I did -almost- the same, but used the WebUpd8 installer in @Udo_Hartmann link to get automated java updates in the future (I wasn’t aware that this is not done automatically through apt-get update/upgrade on a Raspbian Jessie installation on a Raspberry Pi), but you have to make a slight change to the tutorial: instead of su - use sudo su:
sudo su
echo "deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee /etc/apt/sources.list.d/webupd8team-java.list
echo "deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main" | tee -a /etc/apt/sources.list.d/webupd8team-java.list
apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys EEA14886
apt-get update
apt-get install oracle-java8-installer
exit
After rebooting my.openhab started working again.