http://qiita.com/LOUIS_rui/items/5ca16775442f3e3a355a
# /usr/sbin/update-alternatives --install /usr/bin/java java /usr/java/jdk1.8.0_25/bin/java 1000 # /usr/sbin/update-alternatives --set java /usr/java/jdk1.8.0_25/bin/java
