/usr/ is in libmaven-source-plugin-java 2.2.1-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/java/
/usr/share/
/usr/share/java/maven-source-plugin.jar
/usr/share/doc/
/usr/share/doc/libmaven-source-plugin-java/
/usr/share/doc/libmaven-source-plugin-java/copyright
/usr/share/doc/libmaven-source-plugin-java/changelog.Debian.gz
/usr/share/maven-repo/
/usr/share/maven-repo/org/
/usr/share/maven-repo/org/apache/
/usr/share/maven-repo/org/apache/maven/
/usr/share/maven-repo/org/apache/maven/plugins/
/usr/share/maven-repo/org/apache/maven/plugins/maven-source-plugin/
/usr/share/maven-repo/org/apache/maven/plugins/maven-source-plugin/2.2.1/
/usr/share/maven-repo/org/apache/maven/plugins/maven-source-plugin/2.2.1/maven-source-plugin-2.2.1.pom
/usr/share/java/maven-source-plugin-2.2.1.jar
/usr/share/maven-repo/org/apache/maven/plugins/maven-source-plugin/2.2.1/maven-source-plugin-2.2.1.jar