/usr/share/java/jchart2d.jar is in libjchart2d-java 3.2.2+dfsg-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/jchart2d-3.2.2.jar
/usr/share/java/jchart2d-3.2.2.jar