4:01 p.m.
Hi,
On Thu, Nov 20, 2014 at 9:42 PM, Jozef Hartinger <jharting(a)redhat.com> wrote:
The simplest thing you can do is:
Bean<InjectionPoint> bean = (Bean<InjectionPoint>)
manager.resolve(manager.getBeans(InjectionPoint.class));
InjectionPoint ip = (InjectionPoint) manager.getReference(bean,
InjectionPoint.class, manager.createCreationalContext(bean));
That's exactly what I initially started with ;) It works perfectly on
Weld, but unfortunately doesn't work on OWB (I tried 1.5.0).
There's the following exception thrown with that code:
java.lang.NullPointerException
at
org.apache.webbeans.portable.InjectionPointProducer.produce(InjectionPointProducer.java:59)
at
org.apache.webbeans.portable.InjectionPointProducer.produce(InjectionPointProducer.java:43)
at org.apache.webbeans.portable.AbstractProducer.produce(AbstractProducer.java:195)
at org.apache.webbeans.component.AbstractOwbBean.create(AbstractOwbBean.java:126)
at org.apache.webbeans.context.DependentContext.getInstance(DependentContext.java:68)
at org.apache.webbeans.context.AbstractContext.get(AbstractContext.java:124)
at
org.apache.webbeans.container.BeanManagerImpl.getReference(BeanManagerImpl.java:756)
at
org.apache.webbeans.container.InjectableBeanManager.getReference(InjectableBeanManager.java:165)
It tries to execute the following code, where "first" turns up to be null:
// the first injection point on the stack is of type InjectionPoint,
so we need the second one
CreationalContextImpl<InjectionPoint> creationalContextImpl =
(CreationalContextImpl<InjectionPoint>)creationalContext;
InjectionPoint first = creationalContextImpl.removeInjectionPoint();
if (!InjectionPoint.class.isAssignableFrom(ClassUtil.getClass(first.getType())))
I tried some variants on the above, like using the existing
creationalContext in the manager.getReference call instead of creating
a new one via manager.createCreationalContext(bean), but that too
didn't work (throws java.lang.IllegalStateException: Inconsistent
injection point stack).
Kind regards,
Arjan Tijms
On 11/19/2014 05:06 PM, arjan tijms wrote:
>
> Hi,
>
> In a producer method it's trivial to get access to an InjectionPoint
> instance representing the point where the value produced by the
> producer will be injected.
>
> When registering a Bean manually from an extension using
> AfterBeanDiscovery#addBean, this is not immediately obvious.
>
> After some fumbling with the CDI APIs I came up with the following
> code that seems to work on both Weld and OWB (didn't test CanDI yet).
>
> It uses a small "dummy" class, which is used to grab an InjectionPoint
> off:
>
> In a Bean:
>
> public Object create(CreationalContext<Object> creationalContext) {
>
> InjectionPoint injectionPoint = (InjectionPoint)
> beanManager.getInjectableReference(
> resolve(beanManager,
> InjectionPointGenerator.class).getInjectionPoints().iterator().next(),
> creationalContext
> );
>
> With InjectionPointGenerator being the following class:
>
> public class InjectionPointGenerator {
> @Inject
> private InjectionPoint injectionPoint;
> }
>
> And resolve being the following method:
>
> public static <T> Bean<T> resolve(BeanManager beanManager,
Class<T>
> beanClass) {
> Set<Bean<?>> beans = beanManager.getBeans(beanClass);
>
> for (Bean<?> bean : beans) {
> if (bean.getBeanClass() == beanClass) {
> return (Bean<T>)
> beanManager.resolve(Collections.<Bean<?>>singleton(bean));
> }
> }
>
> return (Bean<T>) beanManager.resolve(beans);
> }
>
> As mentioned, while this seems to work, I wonder if it's the best
> approach.
>
> Kind regards,
> Arjan
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