/usr/share/maven-repo/org/antlr/antlr4-runtime/debian/antlr4-runtime-debian.jar is in libantlr4-runtime-java 4.5.1-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/org/antlr/antlr4-runtime/debian/../../../../../java/antlr4-runtime.jar