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Syndication does not work if WebSphere Application Server dynacache is enabled
 Technote (FAQ)
 
Question
Requests that should not be cached are being cached and causing unexpected behavior in the IBM® Web Content Management (WCM) system. Specifically, for Web Content Management syndication, you may see this null pointer exception in the logs:
com.ibm.workplace.wcm.app.ui.portlet.commands.AbstractCommand java.lang.NullPointerException at
com.aptrix.syndication.business.AbstractRequestBL.checkResponse(Unknown Source) at
com.aptrix.syndication.business.subscriber.RequestBL.getCatalog(Unknown Source) at
com.aptrix.deployment.subscriber.PlutoSubscriber.sendSubscribeRequest(UnknownSource) at
com.ibm.workplace.wcm.app.ui.portlet.formmapper.SubscriberFormMapper.doC onsumeSelf(Unknown Source) at
com.ibm.workplace.wcm.app.ui.portlet.formmapper.AbstractControllableForm
Mapper.consumeForm(Unknown Source)
at
com.ibm.workplace.wcm.app.ui.portlet.commands.AbstractCommand.consumeObj
ectModel(Unknown Source)

(truncated)

How can these exceptions be resolved?
 
Cause
The Web Content Management cachespec.xml file is most likely misconfigured. To resolve, it is necessary to exclude the IBM Web Content Management modules that use HTTP requests to function.

Most Web Content Management modules are executed as HTTP requests. If you are caching the requests at the WebSphere Application Server layer, the requests will return improper cached responses that are not expected and will result in erroneous or incorrect output by the system.
 
Answer
The following additional Cache-Id section should be included in every cachespec.xml to disable caching for Web Content Management Utility modules and Syndication:
WCM Version 5.1 and earlier:

<?xml version="1.0" ?>
<!DOCTYPE cache SYSTEM "cachespec.dtd">
<cache>
        <cache-entry>
               <cache-id>  
                   - Normal Cache-Id section describing what to cache
        </cache-id>
        <cache-id>
             <component id="MOD" type="parameter">
                    <required>true</required>
                    <not-value>Subs</not-value>
                    <not-value>Synd</not-value>
                    <not-value>ItemDispatcher</not-value>
                    <not-value>Syndication</not-value>
                    <not-value>MemberFixer</not-value>
                    <not-value>AJPEReferenceChecker</not-value>
                    <not-value>AJPEResourceChecker</not-value>
                    <not-value>AJPESiteChecker</not-value>
                    <not-value>VersioningEnablement</not-value>
                    <not-value>WorkflowEnablement</not-value>
                    <not-value>JCRModule</not-value>
                    <not-value>PlutoUploadFile</not-value>
                    <not-value>PlutoDownloadFile</not-value>
                    <not-value>AJPECatSelect</not-value>
                    <not-value>Template</not-value>
            </component>
            <timeout>7200</timeout>
       </cache-id>
   </cache-entry>
</cache>
WCM 6.0 and higher

<?xml version="1.0" ?>
<!DOCTYPE cache SYSTEM "cachespec.dtd">
<cache>
        <cache-entry>
               <cache-id>  
                   - Normal Cache-Id section describing what to cache
        </cache-id>
        <cache-id>
             <component id="MOD" type="parameter">
                    <required>true</required>
                    <not-value>Subs</not-value>
                    <not-value>Synd</not-value>
                    <not-value>ItemDispatcher</not-value>
                    <not-value>Syndication</not-value>
                    <not-value>MemberFixer</not-value>        
                    <not-value>WorkflowEnablement</not-value>
                    <not-value>JCRModule</not-value>
                    <not-value>PlutoUploadFile</not-value>
                    <not-value>PlutoDownloadFile</not-value>
                    <not-value>AJPECatSelect</not-value>
                    <not-value>Template</not-value>
            </component>
            <timeout>7200</timeout>
       </cache-id>
   </cache-entry>
</cache>
 
 
 

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Document information
 Product categories:
 Software
 Enterprise Content Management
 Content Management
 Workplace Web Content Management
 Caching
 Operating system(s):
  AIX, HP-UX, Linux, Linux Red Hat - iSeries, Linux SuSE - iSeries, Linux iSeries, OS/400, Solaris, Windows, i5/OS
 Software version:
  2.5, 2.5.0.1, 5.1.0, 5.1.0.1, 5.1.0.3, 5.1.0.4, 5.1.0.5, 6.0, 6.0.0.1, 6.0.0.3, 6.0.0.4, 6.0.1, 6.0.1.1, 6.0.1.2, 6.0.1.3
 Software edition:
  Java edition
 Reference #:
  1242955
 IBM Group:
 Software Group
 Modified date:
 2008-02-11

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