s/oracle-java8-installer/openjdk-8-jdk/

We should not be installing unauthenticated packages..
The webupd8 PPA is notorious for leaving installation broken for
long periods of time, whenever Oracle decides to make changes to
downloads, as well as when JDK releases occur.


git-svn-id: http://svn.apache.org/repos/asf/cassandra/site@1855364 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/Dockerfile b/Dockerfile
index 1d68224..ae2087e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,20 +1,10 @@
 FROM debian:latest
 
-# Install Java
-RUN echo oracle-java8-installer shared/accepted-oracle-license-v1-1 select true | debconf-set-selections && \
-    apt-get update && \
-    apt-get install -y \
-        software-properties-common \
-        gpg && \
-    add-apt-repository -y ppa:webupd8team/java && \
-    apt-get update && \
-    apt-get install -y --allow-unauthenticated oracle-java8-installer && \
-    rm -rf /var/lib/apt/lists/* && \
-    rm -rf /var/cache/oracle-jdk8-installer
-
-# Install other tools
+# Install tools
 RUN apt-get update && \
     apt-get install -y \
+        openjdk-8-jdk \
+        procps \
         git \
         python2.7 \
         python-pip \