I have empty directory /var/www.
Directory /test-jail/var/www is not created using jk_init -j /test-jail apachetest

[apachetest]
comments = apache test web server
executables = /usr/sbin/apache2, /usr/sbin/apache2ctl, /etc/init.d/apache2, /bin/sh, /usr/bin/env, /bin/mkdir, /usr/bin/install, /bin/rm, /lib/lsb/init-functions, /bin/grep, /bin/echo
directories = /etc/apache2, /var/www, /usr/share/apache2, /usr/lib/apache2/, /var/log/apache2
libraries = /lib/libnsl.so.1, /lib64/libnsl.so.1, /lib/libnss*.so.2, /lib64/libnss*.so.2
devices = /dev/null, /dev/urandom
users = root, www-data
groups = root, www-data