Hi,
i am new to this, so i apologize if this question is stupid...
have 2 entities with 1 to many relations:
@Entity
| @Table(name = "contents")
| public class Content implements Serializable
| {
| private Long id;
| private Integer version;
| ... some more simple fields
|
| private Collection lastTaggingCollection;
|
| @ManyToOne
| @JoinColumn(name = "last_tagging_collection", nullable = true)
| public Collection getLastTaggingCollection()
| {
| return lastTaggingCollection;
| }
|
| public void setLastTaggingCollection(Collection lastTaggingCollection)
| {
| this.lastTaggingCollection = lastTaggingCollection;
| }
|
| ... more methods
| }
|
| @Entity
| @Table(name = "cm_collections")
| public class Collection implements Serializable
| {
| private Long id;
| private Integer version;
| ... some more simple fields
|
| private List<Content> contents;
|
| @OneToMany(fetch = FetchType.LAZY, mappedBy = "lastTaggingCollection")
| @JoinColumn(name = "last_tagging_collection")
| public List<Content> getContents()
| {
| return contents;
| }
|
| public void setContents(List<Content> contents)
| {
| this.contents = contents;
| }
|
| ... more methods
| }
now, when i am inside a stateless session bean method with a transaction type =
required i try the following:
Collection collection = dao.findById( 1L );
| log.debug("fetchContacts() - caller: " + collection.getContents().size());
(the dao is injected using @EJB)
i get:
org.hibernate.LazyInitializationException: failed to lazily initialize a
collection of role: com.jinni.content.mgmt.model.Collection.contents, no
session or session was closed
but when i change the fetch type to eager all works...
???
any clue why?
what am i missing?
thanks
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