/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/ is in libplexus-container-default-java-doc 1.0-alpha-9-stable-1-7.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/AbstractComponentDiscoverer.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/ComponentDiscoverer.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/ComponentDiscovererManager.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/ComponentDiscoveryEvent.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/ComponentDiscoveryListener.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/DefaultComponentDiscoverer.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/DefaultComponentDiscovererManager.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/DiscoveryListenerDescriptor.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/PlexusXmlComponentDiscoverer.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/package-frame.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/package-summary.html
/usr/share/doc/libplexus-container-default-java/api/org/codehaus/plexus/component/discovery/package-tree.html