pi@raspberrypi:~ $ sudo update-java-alternatives -s jdk-8-oracle-arm32-vfp-hflt
update-alternatives: fejl: ingen alternativer til jmc
update-alternatives: fejl: ingen alternativer til jvisualvm
update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/jdk-8-oracle-arm32-vfp-hflt/bin/jmc
update-java-alternatives: jdk alternative does not exist: /usr/lib/jvm/jdk-8-oracle-arm32-vfp-hflt/bin/jvisualvm