Fix #430: Use OpenJDK (#431)

Change both Dockerfiles (docker and docker_ci) to support OpenJDK 8 instead of Oracle JDK 8.

docker/Dockerfile

@@ -1,4 +1,5 @@
-FROM anapsix/alpine-java:8_jdk
+FROM openjdk:8-jdk-alpine
+
 
 LABEL maintainer="[email protected]"
 
@@ -31,6 +32,7 @@ RUN apk update \
       graphviz \
       maven \
       subversion \
+      bash \
  \
  # Install gradle
  && wget -q https://services.gradle.org/distributions/gradle-$GRADLE_VERSION-bin.zip \

docker/Dockerfile_ci

@@ -7,8 +7,6 @@ ENV DEBIAN_FRONTEND noninteractive
 ENV LANG=C.UTF-8 \
     GRADLE_VERSION=4.0.2 \
     GRADLE_HOME=/usr/local/gradle
-ENV JAVA_HOME /usr/lib/jvm/java-8-oracle
-ENV PATH $PATH:$JAVA_HOME/bin
 
 # Setup container environment
 RUN apt-get clean \
@@ -22,13 +20,8 @@ RUN apt-get clean \
       && locale-gen en_US en_US.UTF-8 \
       && dpkg-reconfigure locales \
       && echo "APT::Get::Assume-Yes \"true\";\nAPT::Get::force-yes \"true\";" >> /etc/apt/apt.conf.d/90forceyes \
-      && add-apt-repository ppa:webupd8team/java \
-      && apt-get update \
-      && echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | debconf-set-selections \
-      && apt-get install -y oracle-java8-installer \
-      && update-alternatives --set java "$JAVA_HOME/jre/bin/java" \
-      && update-alternatives --set javac "$JAVA_HOME/bin/javac" \
-      && update-alternatives --set javaws "$JAVA_HOME/jre/bin/javaws" \
+      && apt-get install openjdk-8-jdk \
+      && apt-get install wget \
       && apt-get clean \
       && apt-get autoclean \
       && apt-get autoremove
@@ -109,4 +102,4 @@ RUN \
           && mv selenium-server-standalone-3.12.0.jar /usr/local/bin/selenium-server-standalone-3.12.0.jar \
           && ln /usr/lib/chromium-browser/chromedriver /usr/local/bin/chromedriver
 
-WORKDIR /mubench
+WORKDIR /mubench