[MINOR] Added package to R dependency; updated Docker test image

* Upcoming TomekLink builtin needs the R package "unbalanced"
* The docker image for our automated testing was updated to add the missing R package.
* Due to a missing java 8 package in Debian testing, the docker image for automated tests now uses a binary OpenJDK distribution from http://adoptopenjdk.net.
* Readme.m in the docker sub directory was changed to point to SystemDS "official" docker images.

docker/README.md

@@ -31,16 +31,16 @@ To Build the docker image simply run the build script.
 ./docker/build.sh
 ```
 
-Afterwards you should have a local image with the id `sebaba/sysds:0.2`.
+Afterwards you should have a local image with the id `systemds/sysds:latest`.
 To execute any given DML script follow the step Run.
 
 ## Run
 
 Running SystemDS in a docker container is as simple as constructing any DML script
-Then Download the docker image `sebaba/sysds:0.2` or build your own.
+Then Download the docker image `systemds/sysds:latest` or build your own.
 
 ```bash
-docker pull sebaba/sysds:0.2
+docker pull systemds/sysds:latest
 ```
 
 Verify that the docker image correctly works simply by running it, make sure that your terminal is pointing at the root of you systemds git clone.
@@ -56,7 +56,7 @@ You can mount any such folder and execute systemds on by changing the first part
 ```bash
 docker run \
   -v $(pwd)/docker/mountFolder:/input \
-  --rm sebaba/sysds:0.2
+  --rm systemds/sysds:latest
 ```
 
 ## Testing
@@ -72,7 +72,7 @@ To build this image simply run the same command as above.
 Because the github action pulls the image from docker hub the image has to be pushed to docker hub to produce any change in the behavior of the testing.
 
 ```bash
-docker push sebaba/testingsysds:0.2
+docker push systemds/testingsysds:latest
 ```
 
 For each of the tests that require R, this image is simply used, because it skips the installation of the R packages, since they are installed in this image.
@@ -82,6 +82,6 @@ Test your testing image locally by running the following command:
 ```bash
 docker run \
   -v $(pwd):/github/workspace \
-  sebaba/testingsysds:0.2 \
+  systemds/testingsysds:latest \
   org.apache.sysds.test.component.*.**
 ```

docker/testsysds.Dockerfile

@@ -29,17 +29,22 @@ WORKDIR /usr/src/
 
 ENV MAVEN_VERSION 3.6.3
 ENV MAVEN_HOME /usr/lib/mvn
-ENV PATH $MAVEN_HOME/bin:$PATH
+ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64
+ENV PATH $JAVA_HOME/bin:$MAVEN_HOME/bin:$PATH
 
-RUN wget http://archive.apache.org/dist/maven/maven-3/$MAVEN_VERSION/binaries/apache-maven-$MAVEN_VERSION-bin.tar.gz && \
-	tar -zxvf apache-maven-$MAVEN_VERSION-bin.tar.gz && \
-	rm apache-maven-$MAVEN_VERSION-bin.tar.gz && \
-	mv apache-maven-$MAVEN_VERSION /usr/lib/mvn
+RUN mkdir /usr/lib/jvm
+RUN wget -qO- \
+https://github.com/AdoptOpenJDK/openjdk8-binaries/releases/download/jdk8u282-b08/OpenJDK8U-jdk_x64_linux_hotspot_8u282b08.tar.gz \
+| tar xzf -
+RUN mv jdk8u282-b08 /usr/lib/jvm/java-8-openjdk-amd64
+
+RUN wget -qO- \
+http://archive.apache.org/dist/maven/maven-3/$MAVEN_VERSION/binaries/apache-maven-$MAVEN_VERSION-bin.tar.gz | tar xzf -
+RUN mv apache-maven-$MAVEN_VERSION /usr/lib/mvn
 
 # Install Extras
 RUN apt-get update -qq && \
 	apt-get upgrade -y && \
-	apt-get install openjdk-8-jdk-headless -y && \
 	apt-get install libcurl4-openssl-dev -y && \
 	apt-get install libxml2-dev -y && \
 	apt-get install r-cran-xml -y 

src/test/scripts/installDependencies.R

@@ -60,6 +60,7 @@ custom_install("dbscan");
 custom_install("imputeTS");
 custom_install("FNN");
 custom_install("class");
+custom_install("unbalanced");
 
 print("Installation Done")
 
@@ -68,4 +69,4 @@ print("Installation Done")
 # e.g. "sudo Rscript installDependencies.R a b"
 if (length(args) == 2) {
 	list_user_pkgs()
-}
+}