Hello, Just to share, got the same problem after upgrading two from my xwiki from 7.x to 8..1 Since 24/05/2016 with xwiki 8.1 java runtime Java is 8 (before 7). To solve it fast : vi /etc/apt/sources.list Just add : deb http:~/~/ftp.fr.debian.org/debian/ <http://ftp.fr.debian.org/debian/> jessie-backports main Then sudo apt-get update apt-get install openjdk-8-jre-headless apt-get install openjdk-8-jdk Then if Java7 was installed previously, change main 'java’ and 'javac’ command to point to Java8 sudo /usr/sbin/update-java-alternatives -s java-1.8.0-openjdk-amd64 Then everything works fine for me. Regards, zoldax