/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/ is in libplexus-utils2-java-doc 3.0.22-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/CycleDetectedException.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/CycleDetector.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/DAG.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/TopologicalSorter.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/Vertex.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/class-use/
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/class-use/CycleDetectedException.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/class-use/CycleDetector.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/class-use/DAG.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/class-use/TopologicalSorter.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/class-use/Vertex.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/package-frame.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/package-summary.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/package-tree.html
/usr/share/doc/libplexus-utils2-java/api/org/codehaus/plexus/util/dag/package-use.html