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From Reinhard Poetz <>
Subject Re: Trunk broken?
Date Wed, 27 Dec 2006 18:05:08 GMT
Carsten Ziegeler wrote:
> Joerg Heinicke wrote:
>> On 27.12.2006 13:48, Reinhard Poetz wrote:
>>> Does anybody else see this error message when he tries to use the latest 
>>> snapshot from trunk?
>>> java.lang.NullPointerException
>>>     at 
>>> org.apache.cocoon.core.container.spring.avalon.PoolableProxyHandler.invoke(

>>> Line 50 of the PoolableProxyHandler is
>>> RequestContextHolder.getRequestAttributes().removeAttribute(this.attributeName,

>>> RequestAttributes.SCOPE_REQUEST);
>> Don't know about Cocoon trunk yet, but if RequestContextHolder is the 
>> one delivered with Spring you need a component setting the 
>> RequestAttributes on the RequestContextHolder. Therefore you can use 
>> RequestContextListener or RequestContextFilter and declare it in web.xml.
> Exactly :)
> I removed our own implementation in favour of Spring's
> RequestContextHolder. The attributes are used to keep track of poolable
> components and to release them when the request is finished.
> Therefore you should add the Spring's request context listener to your
> web.xml (I added it to web.xml in svn); this listener requires servlet
> spec 2.4.

Thanks Carsten and Jörg! After adding the 
org.springframework.web.filter.RequestContextFilter, the reloading classloader 
(works like the shielded cl) works for me again.

For some reasons the use of the 
org.springframework.web.context.request.RequestContextListener caused this 

java.lang.IllegalStateException: No thread-bound request found: Are you 
referring to request attributes outside of an actual web request? If you are 
actually operating within a web request and still receive this message,your code 
is probably running outside of DispatcherServlet/DispatcherPortlet: In this 
case, use RequestContextListener or RequestContextFilter to expose the current 

Don't know what's wrong here, but I won't investigate further because together 
with the manipulation of the classloading mechanism like the reloading 
classloader does, things are often difficult to debug at that level.

Reinhard Pötz           Independent Consultant, Trainer & (IT)-Coach 

{Software Engineering, Open Source, Web Applications, Apache Cocoon}


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