Pete Muir commented on CDI-129:
But most old EE servers (JBoss4 and 5 are perfect examples for this, as are the old
WebLogics) ship with almost no isolation at all it seems! I actually never understood why
they behave this way as default!
Believe it or not, older versions of JBoss AS (than 4) did provide more isolation by
default, but by user request the isolation was downgraded. Also worth pointing out that
JBoss AS 4 and 5 did support much stronger isolation if you enabled it (we always
recommended you did with Seam, and enabled it automatically with Weld so I always forget
this was the default!).
@Marius: A Bean can only be used in a shared library if it's type is available on the
shared classpath too. E.g. in a ejb-jars lib. And even if one webapp uses an @Alternative
which is only available in this very one webapp, then there is no problem. Because
injecting an @ApplicationScoped bean will still give you the contextual reference (the
proxy). They simply refer to different contextual instances. There is really not much
difference to a @SessionScoped bean of which it's class is in a shared ejb-jars lib.
I'm a little lost in this sentence... What are you trying to say?
Jens/Marius, I think your point is a very reasonable one for the spec. Of course, we would
need an FAQ explaining the details of this ;-)
Mark, please take this comment to the EE expert group, as you know we can only decide on
CDI here ;-)
Gerhard, we all agree with this rhetoric here (no real need to repeat it), we just need to
find a solution that (a) makes sense technically and (b) works in the environment we are
in. What is proposed does make sense (to me) and does work technically except in the case
that people use non-isolated classloading, which EE keeps as an option for backwards
IOW what we have is a solution that makes sense with the recommended deployment model
(isolated classloading), but we need to include, in the spec, a note about non-portability
for the backwards compatible non-isolated classloading case.
introduce @EnterpriseScoped (or similar)
Project: CDI Specification Issues
Issue Type: Feature Request
Affects Versions: 1.0
Reporter: Mark Struberg
Fix For: 1.1 (Proposed)
Since @ApplicationScoped currently is defined in 6.5.2 as to be 'like in the Servlet
specification' this means that you will get a new instance for every WebApplication
There is currently no specified CDI scope for providing a single shared instance for a
We could (ab-)use @Singleton for that, but this is currently not well defined at all.
Alternatively we could introduce an own new annotation like @EnterpriseScoped or likes.
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