[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-4135) Merging of one-to-many relations not JPA spec compliant for lazy relations

Merging of one-to-many relations not JPA spec compliant for lazy relations -------------------------------------------------------------------------- Key: HHH-4135 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4135 Project: Hibernate Core Issue Type: Bug Components: entity-manager Environment: Hibernate 3.2.6, Hibernate EntityManager 3.4.0, Hibernate Annotations 3.4.0, Oracle Reporter: Dirk Attachments: CascadeTest.zip Topic has been posted to the Hibernate Forum. See https://forum.hibernate.org/viewtopic.php?f=1&t=999398 Summary: Suppose you have an object Master with one-to-many relation to Detail. @Entity public class Master implements Serializable { @OneToMany(mappedBy = "master", cascade={CascadeType.MERGE, CascadeType.PERSIST}) private List<Detail> details = new ArrayList<Detail>(); ... } Master is loaded without fetching Detail (= lazy) and EntityManager is closed. Master is now in detached state. Merging Master causes Hibernate EntityManager to eagerly load the Detail collection although it is in lazy state. This is not JPA spec compliant. JPA spec states: The persistence provider must not merge fields marked LAZY that have not been fetched: it must ignore such fields when merging. See 3.2.4.1 Merging Detached Entity State, p.51. Tested also with the latest version of EclipseLink. EclipseLink behaves as expected. Testcase attached (Netbeans 6.7).