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Websphere - Servant not of expected type

 
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I am using WSAD 4.0.3 which is using Websphere Test Server 4.0.2. We have stateless session beans and entity beans with CMP in my application. Client program call the session bean and in turn the session bean will call the entity bean to do persistence.
We use WEBSPHERE application server 4.0.5 and we create a .ear file from WSAD and it is deployed on the server.
In my client class, I do the folowing to invoke the session bean:

This code work fine for few requests from cleint. And all of a sudden groupSession becomes null and I get "Servant not of expected type" error.
I would appreciate any help to solve this issue.
Thanks
Sri
 
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