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From Reinhard Poetz <reinh...@apache.org>
Subject Re: [2.2] Weird NPE when concurrency
Date Thu, 31 Jan 2008 20:41:25 GMT
Thorsten Scherler wrote:
> Hi all,
> 
> we have build a webapp based on cocoon 2.2. Everything is working fine
> if a single person is using the app, but as soon as we have concurrent
> user the code fails with NPE in different lines of the code.
> 
> My questions are:
> Every pipeline is thread safe, right?
> The mounts to the different servlet (blocks) is synchronized, right?
> Is there a connection timeout for inner block communications?
> 
> The architecture is as follow:
> main webapp - mounts dispatcher sitemap (from block)
> 
> Main match:
>  <map:match pattern="**.html">
>         <map:generate src="lm://resolve.structurer.{1}" type="jx">
>           <map:parameter name="lenient-xpath" value="true"/>
>           <map:parameter name="getRequest" value="{1}"/>
>           <map:parameter name="contextPath"
> value="{request:contextPath}"/>
>           <map:parameter name="getRequestExtension" value="html"/>
>         </map:generate>
>         <map:transform type="dispatcher">
>           <map:parameter name="cacheKey" value="{0}"/>
>           <map:parameter name="validityFile"
>             value="lm://resolve.structurer.{1}"/>
>           <map:parameter name="request" value="{1}"/>
>           <map:parameter name="type" value="html"/>
>           <map:parameter name="hooksTransformer"
> value="lm://hooks-to-html.xsl"/>
>         </map:transform>
>         <map:transform src="lm://namespace-stripped"/>
>         <map:transform src="lm://strip-dispatcher-remains-html.xsl"/>
>         <map:serialize type="xhtml"/>
>       </map:match>

Have you made sure that your dispatcher transformer is configured correctly? If 
it is *not* threadsafe, you have to use the "prototype" scope. Otherwise you can 
use the "singleton" scope (which is actually the default!).


-- 
Reinhard Pötz                            Managing Director, {Indoqa} GmbH
                           http://www.indoqa.com/en/people/reinhard.poetz/

Member of the Apache Software Foundation
Apache Cocoon Committer, PMC member, PMC Chair        reinhard@apache.org
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