Hi,

I'm not sure whether this is the right place to post this question, but I'm not sure either if the problem I have comes from Hibernate or from Seam Conversations.

I am using seam 1.2.1.GA and hibernate 3.2. In my application, data is updated quite frequently by many concurrent clients. Scenario is very simple. Two pages: one to show items, one to edit an item's properties.

My item entity is defined as such:

@Entity
| @Name("item")
| @Table(name="item")
| public class MItem implements Serializable {
|
|   @ManyToMany
|   @org.hibernate.annotations.Fetch(FetchMode.SUBSELECT)
|   @Cascade({
|      CascadeType.SAVE_UPDATE,
|      CascadeType.MERGE,
|      CascadeType.PERSIST})
|   @JoinTable(
|   name = "item_prop",
|   joinColumns = {@(protected)")},
|   inverseJoinColumns = {@(protected)")})
|   private Set<MProperty> properties = new HashSet<MProperty>();
|
|   [...]
| }

and the property class:


| @Entity
| @Name("property")
| @Table(name="property")
| public class MProperty implements Serializable {
|
|   @ManyToMany(mappedBy = "properties")
|   private Set<MItem>items = new HashSet<MItem>();
|
|   @Column(name = "pr_value")
|   private String value;
|
| [...]
| }

The conversation spans from the item list page to the edit item (join) and is never ended (not even after saving the changes to the item properties).

If from Client A I update one of the properties of an item I can see my changes in the item list (even without ending the conversation upon persisting) but if from Client B I query the DB I can not see changes done to that property until I logout and login again (or simply when the http session is ended).

On the contrary, when I create a new item I can see changes on both clients.

I was not sure weather this was related to the second-level cache of hibernate, which I now disabled but this didn't give any significant results.

The only solution I found so far is to execute an em.refresh(item) on each item of the list before showing it, which works but has a terrible effect on performances!

Annotating queries with hints does not work either, does somebody have a good solution for this problem?

Thank you!


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