com.javaetmoi.core.persistence.hibernate

Class JpaLazyLoadingUtil

java.lang.Object

com.javaetmoi.core.persistence.hibernate.JpaLazyLoadingUtil

public class JpaLazyLoadingUtil
extends Object

Set of helper methods that fetch a complete entity graph.

Provides a lazy way to resolve all Hibernate proxies.

Author:

Antoine Rey

Method Summary

Modifier and Type	Method and Description
static <E> Collection<E>	deepHydrate(javax.persistence.EntityManager currentEntityManager, Collection<E> entities) Populate a lazy-initialized object graph by recursivity.
static <E> E	deepHydrate(javax.persistence.EntityManager currentEntityManager, E entity) Populate a lazy-initialized object graph by recursivity.

Methods inherited from class java.lang.Object

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

Method Detail

deepHydrate

public static <E> Collection<E> deepHydrate(javax.persistence.EntityManager currentEntityManager,
                                            Collection<E> entities)

Populate a lazy-initialized object graph by recursivity.

This method deeply navigates into a graph of entities in order to resolve uninitialized Hibernate proxies.
The goal is to avoid any lazyinitializationexception once entities are detached from the Hibernate session.
May attention: this method has to be called from an open persistent context / Hibernate session.

Parameters:

currentEntityManager - current JPA entity manager still open

entities - a Collection of Hibernate entities to load

Returns:

the Collection of Hibernate entities fully loaded. Similar to the entities input parameter. Usefull when calling this method in a return statement.

deepHydrate

public static <E> E deepHydrate(javax.persistence.EntityManager currentEntityManager,
                                E entity)

Populate a lazy-initialized object graph by recursivity.

This method deeply navigates into a graph of entities in order to resolve uninitialized Hibernate proxies.
The goal is to avoid any lazyinitializationexception once entities are detached from the Hibernate session.
May attention: this method has to be called from an open persistent context / Hibernate session.

Parameters:

currentEntityManager - current JPA entity manager still open

entity - a single Hibernate entity or a simple java class referencing entities

Returns:

the Hibernate entity fully loaded. Similar to the entity input parameter. Usefull when calling this method in a return statement.