/usr/share/maven-repo/org/postgresql/ is in libpostgresql-jdbc-java 9.4.1212-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/maven-repo/org/postgresql/pgjdbc-aggregate/
/usr/share/maven-repo/org/postgresql/pgjdbc-aggregate/9.4.1212/
/usr/share/maven-repo/org/postgresql/pgjdbc-aggregate/9.4.1212/pgjdbc-aggregate-9.4.1212.pom
/usr/share/maven-repo/org/postgresql/pgjdbc-aggregate/debian/
/usr/share/maven-repo/org/postgresql/pgjdbc-aggregate/debian/pgjdbc-aggregate-debian.pom
/usr/share/maven-repo/org/postgresql/postgresql/
/usr/share/maven-repo/org/postgresql/postgresql/9.4.1212/
/usr/share/maven-repo/org/postgresql/postgresql/9.4.1212/postgresql-9.4.1212.jar
/usr/share/maven-repo/org/postgresql/postgresql/9.4.1212/postgresql-9.4.1212.pom
/usr/share/maven-repo/org/postgresql/postgresql/debian/
/usr/share/maven-repo/org/postgresql/postgresql/debian/postgresql-debian.jar
/usr/share/maven-repo/org/postgresql/postgresql/debian/postgresql-debian.pom