javax.persistence

Interface PersistenceUnitUtil

Contents
  • All Superinterfaces:
    PersistenceUtil

    public interface PersistenceUnitUtil
extends PersistenceUtil
    Utility interface between the application and the persistence provider managing the persistence unit.

    The methods of this interface should only be invoked on entity instances obtained from or managed by entity managers for this persistence unit or on new entity instances.

    Since:
    Java Persistence 2.0

    • Method Detail

      • isLoaded

        boolean isLoaded(Object entity,
                 String attributeName)
        Determine the load state of a given persistent attribute of an entity belonging to the persistence unit.
        Specified by:
        isLoaded in interface PersistenceUtil
        Parameters:
        entity - entity instance containing the attribute
        attributeName - name of attribute whose load state is to be determined
        Returns:
        false if entity's state has not been loaded or if the attribute state has not been loaded, else true

      • isLoaded

        boolean isLoaded(Object entity)
        Determine the load state of an entity belonging to the persistence unit. This method can be used to determine the load state of an entity passed as a reference. An entity is considered loaded if all attributes for which FetchType.EAGER has been specified have been loaded.

        The isLoaded(Object, String) method should be used to determine the load state of an attribute. Not doing so might lead to unintended loading of state.

        Specified by:
        isLoaded in interface PersistenceUtil
        Parameters:
        entity - entity instance whose load state is to be determined
        Returns:
        false if the entity has not been loaded, else true

      • getIdentifier

        Object getIdentifier(Object entity)
        Return the id of the entity. A generated id is not guaranteed to be available until after the database insert has occurred. Returns null if the entity does not yet have an id.
        Parameters:
        entity - entity instance
        Returns:
        id of the entity
        Throws:
        IllegalArgumentException - if the object is found not to be an entity

Document created the 11/06/2005, last modified the 18/08/2025
Source of the printed document:https://www.gaudry.be/en/java-api-javaee-rf-javax/persistence/PersistenceUnitUtil.html

The infobrol is a personal site whose content is my sole responsibility. The text is available under CreativeCommons license (BY-NC-SA). More info on the terms of use and the author.

References

  1. View the html document Language of the document:fr Manuel PHP : https://docs.oracle.com, PersistenceUnitUtil (Java(TM) EE 7 Specification APIs)

These references and links indicate documents consulted during the writing of this page, or which may provide additional information, but the authors of these sources can not be held responsible for the content of this page.
The author of this site is solely responsible for the way in which the various concepts, and the freedoms that are taken with the reference works, are presented here. Remember that you must cross multiple source information to reduce the risk of errors.