/usr/lib/jvm/java-7-openjdk-amd64/bin/javaws is in icedtea-netx 1.5.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/jvm/java-7-openjdk-amd64/bin/../jre/bin/javaws
/usr/lib/jvm/java-7-openjdk-amd64/bin/../jre/bin/javaws