Tis the season to Hibernate after all

Hibernate Core 4.0 released

Chris Mayer
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Rotten to the core, certainly not! Multi-tenancy support and introduction of ServiceRegistry API the main draws for Hibernate 4

Just about making the last delivery before Christmas, the
Hibernate team have announced with glee that the final version of
their ORM Framework Hibernate
Core 4.0
is now available, promising a whole list of major
improvements.

The JBoss popular persistence engine, that maps Java
classes to databases primarily, has always been known for pushing
the envelope further in terms of innovation. 
Originally
the team planned to implement a redesign of the
Hibernate metamodel (
org.hibernate.mapping)
but instead opted to bolster Hibernate Core 4 with a host of
enhancements such as adding multi-tenancy support and a new service
management system called SystemRegistry.

Through Hibernate Core, developers can now create
multi-tenancies through three methods, as detailed in Steve
Ebersole’s blog post
.

  1. Separate database
    instances
    – This approach gives each tenant their own
    physical database instance.
  2. Separate schemas
    This approach uses the same physical database instance for all the
    tenants, but each gets its own schema (or catalog) within that
    instance.
  3. Partitioning
    This approach uses the same database instance and same schema. In
    other words a single table holds the data for every tenant. The
    tenants are partitioned by some form of
    discriminator value.

For those slightly hesistant over the methods, the team provided
a
helpful Q&A
to iron out any multi-tenancy design
issues.

Another brand new features is the ServiceRegistry API, a
fundamental shift in how Hibernate builds and
manages 
services. From now on, services
are managed in a hierarchical registries making things much more
cohesive. Improved Logging in with i18n support and message codes
have also been implemented in the full release. Work has also begun
to make a much clearer split between API, SPI and
implementation classes.

The Hibernate team have also been in full spring cleaning mode
(a tad bit early), cleaning out unneccessary deprecated classes and
methods.

But what does the future hold for Hibernate Core? The team also
announced simultaneously the release of 3.6.9 but
they say that 4.1 should be out in the new year, complete with a
new API for performing natural key lockups and an improved cascade
performance. Not to mention the tidying up of Documentation
paperwork, currently laying in four pieces – Getting
Started Guide
, Reference
Documentation
, Developers
Guide
 and EntityManager
User Guide
. The artifacts for Core 4 are available in the

JBoss repository
 

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