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