What's new in Hibernate 4?

I just saw that a beta of Hibernate 4 was released. What's new in 4 compared to 3(.6)? I couldn't find this info in the beta announcement, nor when Googling the title of this question.

I can't paste the answers here because I don't have enough reputation points to add more than two links in the answer (I really need spend more time on this site) :(

So, I wrote a blog post. Please go there and find the answers. Sorry for the inconvenience.

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EDIT: Quoted from http://in.relation.to/Bloggers/WhatsNewInHibernateCore40. > #What's new in Hibernate Core 4.0 > > I saw someone is asking "what new in Hibernate Core 4.0", so I take > sometime and try to summary it here. first of all, please see: > > * The migration guide for 4.0 > * JIRA filter link which lists all *improvements- and new features in Hibernate Core 4.0.0, you can get all details from this link :) > > Some highlights: > > * Move to gradle for builds > * Redesign SessionFactory building > * Introduction of services (see this for more details) > * Improved metamodel (not in 4.0.0.Final yet, we planned this, but due to the tasks are more than we expected, and it would take too long > to get 4.0 out, so we decided to move this out of 4.0.0.Final but will > be upcoming release soon see this for more details, and this is a > design document) > * Initial osgi-fication by package splitting (public, internal, spi) > * Support for multi-tenant databases (see this for more details) > * Migration to i18n logging framework (using jboss logging) > * JDK 1.6 (JDBC4) as baseline > * and more (I can't remember all the things :)

It appears that most of what you want are in the migration guide for 4.0, as well as the blog post on alpha 1 release, and perhaps the Hibernate 4 webinar.

New features that are introduced in Hibernate core 4.0 releases are as follows:

• Provide support for initial multi-tenancy

• Introduces a ServiceRegistry.

• Clean up of Session opening from SessionFactory.

• Using org.hibernate.integrator.spi.Integrator made integration and auto discovery more desirable.

• Improve to work with i18n and message codes.

• Clean up of deprecated interfaces, methods, etc.

Don't know if this will benefit you, but I found some information on the Hibernate 4 Webinar page. In a linked doc they also gave some links. I have not had a look at them, but maybe give them a go:

http://community.jboss.org/wiki/Hibernate4Webinar

http://community.jboss.org/wiki/HibernateCoreMigrationGuide40

https://lists.jboss.org/mailman/listinfo/hibernate-dev

http://www.hibernate.org/community/irc