Envers future...

[dyahav]

Hi,
I'm considering to adopt the Envers mechanism for my application and I want to know what is the road map for this great project.
Are the full three inheritance strategies going to be supported?
Thanks!!
dyahav

[adamw]

Hello,

yes, certainly.
The 1.1 release will cover persistent collections.
The 1.2 release will cover inheritance.
Right now, the single-table strategy works. User morman reported some problems with the joined strategy: http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4175511#4175511. But I hope that the problems will be possible to overcome :).

I don't think there's a JIRA issue for that, so please create it :).

--
Adam

[morman]

"adamw" wrote:
I don't think there's a JIRA issue for that, so please create it :).

Create JIRA for unsupported joined-inheritance strategy? :)

Could you estimate time when 1.1, 1.2 releases will be released? :)

[adamw]

Hello,

yes, for the joined and table-per-class strategy. (You can attach a patch there also, if you have one ready ;) )

The releases are visible also in JIRA; I'd like to release 1.1.ga in the beginning of october and 1.2.beta1 towards the end. But these are just estimation, it can be sooner or later :).

Adam

[supernovasoftware.com]

I almost jumped for joy when I saw this project. However, my application relies heavily on joined and table-per-class strategy.

What is the status of these items?

I am posting a ref to this project on the Seam list because I read all the posts there and have never seen one for this.

[adamw]

Well, they're first on the list for being developed, but I'm short of time currently, so ... whenever I have time or when someone contributes a patch for this :)

Adam

[adamw]

Hello,

it turned out that adding support for table-per-class inheritance is easy, so I added that to trunk.

"joined" can pose some difficulties however.

--
Adam

[adamw]

Hello,

I got some time this weekend and it turned out that joined wasn't that hard, I had almost all of the code written ;) It's in trunk, and if you've got time, please test :).

--
Adam

[dave_lilley]

Where can I download the table-per-class / joined version? I searched, checked out your blog, and looked here: http://www.jboss.org/envers/downloads/

Thanks,
Dave

[dave_lilley]

Never mind. I found the source trunk. Thanks.

[adamw]

Hello,

on http://www.jboss.org/envers/ you'll also find an uploaded jar of the hibernate-envers module (should work fine with Hibernate 3.3)

--
Adam

[dave_lilley]

I am running on Jboss 4.2.3, Seam, 2.1, and Hibernate 3.3, with table-per-class and joined mapping I going to try your preview version now.

Thank Adam!

[adamw]

Ok, hope it will work well :)

--
Adam

[dave_lilley]

Adam,

I found one thing I don't quite understand. I have a MappedSuperClass, which is subclassed by several entities. The MappedSuperClass has an embeddable object set, defined by @CollectionOfElements and @JoinTable.

@MappedSuperclass
public abstract class AbstractSystemEntity {
...
@CollectionOfElements
@JoinTable(name="systemcomponent", joincolumns = @JoinColumn(name="system_id"))
private Set components;
...
}

@Embeddable
public class ComponentObject implements Serializable{
...
}


After reading the docs and some trial and error, I assume that under the current Envers (preview), that I need to promote the object to and entiry and change the annotations to @OneToMany and @AuditJoinTable.

Is this correct?

Dave

[dave_lilley]

More info... I converted the embeddable to an entity, and switch to @OneToMany and used @AuditJoinTable, but then I get an exception from Envers...

Caused by: org.hibernate.HibernateException: could not init listeners
at org.hibernate.event.EventListeners.initializeListeners(EventListeners.java:205)
at org.hibernate.cfg.Configuration.getInitializedEventListeners(Configuration.java:1338)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1327)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:854)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
... 164 more
Caused by: java.lang.NullPointerException
at org.hibernate.envers.configuration.metadata.CollectionMetadataGenerator.addValueToMiddleTable(CollectionMetadataGenerator.java:380)
at org.hibernate.envers.configuration.metadata.CollectionMetadataGenerator.addWithMiddleTable(CollectionMetadataGenerator.java:303)
at org.hibernate.envers.configuration.metadata.CollectionMetadataGenerator.addCollection(CollectionMetadataGenerator.java:152)
at org.hibernate.envers.configuration.metadata.AuditMetadataGenerator.addValue(AuditMetadataGenerator.java:136)
at org.hibernate.envers.configuration.metadata.AuditMetadataGenerator.addProperties(AuditMetadataGenerator.java:155)
at org.hibernate.envers.configuration.metadata.AuditMetadataGenerator.generateSecondPass(AuditMetadataGenerator.java:343)
at org.hibernate.envers.configuration.EntitiesConfigurator.configure(EntitiesConfigurator.java:96)
at org.hibernate.envers.configuration.AuditConfiguration.(AuditConfiguration.java:86)
at org.hibernate.envers.configuration.AuditConfiguration.getFor(AuditConfiguration.java:99)
at org.hibernate.envers.event.AuditEventListener.initialize(AuditEventListener.java:232)
at org.hibernate.event.EventListeners$1.processListener(EventListeners.java:198)
at org.hibernate.event.EventListeners.processListeners(EventListeners.java:181)
at org.hibernate.event.EventListeners.initializeListeners(EventListeners.java:1
94)
... 168 more