Hi,
As far I as know, all
Servlet container must support
Java Native Serialization mechanism for session distribution, which is indicated by the marker interface java.io.Serializable. The container is not only limited to that mechanism. They are free to use any other means to serialize the HttpSession's attributes around the nodes.
For example, some containers support the serialization of InitialContext even though it does not implement Serializable.
But beside instances of some specific classes, the container usually requires the adhoc classes to implement Serializable though.
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