Debian usage of Tomcat Native Library ===================================== Enable Tomcat Native Library in Tomcat 8.x: - edit /etc/tomcat8/server.xml to check if AprLifecycleListener is activated [you should remove XML comments if present] - start or restart Tomcat by using: service tomcat8 restart Check library loading at Tomcat 8.x startup: - when starting, Tomcat will output the following log message to a file named like /var/log/tomcat8/catalina.*.log --- INFO [main] Loaded APR based Apache Tomcat Native library [1.2.14] using APR version [1.6.2]. INFO [main] APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true]. INFO [main] APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true] INFO [main] OpenSSL successfully initialized [OpenSSL 1.1.0f 25 May 2017] --- If you are using Tomcat 9.x, follow the instructions above, replacing tomcat8 with tomcat9.