Support Java 8

[mogrifier]

I was trying to run lambda expressions in a Java job and noticed the image is running Java 1.5. That's really old. Any reason it can't be updated to 1.8

ps - image works great other than that.

[mogrifier]

I just noticed the hadoop base image has been updated to sequenceiq/hadoop-docker:2.7.1
This includes Java 7 support, but still need 8.

[rotulet]

up!
I have the same need: all the code we need to push onto the worker use java 1.8.

Thanks.

[pjfanning]

I have a fork which uses jdk8 - https://github.com/pjfanning/docker-spark-jdk8