/usr/share/java/mac_widgets.jar is in libmac-widgets-java 0.10.0+svn416-dfsg1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/mac_widgets-0.10.0+svn416.jar
/usr/share/java/mac_widgets-0.10.0+svn416.jar