org.apache.catalina.util
Classes 
Base64
CharsetMapper
ContextName
Conversions
CustomObjectInputStream
DateTool
DOMWriter
Enumerator
Extension
ExtensionValidator
InstanceSupport
IOTools
LifecycleBase
LifecycleMBeanBase
LifecycleSupport
ManifestResource
MD5Encoder
MIME2Java
ParameterMap
RequestUtil
ResourceSet
SchemaResolver
ServerInfo
SessionConfig
SessionIdGenerator
Strftime
StringParser
TomcatCSS
URLEncoder
XMLWriter