anchor.diff:  
   USER root
   
  -RUN apt-get update && apt-get -y upgrade 
  +RUN apt-get update && apt-get -y upgrade
   
   RUN apt-get install -y software-properties-common && apt-get install -y --no-install-recommends apt-utils
   
  
positive.code: # Install Node
  RUN apt-get update && apt-get install -y curl
  RUN curl -sL https://deb.nodesource.com/setup_12.x | bash - && apt-get install -y nodejs
  
  # Java 8
  RUN apt-get install -y openjdk-8-jdk-headless
  
  # Maven
  RUN apt-get install -y maven
  
  # git
  RUN apt-get install -y git
  
negative.code: # docker
  RUN apt-get update && apt-get -y install docker.io
  
  # Java 11
  RUN add-apt-repository ppa:openjdk-r/ppa && \
  	apt-get update && \
  	apt-get install -y openjdk-11-jdk-headless
  
  # This is a fix: JDK 11 in Ubuntu 16.04 misses Java certs
  RUN wget https://download.java.net/openjdk/jdk8u41/ri/openjdk-8u41-b04-linux-x64-14_jan_2020.tar.gz -P /tmp/jdk8
  RUN	tar -zxvf /tmp/jdk8/openjdk-*.tar.gz -C /tmp/jdk8 --strip-components=1 && \
  	cp /tmp/jdk8/jre/lib/security/cacerts /etc/ssl/certs/java && \
  	update-ca-certificates -f && \
  	rm -rf /tmp/jdk8
  
  # Maven
  RUN apt-get install -y maven
  
  # Cleanup
  RUN rm -rf /var/lib/apt/lists/*
  RUN apt-get autoremove --purge -y && apt-get autoclean
  