Does replication group have to be set for session replication

I have delployed an servlet based application on a 3 node cluster. I have a simple POJO that I use to carry data in the session from a "confirm?" to "confirmed" page. This object implements serializable and only has String and int members. I put it in session using request.getSession().setAttribute("dto", myobject). For some reason it is not being replicated to the other nodes in the cluster. My weblogic.xml has "PersistentStoreType" set to "replicated_if_clustered". I am not seeing any serialization or other errors in the node logs.
          I have looked at information contained in the link below and I think we are doing everything right. http://support.bea.com/application_content/product_portlets/support_patterns/wls/HTTP_Session_Replication_Failures_Pattern.html
          The only thing that I noticed is that the "Replication Group" is not set for any of the servers in the cluster. Does this need to be set for replication to happen?

Hi,
          Having replication group is optional. It is used only if you are implementing failover in cluster. For session replication one has to generally configure 3 things:
          - in memory replication
          - jdbc replication
          - file sytem replication
          for im memory replication,
          Step 1:
          make sure taht a client is accesing the cluseter using either
          - load balancing hardware
          - web servers with weblogic proxy plugin
          Step 2:
          specify the persistance type in weblogic.xml
          Thanks,
          Sushma

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