Let's assume that an HttpSession, that contains a mix of non-Serializable attributes and Serializable ones (that will actually serialize properly), needs to be transferred between cluster nodes. Does the Servlet spec requires container implementations to transfer all the Serializable attirbutes or are implementations free to decide that if some attributes are not Serializable, then nothing will be transferred or only those attributes that get serialized before the first serialization Exception occurs?
I hope, that such requirement exists in the specs, but I couldn't find any reliable confirmation.