Package jakarta.persistence

Interface EntityManagerFactory

public interface EntityManagerFactory
Interface used to interact with the entity manager factory for the persistence unit.

When the application has finished using the entity manager factory, and/or at application shutdown, the application should close the entity manager factory. Once an EntityManagerFactory has been closed, all its entity managers are considered to be in the closed state.

Since:
1.0

  • Method Details

    • createEntityManager

      EntityManager createEntityManager()
      Create a new application-managed EntityManager. This method returns a new EntityManager instance each time it is invoked. The isOpen method will return true on the returned instance.
      Returns:
      entity manager instance
      Throws:
      IllegalStateException - if the entity manager factory has been closed

    • createEntityManager

      EntityManager createEntityManager(Map map)
      Create a new application-managed EntityManager with the specified Map of properties. This method returns a new EntityManager instance each time it is invoked. The isOpen method will return true on the returned instance.
      Parameters:
      map - properties for entity manager
      Returns:
      entity manager instance
      Throws:
      IllegalStateException - if the entity manager factory has been closed

    • createEntityManager

      EntityManager createEntityManager(SynchronizationType synchronizationType)
      Create a new JTA application-managed EntityManager with the specified synchronization type. This method returns a new EntityManager instance each time it is invoked. The isOpen method will return true on the returned instance.
      Parameters:
      synchronizationType - how and when the entity manager should be synchronized with the current JTA transaction
      Returns:
      entity manager instance
      Throws:
      IllegalStateException - if the entity manager factory has been configured for resource-local entity managers or is closed
      Since:
      2.1

    • createEntityManager

      EntityManager createEntityManager(SynchronizationType synchronizationType, Map map)
      Create a new JTA application-managed EntityManager with the specified synchronization type and map of properties. This method returns a new EntityManager instance each time it is invoked. The isOpen method will return true on the returned instance.
      Parameters:
      synchronizationType - how and when the entity manager should be synchronized with the current JTA transaction
      map - properties for entity manager
      Returns:
      entity manager instance
      Throws:
      IllegalStateException - if the entity manager factory has been configured for resource-local entity managers or is closed
      Since:
      2.1

    • getCriteriaBuilder

      CriteriaBuilder getCriteriaBuilder()
      Return an instance of CriteriaBuilder for the creation of CriteriaQuery objects.
      Returns:
      CriteriaBuilder instance
      Throws:
      IllegalStateException - if the entity manager factory has been closed
      Since:
      2.0

    • getMetamodel

      Metamodel getMetamodel()
      Return an instance of Metamodel interface for access to the metamodel of the persistence unit.
      Returns:
      Metamodel instance
      Throws:
      IllegalStateException - if the entity manager factory has been closed
      Since:
      2.0

    • isOpen

      boolean isOpen()
      Indicates whether the factory is open. Returns true until the factory has been closed.
      Returns:
      boolean indicating whether the factory is open

    • close

      void close()
      Close the factory, releasing any resources that it holds. After a factory instance has been closed, all methods invoked on it will throw the IllegalStateException, except for isOpen, which will return false. Once an EntityManagerFactory has been closed, all its entity managers are considered to be in the closed state.
      Throws:
      IllegalStateException - if the entity manager factory has been closed

    • getProperties

      Map<String,Object> getProperties()
      Get the properties and associated values that are in effect for the entity manager factory. Changing the contents of the map does not change the configuration in effect.
      Returns:
      properties
      Throws:
      IllegalStateException - if the entity manager factory has been closed
      Since:
      2.0

    • getCache

      Cache getCache()
      Access the cache that is associated with the entity manager factory (the "second level cache").
      Returns:
      instance of the Cache interface or null if no cache is in use
      Throws:
      IllegalStateException - if the entity manager factory has been closed
      Since:
      2.0

    • getPersistenceUnitUtil

      PersistenceUnitUtil getPersistenceUnitUtil()
      Return interface providing access to utility methods for the persistence unit.
      Returns:
      PersistenceUnitUtil interface
      Throws:
      IllegalStateException - if the entity manager factory has been closed
      Since:
      2.0

    • addNamedQuery

      void addNamedQuery(String name, Query query)
      Define the query, typed query, or stored procedure query as a named query such that future query objects can be created from it using the createNamedQuery or createNamedStoredProcedureQuery method.

      Any configuration of the query object (except for actual parameter binding) in effect when the named query is added is retained as part of the named query definition. This includes configuration information such as max results, hints, flush mode, lock mode, result set mapping information, and information about stored procedure parameters.

      When the query is executed, information that can be set by means of the query APIs can be overridden. Information that is overridden does not affect the named query as registered with the entity manager factory, and thus does not affect subsequent query objects created from it by means of the createNamedQuery or createNamedStoredProcedureQuery method.

      If a named query of the same name has been previously defined, either statically via metadata or via this method, that query definition is replaced.

      Parameters:
      name - name for the query
      query - Query, TypedQuery, or StoredProcedureQuery object
      Since:
      2.1

    • unwrap

      <T> T unwrap(Class<T> cls)
      Return an object of the specified type to allow access to the provider-specific API. If the provider's EntityManagerFactory implementation does not support the specified class, the PersistenceException is thrown.
      Parameters:
      cls - the class of the object to be returned. This is normally either the underlying EntityManagerFactory implementation class or an interface that it implements.
      Returns:
      an instance of the specified class
      Throws:
      PersistenceException - if the provider does not support the call
      Since:
      2.1

    • addNamedEntityGraph

      <T> void addNamedEntityGraph(String graphName, EntityGraph<T> entityGraph)
      Add a named copy of the EntityGraph to the EntityManagerFactory. If an entity graph with the same name already exists, it is replaced.
      Parameters:
      graphName - name for the entity graph
      entityGraph - entity graph
      Since:
      2.1