/usr/share/doc/libmaven-file-management-java/api/org/apache/maven/shared/model/fileset/util/ is in libmaven-file-management-java-doc 1.2.1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libmaven-file-management-java/api/org/apache/maven/shared/model/fileset/util/FileSetManager.html
/usr/share/doc/libmaven-file-management-java/api/org/apache/maven/shared/model/fileset/util/class-use//
/usr/share/doc/libmaven-file-management-java/api/org/apache/maven/shared/model/fileset/util/class-use/FileSetManager.html
/usr/share/doc/libmaven-file-management-java/api/org/apache/maven/shared/model/fileset/util/package-frame.html
/usr/share/doc/libmaven-file-management-java/api/org/apache/maven/shared/model/fileset/util/package-summary.html
/usr/share/doc/libmaven-file-management-java/api/org/apache/maven/shared/model/fileset/util/package-tree.html
/usr/share/doc/libmaven-file-management-java/api/org/apache/maven/shared/model/fileset/util/package-use.html