Installiere und setze JAVA-Alternativen.

java_alternativen.sh

# http://download.oracle.com/otn-pub/java/jdk/8u73-b02/jdk-8u73-linux-x64.tar.gz

sudo update-alternatives --install "/usr/bin/java" "java" "/opt/Oracle_Java/jdk1.8.0_73/bin/java" 1
sudo update-alternatives --install "/usr/bin/javac" "javac" "/opt/Oracle_Java/jdk1.8.0_73/bin/javac" 1
sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/opt/Oracle_Java/jdk1.8.0_73/bin/javaws" 1
sudo update-alternatives --install "/usr/bin/jar" "jar" "/opt/Oracle_Java/jdk1.8.0_73/bin/jar" 1 

# Alternativen-System konfigurieren:

sudo update-alternatives --set "java" "/opt/Oracle_Java/jdk1.8.0_73/bin/java"
sudo update-alternatives --set "javac" "/opt/Oracle_Java/jdk1.8.0_73/bin/javac"
sudo update-alternatives --set "javaws" "/opt/Oracle_Java/jdk1.8.0_73/bin/javaws"
sudo update-alternatives --set "jar" "/opt/Oracle_Java/jdk1.8.0_73/bin/jar"