[hibernate-dev] ManagedBeanRegistry - dependency injection support

Yoann Rodiere yoann at hibernate.org
Thu Dec 14 03:53:48 EST 2017

Same here, compositions don't seem to be a reasonable use case. And even if
users provide a custom bean registry, they could just implement their
specific behavior for a few specific case, then retrieve another
implementations on their own and delegate to it however they want.
Overriding the service initiator looks like a very reasonable way to do

Regarding the package, "org.hibernate.resource.beans" seems more
appropriate to me, since CDI is not the only implementation we will get and
we know it. Also, if I wanted to nitpick, injection is not really something
the bean registry must provide. We could imagine a bean registry without
any support for injection, after all, just providing "monolithic beans". It
would still make sense with respect to your ManagedBeanRegistry API.

Yoann Rodière
Hibernate NoORM Team
yoann at hibernate.org

On 14 December 2017 at 08:01, Christian Beikov <christian.beikov at gmail.com>

> I don't think someone is actually going to use more than a single DI
> framework and even if they do, they will probably bridge one way or
> another between the DI frameworks to be able to access beans from one in
> the other.
> So I don't think we should do "compositions" since it's not a big deal
> to integrate different DIs and is also IMO an edge case. I'd prefer the
> package name `org.hibernate.resource.di` since CDI seems to be just one
> of the possible "integrations".
> Mit freundlichen Grüßen,
> ------------------------------------------------------------------------
> *Christian Beikov*
> Am 13.12.2017 um 21:04 schrieb Steve Ebersole:
> > https://hibernate.atlassian.net/browse/HHH-11259 and friends are mainly
> > about back porting the work I did on 6.0 for the ManagedBeanRegistry
> > abstraction over dependency injection containers.  We will ship support
> for
> > CDI as well as non-managed beans (things we directly instantiate).  Of
> > course we'd ideally make it easy to plug in other DI containers such as
> > Spring.  So I wanted to discuss the configuration of this support.
> >
> > The first thing to consider is whether we want to support using multiple
> DI
> > containers simultaneously.  E.g. is it conceivable that an application
> > might want to use both CDI and Spring simultaneously?  I started building
> > in support for that via a CompositeManagedBeanRegistry implementation,
> but
> > stepping back I want to gauge whether that is "reasonable" before
> > continuing down that path
> >
> > Assuming that we do want to support such "compositions" the next question
> > is how we see this being configured.  Clearly any time a CDI BeanManager
> is
> > present during bootstrap we want to enable CDI ManagedBeanRegistry
> > support.  How would users indicate additional ManagedBeanRegistry impls
> be
> > added to the CompositeManagedBeanRegistry?  I have opinions about this,
> but
> > I'd like to hear other's thoughts...
> >
> > Note that ManagedBeanRegistry is a service and is initiated
> > via org.hibernate.resource.cdi.spi.ManagedBeanRegistryInitiator.  So it
> > would be possible to completely redefine ManagedBeanRegistry support
> simply
> > by replacing that initiator.
> >
> > A minor point... notice that the package name here is
> > `org.hibernate.resource.cdi`, even though one of the goals here is to
> > support non-CDI ManagedBeanRegistry impls.  Do we want to use a different
> > package name?  Maybe `org.hibernate.resource.beans`?
> >   ``org.hibernate.resource.di`?  ``org.hibernate.resource.injection`?
> > Other suggestions?  I'm actually ok with `org.hibernate.resource.cdi` -
> imo
> > "cdi" conveys the proper intent.  But if others feel strongly it should
> be
> > something else, I am open to hearing what and why.
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