/usr/share/tomcat7/lib/tomcat-jdbc.jar is in libtomcat7-java 7.0.52-1ubuntu0.16.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/tomcat7/lib/../../java/tomcat-jdbc-7.0.52.jar
/usr/share/tomcat7/lib/../../java/tomcat-jdbc-7.0.52.jar