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From Joerg Heinicke <>
Subject Re: [2.2] Weird NPE when concurrency
Date Fri, 01 Feb 2008 00:42:58 GMT
On 31.01.2008 16:35, Thorsten Scherler wrote:

>> 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!).
> This is what I always thought and how it is in 2.1 and the old 2.2.
> version of cocoon that forrest is using.
> <bean id="dispatcher"
>     name="org.apache.cocoon.transformation.Transformer/dispatcher"
>     class="org.apache.forrest.dispatcher.transformation.DispatcherTransformer">
>     <property name="manager" ref="org.apache.avalon.framework.service.ServiceManager"/>
>   </bean>
> We made a test with forrest trunk and this fixed the errors but before
> migrating the app I will test with defining the "singleton" scope.

If you have already concurrency issues then you might try the prototype 
scope! With the above setup the DispatcherTransformer IS in singleton scope.


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