I have now managed to get the updated package to install by renaming
/etc/tomcat8 and /etc/default/tomcat8 so that the installer didn't see
the previous configuration, but the installer did not then create new
configs, which prevented tomcat from starting up. (It failed with the
error "tomcat8: Starting Tomcat servlet engine: tomcat8cat:
/var/lib/tomcat8/conf/policy.d/*.policy: No such file or directory")
After restoring my old config files to their original names, I am now
able to start tomcat and it appears to be working properly. Looks like
the package has some problems in how it handles config files, though.
This is the maintainer address of Debian's Java team
debian-j...@lists.debian.org for discussions and questions.