# Package org.apache.catalina.util

- Class Summary
  Class | Description
  --- | ---
  Base64 | Deprecated Use `Base64` This 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.
  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 `ObjectInputStream` that 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 `Lifecycle` interface that implements the state transition rules for `Lifecycle.start()` and `Lifecycle.stop()`
  LifecycleMBeanBase |
  LifecycleSupport | Support class to assist in firing LifecycleEvent notifications to registered LifecycleListeners.
  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.
  ParameterMap<K,V> | Extended implementation of HashMap 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.
  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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