Head First Servlets and JSP, 2nd Edition

Four places the Container looks for TLDs

The Container searches in several places to find TLD files—you don’t need to do anything except make sure your TLDs are in one of the right locations.

1. Directly inside WEB-INF

2. Directly inside a subdirectory of WEB-INF

3. Inside the META-INF directory inside a JAR file that’s inside WEB-INF/lib

4. Inside a sub-directory of META-INF inside a JAR file that’s inside WEB-INF/lib