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From Claus Ibsen <claus.ib...@gmail.com>
Subject Re: Camel 2.0 - OSGi - loading classes
Date Tue, 03 Mar 2009 13:36:42 GMT
On Tue, Mar 3, 2009 at 2:26 PM, Willem Jiang <willem.jiang@gmail.com> wrote:
> Hi Claus
>
> If the ThreadContextClassLoader is the user's bundle's classloader, and
> the user bundle doesn't import the org.apache.camel.jms package.
> The ObjectHelper can't load the right DefaultQueueBrowseStrategy class
> by using the bundle's classlaoder.
Ah got it. So by changing to the JMS class we know its gonna find it
in camel-jms as its the same bundle as it self :)


>
> Willem
>
> Claus Ibsen wrote:
>> On Tue, Mar 3, 2009 at 2:03 PM, Willem Jiang <willem.jiang@gmail.com> wrote:
>>> Hi,
>>>
>>> I think we should leverage the ThreadContextClassLoader to load the
>>> right class.
>>> Since OSGI has elegant mechanism to get control of the class's version
>>> and handle the relationship of the classes. I don't want to walk around
>>> this mechanism by looking over all the bundler's context for a class.
>> But this was the problem with the JMS stuff. ObjectHelper.loadClass
>> will use the ThredContextClassLoader first.
>> So I can not see if that would work.
>>
>>> Just my 2 cents.
>>
>>> Willem.
>>>
>>> Claus Ibsen wrote:
>>>> Hi
>>>>
>>>> In Camel we use ObjectHelper.loadClass to load classes on the fly.
>>>>
>>>> Could there be some issues with this in OSGi platforms? We got a
>>>> report today with using camel-jms that tries to load a spring queue
>>>> browser class on the fly. So we can support Spring 2.0 also as this
>>>> class was introduced in Spring 2.5.x.
>>>>
>>>> I was wondering if we should add API for pluggable class resolvers?
>>>> Eg. ClassResolver API in SPI and then a getter to it from
>>>> CamelContext.
>>>> Or is the ObjectHelper sufficient?
>>>>
>>>> Do you need to get hold of some bundle context to load classes in OSGi
>>>> or is the regular class loading okay?
>>>>
>>>> Gertv, Willem you are the ones that are most into OSGi. You thoughts?
>>>>
>>>>
>>>
>>
>>
>>
>
>



-- 
Claus Ibsen
Apache Camel Committer

Open Source Integration: http://fusesource.com
Blog: http://davsclaus.blogspot.com/

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