Ran into this while trying to switch to openjdk 7 on a number of machines. You can get rid of the old javaws-alternative using
update-alternatives --remove javaws /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/javaws
It will then automatically use the openjdk-7 version.
Ran into this while trying to switch to openjdk 7 on a number of machines. You can get rid of the old javaws-alternative using alternatives --remove javaws /usr/lib/ jvm/java- 6-openjdk- amd64/jre/ bin/javaws
update-
It will then automatically use the openjdk-7 version.