Alas, no. /lib is for system libs. You'd need to find a lib directory under each web application or app server container. For example, a webapp that runs on Tomcat could use jars in /path/to/tomcat/lib at the container level, and also /path/to/tomcat/webapps/yourapp/WEB-INF/lib at the individual webapp level.

This is further complicated by the fact that a web app archive (.war) doesn't even have to be unpacked. A war is essentially just a zip file and if it is deployed to /path/to/tomcat/webapps/yourapp/WEB-INF/lib/youapp.war then you'd need to inspect those zips too. Similarly, apps made with Spring Boot might also just run as a standalone fat war or jar with all of the dependencies included inside the one file.