Debian 7.8 image with Java 8 and Java 7 installed and a jdk switcher that allows to change between java versions.
Java 8 is the version by default.
You can change yor jdk version with:
RUN echo "source ~/jdk_switcher.sh && jdk_switcher use oraclejdk7" >> /etc/bash.bashrc
Version 1.1 comes only with Java 8