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# root
su -

# Install JDK in system
rpm -Uvh /path/.../jdk-8u40-linux-i586.rpm

# Use correct Java
alternatives --install /usr/bin/java java /usr/java/latest/jre/bin/java 2000000
alternatives --install /usr/bin/javac javac /usr/java/latest/bin/javac 2000000
alternatives --install /usr/bin/javaws javaws /usr/java/latest/jre/bin/javaws 2000000
alternatives --install /usr/bin/jar jar /usr/java/latest/bin/jar 2000000

# Example how to swap javac
# alternatives --config javac