org.apache.catalina.util
Classes 
Base64
CharsetMapper
CustomObjectInputStream
DateTool
DefaultAnnotationProcessor
DOMWriter
Enumerator
Extension
ExtensionValidator
FastDateFormat
HexUtils
InstanceSupport
IOTools
LifecycleSupport
ManifestResource
MD5Encoder
MIME2Java
ParameterMap
Queue
RequestUtil
ResourceSet
SchemaResolver
ServerInfo
Strftime
StringManager
StringParser
TomcatCSS
URL
URLEncoder
XMLWriter