Originally reported as happening after Empty All Caches, I just became aware that this same class cast exception occurs in warnings and errors hundreds of times daily in our logs:
Caused by: java.lang.ClassCastException: org.apache.xerces.parsers.XIncludeAwareParserConfiguration cannot be cast to org.apache.xerces.xni.parser.XMLParserConfiguration
See attachment for details.
Tomcat 7.0.42, Windows 7, Linux
Details of ClassCastException.