Rather than merely a sign, it is the root from which we can trace back to our ancestor, the tie that helps bind us to other members of the same clan, the dignity most people hope to live for.

Although the root cause of the error is reported correctly in the stack trace, it's obvious that the Facelets error reporting is an improvement.

The truss command can either execute a specified command or attach to an existing process to produce a trace (assuming that you own the running process or have root privileges).