EntityManagers.

Constructor Summary

EntityManagerFactoryUtils()

Method Summary

static DataAccessException	convertJpaAccessExceptionIfPossible(RuntimeException ex) Convert the given runtime exception to an appropriate exception from the org.springframework.dao hierarchy.
static javax.persistence.EntityManager	doGetTransactionalEntityManager(javax.persistence.EntityManagerFactory emf, Map properties) Obtain a JPA EntityManager from the given factory.
static javax.persistence.EntityManager	getTransactionalEntityManager(javax.persistence.EntityManagerFactory emf) Obtain a JPA EntityManager from the given factory.
static javax.persistence.EntityManager	getTransactionalEntityManager(javax.persistence.EntityManagerFactory emf, Map properties) Obtain a JPA EntityManager from the given factory.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

ENTITY_MANAGER_SYNCHRONIZATION_ORDER

public static final int ENTITY_MANAGER_SYNCHRONIZATION_ORDER

Order value for TransactionSynchronization objects that clean up JPA EntityManagers. Return DataSourceUtils.CONNECTION_SYNCHRONIZATION_ORDER - 100 to execute EntityManager cleanup before JDBC Connection cleanup, if any.

See Also:

DataSourceUtils.CONNECTION_SYNCHRONIZATION_ORDER, Constant Field Values

Constructor Detail

EntityManagerFactoryUtils

public EntityManagerFactoryUtils()

Method Detail

getTransactionalEntityManager

public static javax.persistence.EntityManager getTransactionalEntityManager(javax.persistence.EntityManagerFactory emf)
                                                                     throws DataAccessResourceFailureException

Obtain a JPA EntityManager from the given factory. Is aware of a corresponding EntityManager bound to the current thread, for example when using JpaTransactionManager.

Note: Will return null if no thread-bound EntityManager found!

Parameters:

emf - EntityManagerFactory to create the EntityManager with

Returns:

the EntityManager, or null if none found

Throws:

DataAccessResourceFailureException - if the EntityManager couldn't be obtained

See Also:

JpaTransactionManager

getTransactionalEntityManager

public static javax.persistence.EntityManager getTransactionalEntityManager(javax.persistence.EntityManagerFactory emf,
                                                                            Map properties)
                                                                     throws DataAccessResourceFailureException

Obtain a JPA EntityManager from the given factory. Is aware of a corresponding EntityManager bound to the current thread, for example when using JpaTransactionManager.

Note: Will return null if no thread-bound EntityManager found!

Parameters:

emf - EntityManagerFactory to create the EntityManager with

properties - the properties to be passed into the createEntityManager call (may be null)

Returns:

the EntityManager, or null if none found

Throws:

DataAccessResourceFailureException - if the EntityManager couldn't be obtained

See Also:

JpaTransactionManager

doGetTransactionalEntityManager

public static javax.persistence.EntityManager doGetTransactionalEntityManager(javax.persistence.EntityManagerFactory emf,
                                                                              Map properties)
                                                                       throws javax.persistence.PersistenceException

Obtain a JPA EntityManager from the given factory. Is aware of a corresponding EntityManager bound to the current thread, for example when using JpaTransactionManager.

Same as getEntityManager, but throwing the original PersistenceException.

Parameters:

emf - EntityManagerFactory to create the EntityManager with

properties - the properties to be passed into the createEntityManager call (may be null)

Returns:

the EntityManager, or null if none found

Throws:

javax.persistence.PersistenceException - if the EntityManager couldn't be created

See Also:

getTransactionalEntityManager(javax.persistence.EntityManagerFactory), JpaTransactionManager

convertJpaAccessExceptionIfPossible

public static DataAccessException convertJpaAccessExceptionIfPossible(RuntimeException ex)

Convert the given runtime exception to an appropriate exception from the org.springframework.dao hierarchy. Return null if no translation is appropriate: any other exception may have resulted from user code, and should not be translated.

The most important cases like object not found or optimistic locking failure are covered here. For more fine-granular conversion, JpaAccessor and JpaTransactionManager support sophisticated translation of exceptions via a JpaDialect.

Parameters:

ex - runtime exception that occured

Returns:

the corresponding DataAccessException instance, or null if the exception should not be translated