You can also install openjdk 8 version from jessie backports archive.
To do this:
- Add jessie-backports into apt if it is not added previously:
echo "deb http://http.debian.net/debian jessie-backports main" | \
sudo tee --append /etc/apt/sources.list.d/jessie-backports.list > /dev/null
- Update apt package database:
sudo apt-get update
- Install related packages:
sudo apt-get install -t jessie-backports openjdk-8-jdk
- And optionally, set default java version to newly installed 1.8:
sudo update-java-alternatives -s java-1.8.0-openjdk-amd64