| Class | Description | 
|---|---|
| Base64 | Deprecated Use  Base64This class will be removed in Tomcat 8. | 
| CharsetMapper | Utility class that attempts to map from a Locale to the corresponding
 character set to be used for interpreting input text (or generating
 output text) when the Content-Type header does not include one. | 
| ConcurrentDateFormat | Deprecated Unused. | 
| ContextName | Utility class to manage context names so there is one place where the
 conversions between baseName, path and version take place. | 
| Conversions | |
| CustomObjectInputStream | Custom subclass of  ObjectInputStreamthat loads from the
 class loader for this web application. | 
| DateTool | Deprecated Mostly unused and will be removed in 8.0.x onwards | 
| DOMWriter | A sample DOM writer. | 
| Enumerator<T> | Deprecated Replaced by java.util.Collections#enumeration(..) | 
| Extension | Utility class that represents either an available "Optional Package"
 (formerly known as "Standard Extension") as described in the manifest
 of a JAR file, or the requirement for such an optional package. | 
| ExtensionValidator | Ensures that all extension dependencies are resolved for a WEB application
 are met. | 
| InstanceSupport | Support class to assist in firing InstanceEvent notifications to
 registered InstanceListeners. | 
| Introspection | Provides introspection utilities that either require knowledge of Tomcat
 internals or are solely used by Tomcat internals. | 
| IOTools | Contains commonly needed I/O-related methods | 
| LifecycleBase | Base implementation of the  Lifecycleinterface that implements the
 state transition rules forLifecycle.start()andLifecycle.stop() | 
| LifecycleMBeanBase | |
| LifecycleSupport | Deprecated Unused. | 
| ManifestResource | Representation of a Manifest file and its available extensions and
  required extensions | 
| MIME2Java | MIME2Java is a convenience class which handles conversions between MIME charset names
 and Java encoding names. | 
| NetMask | A class representing a CIDR netmask. | 
| ParameterMap<K,V> | Implementation of java.util.Map that includes a
  lockedproperty. | 
| RequestUtil | General purpose request parsing and encoding utility methods. | 
| ResourceSet<T> | Extended implementation of HashSet that includes a
  lockedproperty. | 
| SchemaResolver | Deprecated Use  LocalResolver | 
| ServerInfo | Simple utility module to make it easy to plug in the server identifier
 when integrating Tomcat. | 
| SessionConfig | |
| SessionIdGeneratorBase | |
| StandardSessionIdGenerator | |
| Strftime | Converts dates to strings using the same format specifiers as strftime
 Note: This does not mimic strftime perfectly. | 
| StringParser | Utility class for string parsing that is higher performance than
 StringParser for simple delimited text cases. | 
| TomcatCSS | |
| URLEncoder | This class is very similar to the java.net.URLEncoder class. | 
| XMLWriter | XMLWriter helper class. | 
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