[weld-issues] [JBoss JIRA] Commented: (WELD-870) Add injection point information to exception message when injection into observer fails

[Dan Allen (JIRA)]

    [ https://issues.jboss.org/browse/WELD-870?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12588795#comment-12588795 ] 

Dan Allen commented on WELD-870:
--------------------------------

It appears that injection points on observer method arguments are not validated on startup. That is part of the issue (I'm assuming that should be just as strict as any other injection).

> Add injection point information to exception message when injection into observer fails
> ---------------------------------------------------------------------------------------
>
>                 Key: WELD-870
>                 URL: https://issues.jboss.org/browse/WELD-870
>             Project: Weld
>          Issue Type: Enhancement
>          Components: Events
>    Affects Versions: 1.1.0.Final
>            Reporter: Dan Allen
>
> Injections that fail when an observer method is invoked are massively hard to track down. Here's the information you get:
> org.jboss.weld.exceptions.IllegalArgumentException: WELD-001324 Argument bean must not be null
>    at org.jboss.weld.manager.BeanManagerImpl.getReference(BeanManagerImpl.java:714)
>    at org.jboss.seam.exception.control.HandlerMethodImpl.notify(HandlerMethodImpl.java:187)
>    at org.jboss.seam.exception.control.ExceptionHandlerDispatch.executeHandlers(ExceptionHandlerDispatch.java:128)
>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>    at java.lang.reflect.Method.invoke(Method.java:616)
>    at org.jboss.weld.util.reflection.SecureReflections$13.work(SecureReflections.java:305)
>    at org.jboss.weld.util.reflection.SecureReflectionAccess.run(SecureReflectionAccess.java:54)
>    at org.jboss.weld.util.reflection.SecureReflectionAccess.runAsInvocation(SecureReflectionAccess.java:163)
>    at org.jboss.weld.util.reflection.SecureReflections.invoke(SecureReflections.java:299)
>    at org.jboss.weld.introspector.jlr.WeldMethodImpl.invokeOnInstance(WeldMethodImpl.java:188)
>    at org.jboss.weld.introspector.ForwardingWeldMethod.invokeOnInstance(ForwardingWeldMethod.java:59)
>    at org.jboss.weld.injection.MethodInjectionPoint.invokeOnInstanceWithSpecialValue(MethodInjectionPoint.java:198)
>    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:270)
>    at org.jboss.weld.event.ObserverMethodImpl.sendEvent(ObserverMethodImpl.java:253)
>    at org.jboss.weld.event.ObserverMethodImpl.notify(ObserverMethodImpl.java:222)
>    at org.jboss.weld.manager.BeanManagerImpl.notifyObservers(BeanManagerImpl.java:632)
>    at org.jboss.weld.manager.BeanManagerImpl.fireEvent(BeanManagerImpl.java:619)
>    at org.jboss.weld.manager.BeanManagerImpl.fireEvent(BeanManagerImpl.java:613)
> I expect to see the type and qualifiers at the failing injection point. 

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