session doesn't implement Serializable interface. The persistence of the session fails? (so there should be a log about this failure! why there is nothing?) or session persistence get done without persisting that attribute?(so this would be the cause of my problem and there is no warnings about the lost attribute in catalina logs...)
This problem has been solved by adding <distributable/> to my web.xml although I don't know why. I think it is enough to only adding distributable = true to the tomcat confs.
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