/usr/share/maven-repo/org/apache/ant/ant-antlr/debian/ant-antlr-debian.jar is in ant-optional 1.9.3-2ubuntu0.1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/org/apache/ant/ant-antlr/debian/../../../../../../java/ant-antlr-1.9.3.jar