org.springframework.orm.jpa

## Class SharedEntityManagerCreator

- java.lang.Object
- - org.springframework.orm.jpa.SharedEntityManagerCreator

-     public abstract class SharedEntityManagerCreator
      extends Object

  Factory for a shareable JPA `EntityManager` for a given `EntityManagerFactory`.

  The shareable EntityManager will behave just like an EntityManager fetched from an application server's JNDI environment, as defined by the JPA specification. It will delegate all calls to the current transactional EntityManager, if any; otherwise it will fall back to a newly created EntityManager per operation.

  Since:
    2.0
  Author:
    Juergen Hoeller, Rod Johnson
  See Also:
    `LocalEntityManagerFactoryBean`, `JpaTransactionManager`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `SharedEntityManagerCreator()`

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `static EntityManager` | `createSharedEntityManager(EntityManagerFactory emf)` Create a transactional EntityManager proxy for the given EntityManagerFactory.
    `static EntityManager` | `createSharedEntityManager(EntityManagerFactory emf, Map properties)` Create a transactional EntityManager proxy for the given EntityManagerFactory.
    `static EntityManager` | `createSharedEntityManager(EntityManagerFactory emf, Map properties, Class... entityManagerInterfaces)` Create a transactional EntityManager proxy for the given EntityManagerFactory.

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### SharedEntityManagerCreator

          public SharedEntityManagerCreator()

  - ### Method Detail

    - #### createSharedEntityManager

          public static EntityManager createSharedEntityManager(EntityManagerFactory emf)

      Create a transactional EntityManager proxy for the given EntityManagerFactory.
      Parameters:
        `emf` - the EntityManagerFactory to delegate to. If this implements the `EntityManagerFactoryInfo` interface, appropriate handling of the native EntityManagerFactory and available `EntityManagerPlusOperations` will automatically apply.
      Returns:
        a shareable transaction EntityManager proxy

    - #### createSharedEntityManager

          public static EntityManager createSharedEntityManager(EntityManagerFactory emf,
                                                Map properties)

      Create a transactional EntityManager proxy for the given EntityManagerFactory.
      Parameters:
        `emf` - the EntityManagerFactory to delegate to. If this implements the `EntityManagerFactoryInfo` interface, appropriate handling of the native EntityManagerFactory and available `EntityManagerPlusOperations` will automatically apply.
        `properties` - the properties to be passed into the `createEntityManager` call (may be `null`)
      Returns:
        a shareable transaction EntityManager proxy

    - #### createSharedEntityManager

          public static EntityManager createSharedEntityManager(EntityManagerFactory emf,
                                                Map properties,
                                                Class... entityManagerInterfaces)

      Create a transactional EntityManager proxy for the given EntityManagerFactory.
      Parameters:
        `emf` - EntityManagerFactory to obtain EntityManagers from as needed
        `properties` - the properties to be passed into the `createEntityManager` call (may be `null`)
        `entityManagerInterfaces` - the interfaces to be implemented by the EntityManager. Allows the addition or specification of proprietary interfaces.
      Returns:
        a shareable transactional EntityManager proxy