How register envers 4 listeners in persistence.xml ?

[claudio4j]

Hi, Looking into envers 4 documentation at [1] it doesn't says the listeners to configure.

For envers 3.6. it says to register AuditEventListener which doesn't exist for envers 4.

Looking into envers 4 javadoc, I suppose the listeners to register are displayed as below

<property name="hibernate.ejb.event.post-insert"  value="org.hibernate.envers.event.EnversPostInsertEventListenerImpl"/>

<property name="hibernate.ejb.event.post-update" value="org.hibernate.envers.event.EnversPostUpdateEventListenerImpl"/>

<property name="hibernate.ejb.event.post-delete" value="org.hibernate.envers.event.EnversPostDeleteEventListenerImpl"/>

However, running it throws errors

Caused by: org.hibernate.service.classloading.spi.ClassLoadingException: Unable to load class [org.hibernate.ejb.event.EJB3PostUpdateEventListener,org.hibernate.envers.event.EnversPostUpdateEventListenerImpl]
    at org.hibernate.service.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:141)
    at org.hibernate.ejb.event.JpaIntegrator.instantiate(JpaIntegrator.java:257)
    ... 35 more
Caused by: java.lang.ClassNotFoundException: Could not load requested class : org.hibernate.ejb.event.EJB3PostUpdateEventListener,org.hibernate.envers.event.EnversPostUpdateEventListenerImpl

Looks like the comma is not recognized as an separator to multiple event listeners, if left only envers listeners, it throws.

Caused by: org.hibernate.HibernateException: Could not instantiate requested listener [org.hibernate.envers.event.EnversPostUpdateEventListenerImpl]
    at org.hibernate.ejb.event.JpaIntegrator.instantiate(JpaIntegrator.java:260)
    at org.hibernate.ejb.event.JpaIntegrator.integrate(JpaIntegrator.java:137)
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:295)
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1737)
    at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:76)
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:905)
    ... 30 more
Caused by: java.lang.InstantiationException: org.hibernate.envers.event.EnversPostUpdateEventListenerImpl

So I ask, what is the correct configuration to register envers 4 in persistence.xml ?

1. chap 15 http://docs.jboss.org/hibernate/core/4.0/devguide/en-US/html_single/#d0e4749

[adamw]

You only need the Envers jar on the classpath

The first sentence of 15.1:

"To audit changes that are performed on an entity, you only need two things: the hibernate-envers jar on the classpath and an @Audited annotation on the entity."

Maybe this can be somehow made more clear?

Adam

[claudio4j]

I have read the 3.6 envers documentation previously, and the listener configuration has a box that made easy to spot it in the page.

When I looked into envers 4 doc, I couldn't see it, as you noted.

Anyway I run my unit tests and entities annotated as envers doc suggests and there are other errors. Now I have a different question, but will open another thread.

Thanks Adam.

[adamw]

I added a note in the docs to clarify that.

Adam