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Our web application is running on a JBoss AS7 Cluster. We are also using Spring Web Flow (version 2.4.0.RELEASE) for the flow control. We are then facing a few problems during session replication. They are:

  1. Because of session replication, objects stored on session will be serialized. However,the class org.springframework.webflow.context.servlet.HttpServletRequestParameterMap is not serializable. NotSerializableException may be thrown.
  2. Spring Web Flow uses session to store conversations data on flow. This class org.springframework.webflow.conversation.impl.ConversationContainer will process the conversation data putting to/retrieving from session. We found that it uses java.util.ArrayList or java.util.HashMap to store conversations data on session. Thus, ConcurrentModificationException may be thrown while both session replication and flow control handling are processing at the same time.

Is anyone having the same or similar problems we face? And, is there any solution/alternative we can take to solve them?

Thanks

Cartman KHL
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  • Is it possible for you to `synchronize` the part of code where you are updating this `hashmap` ? – Karthik Jul 30 '15 at 17:55
  • this `HashMap` is updated by Spring Web Flow instead of our coding. Unless we change their code, it may not be possible to `synchronize` it – Cartman KHL Jul 30 '15 at 18:33

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