/usr/share/netbeans/harness/modules/ext/jemmy-2.3.0.0.jar is in libnb-platform-devel-java 7.0.1+dfsg1-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/netbeans/harness/modules/ext/../../../../java/jemmy2.jar