I'm really getting crazy. This is my first experience with EJB and JBoss (and Hibernate as well actually) but I'm finding a lot of problems even with the easy stuff!!! I wanna set up a one-to-many relationship between two entities, but this relationship is supposed to be bidirectional. I have a "site" entity and a "item" entity and I want to say that every site can have more than one entity. But I would like to access the sites linked to an entity from the item object and viceversa. These are the code fragments:
Site.java @OneToMany(cascade={CascadeType.ALL},fetch=FetchType.LAZY,mappedBy="site") public java.util.Collection getItems(){ return this.items; } public void setItems(Collection items){ this.items=items; } Item.java @ManyToOne public Site getSite(){ return this.site; } public void setSite(Site site){ this.site=site; } This operation seems to work actually. Jboss creates a column "site_id" on the items table and if I run this code Item item=new Item(); Site site=new Site(); item.setSite(site); manager.persist(site); manager.persist(item); I find that the "items" table contains a record, and it is mapped to the new record I can find on the "sites" table. The problem is that if I check the value for site.getItems() after the persist operation I get a null value. It seems that the opposite "relationship" is not set properly. I get a problem even if I don't persist the site before the item and I can't understand why...isn't Hibernate supposed to persist automatically the site entity by itself? Maybe I'm using badly the annotation, please help me!!! Can some of you explain me if it's possible with Hibernate to define a many-to-many relationship with some relationship attributes and a many- to-one relationship that connects an entity with itself (in order to build a tree)? Thank you in advance for your help Cold View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4016999#4016999 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4016999 _______________________________________________ jboss-user mailing list jboss-user@lists.jboss.org https://lists.jboss.org/mailman/listinfo/jboss-user