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https://issues.apache.org/jira/browse/OFBIZ-4289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13400479#comment-13400479
 ] 

Jacques Le Roux commented on OFBIZ-4289:
----------------------------------------

I get this also (in a customised instance but not much cannched for framework)
2012-06-12 10:35:29,921 (OFBiz_Shutdown_Hook) [    
StandardSession.java:1567:WARN ] Cannot serialize session attribute 
_LAST_VIEW_PARAMS_ for session 00C48D0D76821C98403482FAE8B77C24.jvm1
java.io.NotSerializableException: net.sf.json.JSONObject
        at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1164)
        at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
        at javolution.util.FastMap.writeObject(FastMap.java:1513)

Do _LAST_VIEW_PARAMS_ is a FastMap<String, Object> returned by 
UtilHttp.getParameterMap(). I read it implements javolution.xml.XMLSerializable 
but not sure what this is and the Tomcat StandarManager does not seems to 
appreciate (StandardSession.java:1567:WARN). We can replace by an HashMap which 
implements Serializable
{code}
Index: framework/base/src/org/ofbiz/base/util/UtilHttp.java
===================================================================
--- framework/base/src/org/ofbiz/base/util/UtilHttp.java        (revision 
1353393)
+++ framework/base/src/org/ofbiz/base/util/UtilHttp.java        (working copy)
@@ -113,7 +113,7 @@
      */
     public static Map<String, Object> getParameterMap(HttpServletRequest 
request, Set<? extends String> nameSet, Boolean onlyIncludeOrSkip) {
         boolean onlyIncludeOrSkipPrim = onlyIncludeOrSkip == null ? true : 
onlyIncludeOrSkip.booleanValue();
-        Map<String, Object> paramMap = FastMap.newInstance();
+        Map<String, Object> paramMap = new HashMap<String, Object>();
 
         // add all the actual HTTP request parameters
         Enumeration<String> e = UtilGenerics.cast(request.getParameterNames());
{code}

I tried it seems to work fine (small test, see attached log)

Note that LAST_VIEW_PARAMS was introduced previously to multitenant changes. 
There are maybe other such Objects put in session, but (quickly) looking around 
in RequestHandler found none (others are simple String).
                
> Login out on a cluster handled by DeltaManager causes a NPE
> -----------------------------------------------------------
>
>                 Key: OFBIZ-4289
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-4289
>             Project: OFBiz
>          Issue Type: Bug
>          Components: framework
>    Affects Versions: Release Branch 4.0, Release Branch 09.04, Release Branch 
> 10.04, Release Branch 11.04, SVN trunk
>         Environment: Ubuntu
>            Reporter: Jacques Le Roux
>            Assignee: Jacques Le Roux
>            Priority: Critical
>              Labels: cluster, logout
>             Fix For: Release Branch 10.04, Release Branch 11.04, SVN trunk
>
>         Attachments: OFBIZ-4289_Login_out_on_a 
> cluster_handled_by_DeltaManager_causes_a_NPE.patch, OFBIZ-4289_Login_out_on_a 
> cluster_handled_by_DeltaManager_causes_a_NPE.patch, OFBIZ-4289_Login_out_on_a 
> cluster_handled_by_DeltaManager_causes_a_NPE.patch, OFBIZ-4289_Login_out_on_a 
> cluster_handled_by_DeltaManager_causes_a_NPE.patch, OFBIZ-4289_Login_out_on_a 
> cluster_handled_by_DeltaManager_causes_a_NPE.patch, OFBIZ-4289_Login_out_on_a 
> cluster_handled_by_DeltaManager_causes_a_NPE.patch, OFBIZ-4289_Login_out_on_a 
> cluster_handled_by_DeltaManager_causes_a_NPE.patch, OFBIZ-4289_Login_out_on_a 
> cluster_handled_by_DeltaManager_causes_a_NPE.patch, OFBIZ-4289_Login_out_on_a 
> cluster_handled_by_DeltaManager_causes_a_NPE.patch, changeset_2510.diff, 
> ofbiz.log
>
>
> It works locally but not on clusters. You simply get a NPE.
> h3. Problem
>     * When we logout we cross an issue due to Tomcat sessions persistence.
>     * Because we set distributable to true, to allow sessions failover,
>     * and use and DeltaManager for replication.
>     * Delegator and other main Classes (notably Dispatcher) are not 
> serialized in OFBiz. This is the origin of the problem 
> h3. Tried solutions
> By default DeltaManager save active sessions on disk. It uses a private 
> String variable pathname for that (default to "SESSIONS.ser"). You can set it 
> to null, to avoid session persistence, using a context.xml file in the 
> WEB-INF folder with content like below. But I tried it in webtools app on 
> staging qs001 (only) and it did not work (with distributable set to false). 
> And we have no other means to set it from OFBiz (OOTB).
> {code}
>     <Context>
>      <Manager className="org.apache.catalina.session.DeltatManager" 
> pathname="">
>      </Manager>
>     </Context>
> {code}

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