Hello,
I've just installed the following from stretch-backports:
$ dpkg --list | grep tomcat9 | cut -c1-60
ii libtomcat9-java 9.0.16-4~bpo9+1
ii tomcat9 9.0.16-4~bpo9+1
ii tomcat9-common 9.0.16-4~bpo9+1
And got the following error on initial start-up:
[2020-09-10 14:59:31] [info] mkdir: cannot create directory
‘/var/lib/tomcat9/policy’: Read-only file system
I then did a 'mkdir' and tried to do a chown/chgrp to the tomcat
user/group and got:
[2020-09-10 15:12:39] [info] rm: cannot remove
'/var/lib/tomcat9/policy': Read-only file system
I copied over the config file:
$ sudo cp -p /lib/systemd/system/tomcat9.service /etc/systemd/system/
And tried adding the following line:
ReadWritePaths=/var/lib/tomcat9/policy/
Did not help. I then put:
ReadWritePaths=/var/lib/tomcat9/
and things were okay.
Further, on package installation, the package was expecting a "tomcat"
group because a 'chown' failed:
Creating config file /etc/tomcat9/tomcat-users.xml with new version
chown: invalid group: ‘root:tomcat’
I did a 'vigr' and created a "tomcat" group with the same GID as
"tomcat8" and that allowed the installation to finish.
