# Package org.apache.catalina.util

- Class Summary
  Class | Description
  --- | ---
  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.
  CustomObjectInputStream | Custom subclass of `ObjectInputStream` that loads from the class loader for this web application.
  DOMWriter | A DOM writer optimised for use by WebDAV.
  ErrorPageSupport | Provides support for tracking per exception type and per HTTP status code error pages.
  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.
  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 `Lifecycle` interface that implements the state transition rules for `Lifecycle.start()` and `Lifecycle.stop()`
  LifecycleMBeanBase |
  ManifestResource | Representation of a Manifest file and its available extensions and required extensions
  NetMask | A class representing a CIDR netmask.
  ParameterMap<K,V> | Implementation of java.util.Map that includes a `locked` property.
  RequestUtil | General purpose request parsing and encoding utility methods.
  ResourceSet<T> | Extended implementation of HashSet that includes a `locked` property.
  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.
  TLSUtil |
  TomcatCSS |
  ToStringUtil | Utility class used to help generate return values for calls to `Object.toString()`.
  URLEncoder | This class is very similar to the java.net.URLEncoder class.
  XMLWriter | XMLWriter helper class.

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