Two recent JSF tablibs are not shipped with the implementation JAR:

• Passthrough - "http://xmlns.jcp.org/jsf/passthrough"
• Friendly Markup - "http://xmlns.jcp.org/jsf"

This doesn't cause any runtime problem, but the IDEs are not able to interpret the XML tags, showing warnings and not giving code suggestions.

In-depth details can be found in Stackoverflow: https://stackoverflow.com/q/40865120