org.apache.catalina.util
Classes 
Base64
CGIProcessEnvironment
CharsetMapper
CookieTools
CustomObjectInputStream
DateTool
DOMWriter
Enumerator
FastDateFormat
HexUtils
InstanceSupport
LifecycleSupport
MD5Encoder
MIME2Java
ParameterMap
ProcessEnvironment
ProcessHelper
Queue
RequestUtil
ResourceSet
StringManager
StringParser
URL
XMLWriter