Gustavo,

On 20.06.21 04:54, Gustavo Almeida wrote:
"Configuration Reference - The Manager Component" says:
"A Manager element MAY be nested inside a Context component. If it is not
included, a default Manager configuration will be created automatically"

My Context has no nested Manager element.

So, guessing I'm using by default the Standard Manager Implementation,
where does it store active sessions, if it does at all?

Olaf is right. StandardManager keeps active sessions in Memory. However, when its _Persistence Across Restarts_ features comes into play (https://tomcat.apache.org/tomcat-10.0-doc/config/manager.html#Persistence_Across_Restarts), it persists active sessions to disk in order to preserve these across a restart of either the context or the whole server.

Configuration option 'pathname' specifies, where on disk sessions are persisted. StandardManager serializes all sessions into a single file specified by 'pathname'. This defaulted to "SESSIONS.ser" and was a file path relative to the context's TEMP directory. However, on 2020-02-18 that was changed to null, effectively disabling the Session Persistence Feature by default due to possible performance issues with a large number of sessions.

If you want it back, you could set 'pathname' to an absolute path of your choice. However, on Ubuntu, Tomcat runs in a sandbox and by default only has write access to a defined list of directories (see file tomcat9.service) as well as to /tmp and /cache.

Option 'pathname' can also take a path relative to the context's work directory, which is in /var/lib/tomcat9/work (a symlink to /var/cache/tomcat9/). There, under Catalina/<hostname, typically localhost> is a directory named after the context. That is the context's working directory. This is where "SESSIONS.ser" used to be.





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