You can find JavaServer Faces content on a URL using this tool.
Java Server Faces (JSF) is a Java-based web application framework intended to simplify development integration of web-based user interfaces. JavaServer Faces is a standardized display technology, which was formalized in a specification through the Java Community Process.
An attacker might use the disclosed information to harvest specific security vulnerabilities for the content identified.
Only use components that do not have known vulnerabilities, only use components that when combined to not introduce a security vulnerability, and ensure that a misconfiguration does not cause any vulnerabilities.