anchor.diff:  # 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
  +FROM jenkins/ssh-slave:jdk11
   
   #    ____  ____  ____      ____  _   __        _
   #   |_  _||_  _||_  _|    |_  _|(_) [  |  _   (_)
  
positive.code: 
  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"
  
  # Install VNC + Docker CE + lsof (to list open ports for debugging reasons)
  RUN apt-get update && \
  
negative.code: ENV FIREFOX_DOWNLOAD_URL_1="https://download-installer.cdn.mozilla.net/pub/firefox/releases/$FIREFOX_VERSION_1/linux-x86_64/en-US/firefox-$FIREFOX_VERSION_1.tar.bz2"
  ENV FIREFOX_VERSION_2 32.0.1
  ENV FIREFOX_DOWNLOAD_URL_2="https://download-installer.cdn.mozilla.net/pub/firefox/releases/$FIREFOX_VERSION_2/linux-x86_64/en-US/firefox-$FIREFOX_VERSION_2.tar.bz2"
  RUN apt-get --no-install-recommends -y install libasound2 && \
    wget --no-verbose -O /tmp/firefox1.tar.bz2 $FIREFOX_DOWNLOAD_URL_1 && \
    rm -rf /opt/firefox && \
    tar -C /opt -xjf /tmp/firefox1.tar.bz2 && \
  