Enhance http://svn.apache.org/viewvc?rev=646543&view=rev

Enhance svn.apache.org/viewvc?rev=646543&view=rev
Don't drop the error silently. Instead use the root logger
already initialized for the system class loader
to write out a warning.
Backport to TC 5.5 will need a couple of casts because
of the lack of generics and the use of HashMaps.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@691675 13f79535-47bb-0310-9956-ffa450edef68