https://bz.apache.org/bugzilla/show_bug.cgi?id=63324

            Bug ID: 63324
           Summary: CrawlerSessionManagerValve is getting put into
                    Session, which causes problems when serializing
                    sessions
           Product: Tomcat 8
           Version: 8.5.x-trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P2
         Component: Catalina
          Assignee: dev@tomcat.apache.org
          Reporter: martin.leman...@willhaben.at
  Target Milestone: ----

Created attachment 36512
  --> https://bz.apache.org/bugzilla/attachment.cgi?id=36512&action=edit
the stacktrace, which indicates the serialization

We are using a serialization library to serialize our sessions between multiple
tomcat instances. 

During our OpenJDK 11 upgrade, we've found out, that the
CrawlerSessionManagerValve is in the session, which has dependencies to JDK
internals.

We don't want to serialize JDK internals between server ups and downs. 

I've already created a PR to fix this issue, by providing a smaller class to
the session attributes. 

https://github.com/apache/tomcat/pull/154

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