Control: tags -1 + fixed I believe this bug has been fixed in <https://anonscm.debian.org/cgit/pkg-java/gant.git/commit/?id=3914147e1cb497a6891a8daeb908b58464834457>.
But I'm not the maintainer behind this package so I'll leave the rest for its maintainers. I found this bug during a rebuild of all reverse build dependencies of Gradle.