anchor.diff:  
   MAINTAINER XWiki Development Teeam <committers@xwiki.org>
   
  -# The base image already installs Java. So we don't install it for speed and duplication reasons,
  -# but we ensure that it's Java 8 that is installed, since that's what XWiki's master build requires.
  -# We do that by:
  -# 1. checking if the JAVA_HOME is set
  -# 2. checking that the version of Java is openjdk
  -# 3. checking that the actual version installed is an 1.8.0 (we allow the build to be upgraded)
  -# We perform those checks very early to have a fail fast, since it all depends on the parent image.
  -RUN test ! -z $JAVA_HOME && $JAVA_HOME/bin/java -version 2>&1 | grep "OpenJDK" | grep "build 1.8.0"
  +# Note: The base image already installs Java 11. So we don't need to install it again.
   
   # Install VNC + Docker CE + lsof (to list open ports for debugging reasons)
   RUN apt-get update && \
  
positive.code: # Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  # 02110-1301 USA, or see the FSF site: http://www.fsf.org.
  # ---------------------------------------------------------------------------
  FROM jenkins/ssh-slave
  
  #    ____  ____  ____      ____  _   __        _
  #   |_  _||_  _||_  _|    |_  _|(_) [  |  _   (_)
  
negative.code: # socker (docker on docker) and we want to reduce likelihood of issues.
  RUN apt-get update && \
    apt-get --no-install-recommends -y install \
      xfce4 xfce4-goodies xfonts-base tightvncserver docker-ce=18.06.3~ce~3-0~debian
  
  # Install Firefox.
  # Note 1: This won't be needed when we'll have all our functional tests use docker. However, as a transitional step,
  