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From David Jencks <>
Subject Re: help! gbean ref doesn't contain added interfaces
Date Sat, 02 Dec 2006 08:59:51 GMT
I might be misunderstanding what you are trying to do....

When you have a gbean reference, you have to declare the interface  
you are going to use in the GBeanReferenceInfo you set up in that  
static block of code.  You'll get a proxy implementing exactly that  
interface and nothing else AFAIK.  So if you want to use 2 interfaces  
that a gbean implements, and neither extends the other, you need 2  

You might be able to declare the "interface" to be the gbean  class  
itself (as long as it has a no-arg constructor) and then you should  
get a proxy implementing everything in the gbean itself.  Be sure not  
to have any public final methods in the gbean if you do this.

Hope this helps
david jencks

On Dec 1, 2006, at 7:31 PM, Sachin Patel wrote:

> Yep, the GBean does implement the interface, and the GBean isn't a  
> new GBean, I just modified an existing GBean with an additional  
> interface.
> On Dec 1, 2006, at 5:18 PM, Aaron Mulder wrote:
>> Are you sure the GBean in question actually implements the interface?
>> And that the module builder you're interacting with is definitely
>> using the implementation class you think it is?  (Maybe you copy and
>> pasted the GBeanInfo block from old to new GBean and it's  
>> referring to
>> the old class instead of the new class in the GBeanInfo in the new
>> class?)
>> Thanks,
>>      Aaron
>> On 12/1/06, Sachin Patel <> wrote:
>>> Thanks Aaron.. see inline.
>>> On Dec 1, 2006, at 4:20 PM, Aaron Mulder wrote:
>>> So what you get back is ordinarily a proxy to the actual  
>>> service.  If
>>> you get the abstract name for the returned module builder (the  
>>> kernel
>>> has a call to do that) and then get a fresh proxy to it (from the
>>> proxy manager from the kernel), does it include your new interface?
>>> Yes, creating a fresh proxy includes the new interface, but  
>>> unfortunately
>>> that only gets me passed the class cast, as it throws an  
>>> exception "No
>>> implementation method" when calling a method on the interface.  :(
>>> If so, it suggests that the proxies generated for the reference
>>> include only the interfaces that match the reference type.
>>> Thats what I assumed, but if I changed the reference type to the new
>>> interface, then for some reason getWebConfigBuilder() returns  
>>> null, so
>>> something was still expecting the referenceType for the builders  
>>> to be
>>> ModuleBuilder.class.
>>> If not, it
>>> may be that the class loader that's provided to create the proxy
>>> doesn't include the added interface (though there used to be a  
>>> warning
>>> emitted every time this happened).
>>> I'm not sure what could be done to
>>> work around that -- maybe either add the interface to other  
>>> modules as
>>> needed or contrive to use the right module's class loader to create
>>> the proxy.
>>> Thanks,
>>>     Aaron
>>> On 12/1/06, Sachin Patel <> wrote:
>>> I'm having some trouble figuring out why I'm getting a  
>>> ClassCastException
>>> and would appreciate if someone could shed some light...
>>> In TomcatModuleBuilder I implement an "additional" interface  
>>> ModuleBuilder2
>>> as well as add..
>>> static {
>>> ...
>>>  infoBuilder.addInterface(ModuleBuilder2.class)
>>> ...
>>> }
>>> But then in EARConfigBuilder if I call...
>>> ((ModuleBuilder2) getWebConfigBuilder())
>>> I get a ClassCastException casting it to ModuleBuilder2 during  
>>> the building
>>> of the configs which I don't understand why.  If I inspect the  
>>> interfaces of
>>> getWebConfigBuilder() it only returns ModuleBuilder and
>>> GeronimoManagedGBean.  Why isn't ModuleBuilder2 being listed?
>>> I tried updated the referenceType for WebBuilder in  
>>> EARConfigBuilder from
>>> ModuleBuilder to ModuleBuilder2, but then in that case  
>>> getWebConfigBuilder
>>> ends up returning null.
>>> What am I missing? Why can't I add an additional interface to the
>>> TomcatModuleBuilder GBean?
>>> Thanks
>>> -sachin
>>> -sachin
> -sachin

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