Not serializable Exceptions

[KLyko]

We are getting often java.io.NotSerializableException exceptions. E.g in: de.uni_leipzig.simba.saim.gui.widget.window.EndpointWindow$1. It seems they're thrown when tomcat tries to restore session.
see: https://vaadin.com/de/forum/-/message_boards/view_message/1056756

Donno if it is of any importance.

[KonradHoeffner]

I tried to solve this by marking as transient the Configuration instance in SAIMApplication, the instance of the EndpointWindow in the EndpointStep and all the instances of Logger. Unfortunately this does not seem to resolve the error but I guess it is some kind of Tomcat misconfiguration in that it tries to restore the previous session on restart. AFAIK this is not intended anyways so I guess it is just the annoyance of the error message.