No it's not a CP : I don't have Weld in my app and I used JBoss 6 out of the
box.
It comes from the conjunction of using
@Inject
@Any
private Instance<OAuthServiceHandler> serviceHandlerInstances;
to build list of OAuthServiceHandler beans available. And
@Produces
@Named
@RequestScoped
public OAuthServiceHandler getCurrentServiceHdl()
{
return currentServiceHdl;
}
which creates a null OAuthServiceHandler bean. This Null bean goes into
serviceHandlerInstances and as my code is not secured yet against null Bean in
the Instance<> iterator I've got a NPE.
When this NPE is thrown in the @Postconstruct method it creates some kind of
stack overflow (trying to recreate the bean again and again after each
exception in @Postconstruct) and in the end, the system throws the strange
exception : "java.lang.NoClassDefFoundError:
org/jboss/weld/exceptions/WeldException"
Sot I've got the following question :
1) How can I avoid produce null bean (abort bean producing when the value
returned by producer method is null) ?
2) Is there a way to use @Any with a restriction (all qualifier except this
one)) ?
3) Shouldn't the exception be a bit more explicit on this issue ;-) ?
Thanks
Antoine SABOT-DURAND
Le 4 avr. 2011 à 22:22, Jason Porter a écrit :
> That looks to me like you're having CP issues. Do you have the weld jars in
> your archive as well as the app server?
>
> WRT the @Out question if you want the same kind of functionality you have to
> create a wrapper component and play the scope game with it that way
> (Conversation scoped wrapper with a setter for the actual instance).
>
> Hope that helps.
>
> Sent from my iPhone
>
> On Apr 4, 2011, at 15:42, Antoine Sabot-Durand <[email protected]>
> wrote:
>
>> Hi Dan and Team,
>>
>> Sorry to go back to this subject but I don't get the expected result from
>> @produces.
>> In Seam social Web client example, I tried to outject currentServiceHdl in
>> SocialClient bean like this :
>>
>> @Produces
>> @Named
>> public OAuthServiceHandler getCurrentServiceHdl()
>> {
>> return currentServiceHdl;
>> }
>>
>> and I get the following exception when Social client is initialized
>> (apparently in the @Postconstruct callback) from JSF call (notice that
>> currentServiceHdl is not in the JSF view that triggers the exception only
>> socilaClient) :
>>
>>
>> java.lang.NoClassDefFoundError: org/jboss/weld/exceptions/WeldException
>> at
>> org.jboss.weld.bean.AbstractClassBean.defaultPostConstruct(AbstractClassBean.java:595)
>> at
>> org.jboss.weld.bean.ManagedBean$ManagedBeanInjectionTarget.postConstruct(ManagedBean.java:200)
>> at org.jboss.weld.bean.ManagedBean.create(ManagedBean.java:340)
>> at org.jboss.weld.context.AbstractContext.get(AbstractContext.java:121)
>> at
>> org.jboss.weld.bean.proxy.ContextBeanInstance.getInstance(ContextBeanInstance.java:99)
>> at
>> org.jboss.weld.bean.proxy.ProxyMethodHandler.invoke(ProxyMethodHandler.java:87)
>> at
>> org.jboss.seam.social.example.webclient.org$jboss$weld$bean-jboss$classloader:id="vfs:$$$Users$antoine$Documents$Eclipse_workspaces$seam-social$$metadata$$plugins$org$jboss$ide$eclipse$as$core$JBoss_6$0_Runtime_Server1295753022377$deploy$seam-social-web-client$war"-ManagedBean-class_org$jboss$seam$social$example$webclient$SocialClient_$$_WeldClientProxy.getServiceHandlers(org$jboss$weld$bean-jboss$classloader:id="vfs:$$$Users$antoine$Documents$Eclipse_workspaces$seam-social$$metadata$$plugins$org$jboss$ide$eclipse$as$core$JBoss_6$0_Runtime_Server1295753022377$deploy$seam-social-web-client$war"-ManagedBean-class_org$jboss$seam$social$example$webclient$SocialClient_$$_WeldClientProxy.java)
>> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>>
>> removing @Produces @Named make the exception disappears.
>>
>> Any clue ?
>>
>> Antoine SABOT-DURAND
>>
>>
>> Le 16 mars 2011 à 23:09, Antoine Sabot-Durand a écrit :
>>
>>> Thanks for the douse I'm going to test this right away.
>>>
>>> Antoine Sabot-Durand
>>>
>>> Le 16 mars 2011 à 18:29, Dan Allen <[email protected]> a écrit :
>>>
>>>> You can create a producer that aliases a name to a property, like this:
>>>>
>>>> @Produces @Named
>>>> public Hotel getHotel() { return booking.getHotel(); }
>>>>
>>>> #{hotel}
>>>>
>>>> You can also use a producer field, like so:
>>>>
>>>> @Produces @Named
>>>> private Hotel hotel;
>>>>
>>>> #{hotel}
>>>>
>>>> Produces sort of turns outjection on it's head. But if you think about it,
>>>> it's a better way to go about it because it's more robust to read the
>>>> state of the model as it is, then try to shift the information around into
>>>> variables from which to read them, as outjection did.
>>>>
>>>> What you can't do is use the same variable name to refer to state on two
>>>> different models, unless of course your producer method does some
>>>> conditional logic (saying if this screen, give this result, if this
>>>> screen, give a different result). But again, that's a good thing because
>>>> then tooling can actually tell you where the data is coming from.
>>>>
>>>> This is a key topic for the migration guide. Feel free to contribute
>>>> examples of how you might solve an outjection scenario with produces. It's
>>>> a good exercise anyway.
>>>>
>>>> -Dan
>>>>
>>>> On Wed, Mar 16, 2011 at 13:03, Ken Finnigan <[email protected]> wrote:
>>>> If you want the result of @Produces to be EL accessible just throw a
>>>> @Named on it.
>>>>
>>>> Ken
>>>>
>>>> Sent from my iPhone
>>>>
>>>> On Mar 16, 2011, at 13:02, Antoine Sabot-Durand <[email protected]>
>>>> wrote:
>>>>
>>>>> For what I understand, it's not quite the same. I think it's more like
>>>>> @Factory, but I agree it's nearly the same and I could use it was
>>>>> possible to "Named" the "outjected" property in order to use it in EL...
>>>>>
>>>>> Antoine
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Le 16 mars 2011 à 17:54, Ken Finnigan a écrit :
>>>>>
>>>>>> Antoine,
>>>>>>
>>>>>> I'm pretty sure the equivalent for CDI is to use @Produces.
>>>>>>
>>>>>> Ken
>>>>>>
>>>>>>
>>>>>> On Wed, Mar 16, 2011 at 12:47 PM, Antoine Sabot-Durand
>>>>>> <[email protected]> wrote:
>>>>>> Hi all,
>>>>>>
>>>>>> I try to shorten my Expression language code and don't want to create
>>>>>> delegate methods in my controller to access propertir of a business
>>>>>> component.
>>>>>>
>>>>>> I didn't found something like @Out. Does it exists ?
>>>>>>
>>>>>> Thanks,
>>>>>>
>>>>>> Antoine
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> seam-dev mailing list
>>>>>> [email protected]
>>>>>> https://lists.jboss.org/mailman/listinfo/seam-dev
>>>>>>
>>>>>
>>>>
>>>> _______________________________________________
>>>> seam-dev mailing list
>>>> [email protected]
>>>> https://lists.jboss.org/mailman/listinfo/seam-dev
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Dan Allen
>>>> Principal Software Engineer, Red Hat | Author of Seam in Action
>>>> Registered Linux User #231597
>>>>
>>>> http://www.google.com/profiles/dan.j.allen#about
>>>> http://mojavelinux.com
>>>> http://mojavelinux.com/seaminaction
>>>>
>>
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