upgraded to tomcat9 issues

[Peter Schober]

* Christopher Bongaarts via users <users at shibboleth.net> [2020-09-01 22:11]:
> But if it got this far, I would have expected to see output in
> idp-process.log, so you might also want to double-check your logging
> configuration and filesystem permissions.

There's also the possibility of changed Tomcat packaging. E.g. when
Debian (which is the basis for Ubuntu) updated Tomcat 8 to 9 in Debian
10 they also moved the service management from SysV to systemd.
And the default systemd configuration for tomcat included
ProtectSystem=strict and a default set of ReadWritePaths limitations,
preventing tomcat from writing anywhere else on the file system -- so
no metadata file backups and no local log files.

If that's the case the workaround is easy, cf.
http://shibboleth.net/pipermail/users/2020-April/046659.html
http://shibboleth.net/pipermail/users/2020-May/046924.html

-peter