# Package org.apache.catalina.util

Class Summary
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.
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.
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
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.
TimeBucketCounter: this class maintains a thread safe hash map that has timestamp-based buckets followed by a string for a key, and a counter for a value. each time the increment() method is called it adds the key if it does not exist, increments its value and returns it.
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.