[jboss-user] [Persistence, JBoss/CMP, Hibernate, Database] - Lazy children loaded when persist is called

Let's say we have an entity that has a OneToMany relationship declared like this : | @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "Parent") | public Set<Child> getChildren() { | return this.children; | } | | public void setChildren(Set<Child> children) { | this.children = children; | } | When I call persist on the entity, hibernate firsts populates the list of children although I have never accessed the getter. Here is the call in a stateless session bean: | | package org.domain.services.users; | | import javax.ejb.Stateless; | import javax.persistence.EntityManager; | import javax.persistence.PersistenceContext; | | import org.domain.SeamOne.entity.Parent; | import org.domain.services.users.ParentManager; | | public @Stateless | class ParentManagerBean implements ParentManager { | | @PersistenceContext | private EntityManager em; | | public void ChangeName(String pName, String pId) { | Parent parent = em.find(Parent.class, pId); | // An hibernate trace just appeared that shows a select just for | // the parent class | | parent.setName( pName ); | | | em.persist(parent); | // An hibernate trace just appeared that shows a select to populate | // the children | } | } | | When I first saw the traces from hibernate, I didn't know for sure which call had produced the traces. I then started jboss in debug mode and stepped through the code to realize that the children were loaded on the persist call. My code works fine, but I can't see the need for that query when the children have not been accessed because they can't be dirty. I've tried removing the "cascade = CascadeType.ALL" and it then doesn't do the query, but I now have to call persist on the children of the class when they have been modified. Is there a reason for that behavior? Is that an bug? Is there a way to circumvent this without loosing the cascading feature? Thank you all, Sylvain Catudal View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4195970#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...