Use ubuntu image with pre-installed java 8 for IT docker

[jon-wei]

The integration tests in Travis CI are failing because the docker image can't be built:

Location: http://download.oracle.com/otn-pub/java/jdk/8u144-b01/090f390dda5b47b9b721c7dfaa008135/jdk-8u144-linux-x64.tar.gz?AuthParam=1508271753_28541b80944dd708d047e6e43e9143b5 [following]
--2017-10-17 20:20:33--  http://download.oracle.com/otn-pub/java/jdk/8u144-b01/090f390dda5b47b9b721c7dfaa008135/jdk-8u144-linux-x64.tar.gz?AuthParam=1508271753_28541b80944dd708d047e6e43e9143b5
Connecting to download.oracle.com (download.oracle.com)|165.254.94.208|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2017-10-17 20:20:33 ERROR 404: Not Found.
download failed
Oracle JDK 8 is NOT installed.
dpkg: error processing package oracle-java8-installer (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 oracle-java8-installer

The patch changes the integration test docker container to build from an ubuntu 14.04 image with these commands already completed:

-# Java 8		
 -RUN apt-get update \		
 -      && apt-get install -y software-properties-common \		
 -      && apt-add-repository -y ppa:webupd8team/java \		
 -      && apt-get purge --auto-remove -y software-properties-common \		
 -      && apt-get update \		
 -      && echo oracle-java-8-installer shared/accepted-oracle-license-v1-1 select true | /usr/bin/debconf-set-selections \		
 -      && apt-get install -y oracle-java8-installer \		
 -      && apt-get install -y oracle-java8-set-default \		
 -      && rm -rf /var/cache/oracle-jdk8-installer

This is intended to be a temporary change, please refer to the comment in the PR change.

https://hub.docker.com/r/jonweiimply/ubuntu-j8/

[jon-wei]

integration tests are able to run with this patch now, but the latest run hit travis' job time limit

[jon-wei]

Travis CI passes with this, if we're still having problems tomorrow with the integration tests related to the java 8 install, this will fix the issues for now.

[gianm]

This line certainly needs some comments, ideally describing the image, linking to the Dockerfile that produced the image, and linking to this issue. It should also be temporary; even if we want to use our own Docker base image long term, it should be something in an organization repo rather than a personal repo.

[jon-wei]

Added a comment on the temporary nature of the change and a link to the dockerhub page for the image, which has a description of the commands used to build it

[drcrallen]

Can you explain more why an openjdk build does not suffice for integration tests?

I'm a bit worried about using something based on echo oracle-java-8-installer shared/accepted-oracle-license-v1-1 select true

[jon-wei]

@drcrallen When I last tried using OpenJDK instead of Oracle, the integration tests never completed, individual tests seemed to take up to 50% longer if I remember correctly, not sure why there was such slowdown

[drcrallen]

Gotcha, thanks. This is helpful for any future questions or discussions on the matter.

[KenjiTakahashi]

Be careful when using public, prebuilt Docker images with Oracle Java inside. It is not clear if it doesn't violate their convoluted licensing. Just saying, IANAL.