/usr/share/java/jas-plotter-2.2.6.jar is in libjas-plotter-java 2.2.6+dfsg1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/../maven-repo/org/freehep/jas-plotter/2.2.6/jas-plotter-2.2.6.jar