Couldn't find any documentation on Tomcat logging standards, but this feels like an "info" log level issue rather than a warning. The JSP 2.0 spec explicitly defines the following elements that TagLibraryInfoImpl will log warnings for (see section 3-18, Figure JSP.C-4): description, display-name, icon. Can we get the logging from createTagFileInfo() changed to INFO level, please? There's no warning here -- the TLDs are strictly conforming, the fact that jasper doesn't know what to do with these means I'd have to raise my logging threshold, thereby potentially missing messages that actually matter. A better option would be to explicitly check for these three elements and ignore them, thus leaving the log level at warning.
I've added an explicit check for these element names, so that warnings will not be logged for them. Thanks for reporting this.