[forge-dev] Problem with beanManager.getReference(InjectionPoint, CreationalContext)

[Jozef Hartinger]

Hi Lincoln,

can you provide a stack trace? I tried reproducing as described but I 
only see a NPE being thrown from Maven so I assume I am observing 
something else. What you do should work. Please file a Weld issue.

Btw, is there a reason why you need to "fake" the InjectionPoint?. Since 
you have a Bean object and a CreationalContext object available in your 
code you can obtain a contextual reference using the 
BeanManager.getReference() method without faking the IP.

JH

On 01/11/2013 11:27 PM, Lincoln Baxter, III wrote:
> Hey all,
>
> I have a problem with "Faking an injection point," with the current 
> Weld 2 code, seems to be throwing an NPE instead of using the 
> InjectionPoint that I am providing the BeanManager with.
>
> This can be reproduced right now by checking out the forge core 
> repository branch 2.0. Just run, mvn clean install.
>
> https://github.com/forge/core/tree/2.0
>
> The crux of the matter, we have a producer method in a CDI instance A:
>
> @Produces
> public static Coverter<?,?> produceRemoteConverter(AddonRegistry 
> registry, InjectionPoint ip)
>
> There are, however, no injection points actually consuming this 
> type/producer method from within CDI instance A. (And adding one would 
> not really help.)
>
> In CDI instance, B, however, we are using the following code, with a 
> reference to the BeanManager from CDI instance A, to get an instance 
> of a Converter:
>
> Bean<R> bean = (Bean<R>) manager.resolve(manager.getBeans(type));
> context = manager.createCreationalContext(bean);
> Object delegate = manager.getInjectableReference(injectionPoint, context);
>
> We have an InjectionPoint for the Converter type in CDI instance B, 
> and are delegating to container A to get the instance (using an 
> extension.)
>
> However, even though we are passing in our own InjectionPoint(B) into 
> CDI instance A, CDI instance A still tries to look up the 
> InjectionPoint on its internal stack, and throws a NullpointerException.
>
> I think this is a bug, since InjectionPoint is an interface, (but 
> obviously very edge case if so.)
>
> Any help would be appreciated. Otherwise, we have no way to support 
> looking up beans for types which are produced with Producer Methods 
> requiring an injection point (those without work fine, and normal type 
> lookups obviously work fine.)
>
> -- 
> Lincoln Baxter, III
> http://ocpsoft.org
> "Simpler is better."

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