Update Dockerfile

java8/Dockerfile

@@ -1,11 +1,11 @@
-FROM ubuntu:18.04
+FROM azul/zulu-openjdk-debian:8-latest
 MAINTAINER Mateusz Żółtak <[email protected]>
 
 # install software
 ENV DEBIAN_FRONTEND=noninteractive
 RUN sed -i -e 's~http://archive~http://at.archive~' /etc/apt/sources.list && \
   apt-get update && apt-get dist-upgrade -y && \
-  apt-get install -y openjdk-8-jre-headless maven ant \
+  apt-get install -y maven ant \
                      supervisor links curl vim nano locales && \
   apt-get clean
 
@@ -14,7 +14,7 @@ RUN locale-gen en_US.UTF-8
 ENV LANG en_US.UTF-8
 ENV LANGUAGE en_US:en
 
-ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64
+ENV JAVA_HOME=/usr/lib/jvm/zulu8
 
 COPY supervisord.conf /etc/supervisor/conf.d/supervisord.conf