[weld-dev] How to avoid classes being picked as managed beans?

[Jason Porter]

On Wed, Mar 9, 2011 at 09:03, aalmiray <aalmiray at yahoo.com> wrote:
> Hello guys. I'm new to Weld and CDI, perhaps the subject of this message is a
> bit obvious to some of you but for the life of me couldn't find a portable
> solution to the following problem: Weld will pick up all classes of an
> application (found in a single jar that contains an empty beans.xml file),
> however I would like the container to cherry pick a set of classes based on
> some criteria (package name, class name convention, annotation, etc).
>
> I've seen that Weld has an extension (non-standard) that allows classes to
> be annotated with @Veto. It works fine but it poses to additional problems:
> - @Veto is Weld specific

The annotation is specific to Weld (hopefully will make it into the
CDI 1.1 spec), but the way it works is not.

> - you must annotate each class explicitly, which causes trouble with some
> classes I have in my app as they are Groovy scripts, thus I can't annotated
> them (Groovy script do get compiled to class files but you don't actually
> 'see' the class definition, it is generated by the compiler, thus the
> annotation could only be added by a compiler plugin that rewrites the
> generated AST (yes, it can be done but it's a heck of a Yak shaving at this
> point)).
>
> So, is there a way to specify which classes should be included/excluded in a
> more generic, standard way?

You could create an extension (which is what @Veto uses) to veto a
class from being picked up at deploy time. See
https://github.com/seam/solder/blob/master/impl/src/main/java/org/jboss/seam/solder/core/CoreExtension.java
for a possible implementation.

You could also create a class without a zero-arg constructor, or
create a final class.

> TIA.
> Andres
>
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-- 
Jason Porter
http://lightguard-jp.blogspot.com
http://twitter.com/lightguardjp

Software Engineer
Open Source Advocate
Author of Seam Catch - Next Generation Java Exception Handling

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