[cdi-dev] Bean discovery question

Martin Kouba mkouba at redhat.com
Wed Mar 22 07:17:07 EDT 2017

Dne 20.3.2017 v 20:47 Laird Nelson napsal(a):
> On Mon, Mar 20, 2017 at 10:56 AM John Ament
> <john.ament at spartasystems.com <mailto:john.ament at spartasystems.com>> wrote:
>     For me, that still doesn't discover.  The only thing I can think of
>     is that the JAR that includes StringSearchModelInterpolator may have
>     a beans.xml (does it?)
> No.
> I spoke with John off-list; wanted to shed more light on my setup.
> I pushed a shaky incomplete version of what I'm doing
> here: https://github.com/ljnelson/microbean-maven-cdi/blob/master/src/main/java/org/microbean/maven/cdi/MavenExtension.java
> The purpose of this frightening :-) extension is uninteresting for the
> subject under discussion here.  Briefly, it does just enough Plexus
> annotation processing to be mildly dangerous and break things in cool
> ways, and no more.
> The test method is
> here: https://github.com/ljnelson/microbean-maven-cdi/blob/master/src/test/java/org/microbean/maven/cdi/TestMavenExtension.java#L65-L70
> Note in particular the main method is not in this project.  It is in
> this one, which is a test-scoped
> dependency: https://github.com/ljnelson/microbean-main/blob/master/src/main/java/org/microbean/main/Main.java#L125-L134
> That project's META-INF/beans.xml has bean discovery set to none
> (https://github.com/ljnelson/microbean-main/blob/master/src/main/resources/META-INF/beans.xml#L7),
> since there are no beans in that bean archive (it houses only the main
> class).  John indicated that this was likely the source of the problem:

I don't think this is the problem. In Weld SE bean archive isolation is 
enabled by default. Ie. for 
the beans.xml is 

> "Ok, knowing that this is the setup helps out dramatically.  If I had to
> guess, the case of having the beans.xml from the main set to none is
> what's causing this.  I remember Martin mentioned some issues with SE
> originally when I pushing [/sic/] that by default we should do
> discovery.  My guess is that Weld is seeing the beans.xml from the root
> component [microbean-main] and actually falling back to the CDI 1.0
> discovery behavior."
> This project's META-INF/beans.xml has bean discovery of "annotated"
> (https://github.com/ljnelson/microbean-maven-cdi/blob/master/src/main/resources/META-INF/beans.xml#L7),
> though I confess that's mostly because I just wanted to use the default
> behavior, not because I carefully considered whether that was something
> I should use here or not.  In any event, I don't anticipate there being
> any classes in this project with bean-defining annotations on them, nor
> any other classes that I would want discovered automatically.
> Perhaps I have misunderstood bean discovery: I thought that the
> discovery mode applied to the bean archive in question alone, not to an
> aggregate.

What do you mean with "aggregate"? Bean discovery mode is applied to a 
specific bean archive only.

> Best,
> Laird

Martin Kouba
Senior Software Engineer
Red Hat, Czech Republic

More information about the cdi-dev mailing list