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Joel,

On 3/12/19 09:43, Joel Griffith wrote:
> I'm upgrading a webapp server from Tomcat 7 to Tomcat 8 on Ubuntu
> 16.04. At installation, Tomcat 7 creates a directory
> `/var/lib/tomcat7/common/`. When Tomcat 8 is installed, however,
> the `/var/lib/tomcat8/` directory it creates does not include a
> `common/` directory, and the deployment script complains that it
> isn't there.
> 
> build.xml:129: /var/lib/tomcat8/common/lib does not exist.

This must be a deployment script that is managed by neither the Tomcat
project nor the Ubuntu package maintainers. You will need to update it.

> I've been searching for a day and have found exactly zero
> documentation on this, including on the official 8.0 migration
> guide ( https://tomcat.apache.org/migration-8.html).

You are right; it isn't mentioned. That should be added to the
migration guide.

> What is the `/var/lib/tomcat7/common/` directory for, and why does
> Tomcat 8 not have one?

Tomcat used to have a somewhat complex series of directories
containing libraries. You can read about it, here:
http://tomcat.apache.org/tomcat-7.0-doc/class-loader-howto.html#Class_Lo
ader_Definitions

Tomcat 8 has removed some of that complexity by merging the "shared"
(lib/) and "common" (common/lib/) classloaders.

The "common" classloader was removed because it caused a lot of
confusion and didn't really provide much benefit.

- -chris
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