| AbsoluteTimeDateFormat | Formats a date in the format HH:mm:ss,SSS for example, "15:49:37,459" |
| Action | A file system action performed as part of a rollover event |
| AndFilter | A filter that 'and's the results of any number of contained filters together |
| Appender | Implement this interface for your own strategies for outputting log statements |
| AppenderAttachable | This Interface is for attaching Appenders to objects |
| AppenderAttachableImpl | |
| AppenderSkeleton | Implementation base class for all appenders |
| APRInitializer | |
| AsyncAppender | The AsyncAppender lets users log events asynchronously |
| BasicConfigurator | Use this class to quickly configure the package |
| BindException | Signals that an error occurred while attempting to bind a socket to a local address and port |
| BufferedOutputStream | Abstract class for writing to character streams |
| BufferedWriter | Writes text to a character-output stream buffering requests to increase efficiency |
| ByteArrayInputStream | InputStream implemented on top of a byte array |
| ByteArrayOutputStream | OutputStream implemented on top of std::vector |
| ByteBuffer | A byte buffer |
| CachedDateFormat | |
| CharMessageBuffer | This class is used by the LOG4CXX_INFO and similar macros to support insertion operators in the message parameter |
| CharsetDecoder | An abstract engine to transform a sequences of bytes in a specific charset into a LogString |
| CharsetEncoder | An engine to transform LogStrings into bytes for the specific character set |
| Class | |
| ClassNamePatternConverter | Formats the class name of the site of the logging request |
| ClassNotFoundException | Thrown when an application tries to load in a class through its string name but no definition for the class with the specified name could be found |
| ClassRegistration | |
| ClosedChannelException | |
| Condition | This class provides a means for one thread to suspend exception until notified by another thread to resume |
| Configurator | Implemented by classes capable of configuring log4j using a URL |
| ConnectException | Signals that an error occurred while attempting to connect a socket to a remote address and port |
| ConsoleAppender | ConsoleAppender appends log events to stdout or stderr using a layout specified by the user |
| CyclicBuffer | CyclicBuffer is used by other appenders to hold instances of LoggingEvent for immediate or deferred display |
| DailyRollingFileAppender | DailyRollingFileAppender extends FileAppender so that the underlying file is rolled over at a user chosen frequency |
| DatagramPacket | This class represents a datagram packet |
| DatagramSocket | This class represents a socket for sending and receiving datagram packets |
| Date | Simple transcoder for converting between external char and wchar_t strings and internal strings |
| DateFormat | DateFormat is an abstract class for date/time formatting patterned after java.text.DateFormat |
| DateLayout | This abstract layout takes care of all the date related options and formatting work |
| DatePatternConverter | Convert and format the event's date in a StringBuffer |
| DateTimeDateFormat | Formats a date in the format dd MMM yyyy HH:mm:ss,SSS for example, "06 Nov 1994 15:49:37,459" |
| DefaultConfigurator | Configures the repository from environmental settings and files |
| DefaultLoggerFactory | |
| DefaultRepositorySelector | |
| DenyAllFilter | This filter drops all logging events |
| DOMConfigurator | Use this class to initialize the log4cxx environment using a DOM tree |
| DOMException | |
| ErrorCode | |
| ErrorHandler | Appenders may delegate their error handling to ErrorHandlers |
| Exception | The class Exception and its subclasses indicate conditions that a reasonable application might want to catch |
| ExpressionFilter | A filter supporting complex expressions - supports both infix and postfix expressions (infix expressions must first be converted to postfix prior to processing) |
| FallbackErrorHandler | The FallbackErrorHandler implements the ErrorHandler interface such that a secondary appender may be specified |
| File | An abstract representation of file and directory path names |
| FileAppender | FileAppender appends log events to a file |
| FileDatePatternConverter | Formats an date by delegating to DatePatternConverter |
| FileInputStream | InputStream implemented on top of APR file IO |
| FileLocationPatternConverter | Return the event's line location information in a StringBuffer |
| FileOutputStream | OutputStream implemented on top of APR file IO |
| FileRenameAction | |
| FileWatchdog | Check every now and then that a certain file has not changed |
| Filter | Users should extend this class to implement customized logging event filtering |
| FilterBasedTriggeringPolicy | FilterBasedTriggeringPolicy determines if rolling should be triggered by evaluating the current message against a set of filters |
| FixedWindowRollingPolicy | When rolling over, FixedWindowRollingPolicy renames files according to a fixed window algorithm as described below |
| FormattingInfo | Modifies the output of a pattern converter for a specified minimum and maximum width and alignment |
| FullLocationPatternConverter | Format the event's line location information |
| GZCompressAction | |
| Hierarchy | This class is specialized in retrieving loggers by name and also maintaining the logger hierarchy |
| HierarchyEventListener | Listen to events occuring within a Hierarchy |
| HTMLLayout | This layout outputs events in a HTML table |
| IllegalArgumentException | Thrown to indicate that a method has been passed an illegal or inappropriate argument |
| IllegalMonitorStateException | |
| IllegalStateException | |
| InetAddress | |
| InputStream | Abstract class for reading from character streams |
| InputStreamReader | Class for reading from character streams |
| InstantiationException | Thrown when an application tries to create an instance of a class using the newInstance method in class Class, but the specified class object cannot be instantiated because it is an interface or is an abstract class |
| Integer | |
| IntegerPatternConverter | Formats an integer |
| InterruptedException | |
| InterruptedIOException | Signals that an I/O operation has been interrupted |
| IOException | Signals that an I/O exception of some sort has occurred |
| ISO8601DateFormat | Formats a date in the format yyyy-MM-dd HH:mm:ss,SSS for example "1999-11-27 15:49:37,459" |
| Layout | Extend this abstract class to create your own log layout format |
| Level | Defines the minimum set of levels recognized by the system, that is OFF, FATAL, ERROR, WARN, INFO, DEBUG and ALL |
| Level::LevelClass | |
| LevelMatchFilter | This is a very simple filter based on level matching |
| LevelPatternConverter | Return the event's level in a StringBuffer |
| LevelRangeFilter | This is a very simple filter based on level matching, which can be used to reject messages with priorities outside a certain range |
| LineLocationPatternConverter | Format the event's line location information |
| LineSeparatorPatternConverter | Formats a line separator |
| LiteralPatternConverter | Formats a string literal |
| Loader | |
| Locale | |
| LocationInfo | This class represents the location of a logging statement |
| LocationInfoFilter | Location information is usually specified at the appender level - all events associated with an appender either create and parse stack traces or they do not |
| Logger | This is the central class in the log4cxx package |
| LoggerFactory | Implement this interface to create new instances of Logger or a sub-class of Logger |
| LoggerPatternConverter | Formats a logger name |
| LoggerRepository | A LoggerRepository is used to create and retrieve Loggers |
| LoggingEvent | The internal representation of logging events |
| LoggingEventPatternConverter | LoggingEventPatternConverter is a base class for pattern converters that can format information from instances of LoggingEvent |
| LogLog | This class used to output log statements from within the log4cxx package |
| LogManager | Use the LogManager class to retreive Logger instances or to operate on the current LoggerRepository |
| logstream | An STL-like stream API for log4cxx using char as the character type |
| logstream_base | Base class for the basic_logstream template which attempts to emulate std::basic_ostream but attempts to short-circuit unnecessary operations |
| ManualTriggeringPolicy | ManualTriggeringPolicy only rolls over on explicit calls to RollingFileAppender.rollover() |
| MapFilter | |
| MDC | Similar to the NDC class except that it is based on a map instead of a stack |
| MessageBuffer | This class is used by the LOG4CXX_INFO and similar macros to support insertion operators in the message parameter |
| MessagePatternConverter | Formats the message of an logging event |
| MethodLocationPatternConverter | Return the event's line location information in a StringBuffer |
| MissingResourceException | |
| Mutex | |
| MutexException | |
| NameAbbreviator | NameAbbreviator generates abbreviated logger and class names |
| NamePatternConverter | Base class for other pattern converters which can return only parts of their name |
| NDC | Ndc class implements nested diagnostic contexts as defined by neil harrison in the article "patterns for logging diagnostic messages" part of the book "pattern languages of program design 3" edited by martin et al |
| NDCPatternConverter | Return the event's NDC in a StringBuffer |
| NoSuchElementException | |
| NTEventLogAppender | Appends log events to NT EventLog |
| NullPointerException | Thrown when an application attempts to use null in a case where an object is required |
| Object | Base class for java-like objects |
| Object::ClazzObject | |
| ObjectImpl | Implementation class for Object |
| ObjectOutputStream | Emulates java serialization |
| ObjectPtrBase | |
| ObjectPtrT | Smart pointer to a Object descendant |
| ODBCAppender | |
| OnlyOnceErrorHandler | The OnlyOnceErrorHandler implements log4cxx's default error handling policy which consists of emitting a message for the first error in an appender and ignoring all following errors |
| OptionConverter | A convenience class to convert property values to specific types |
| OptionHandler | A string based interface to configure package components |
| OutputDebugStringAppender | |
| OutputStream | Abstract class for writing to character streams |
| OutputStreamWriter | Abstract class for writing to character streams |
| PatternConverter | |
| PatternLayout | A flexible layout configurable with pattern string |
| PatternParser | Most of the work of the PatternLayout class is delegated to the PatternParser class |
| Pool | |
| PoolException | |
| Properties | |
| PropertiesPatternConverter | Able to handle the contents of the LoggingEvent's Property bundle and either output the entire contents of the properties in a similar format to the java.util.Hashtable.toString(), or to output the value of a specific key within the property bundle when this pattern converter has the option set |
| PropertyConfigurator | Allows the configuration of log4cxx from an external file |
| PropertyFilter | NOTE: This filter modifies logging events by adding properties to the event |
| PropertyResourceBundle | PropertyResourceBundle is a concrete subclass of ResourceBundle that manages resources for a locale using a set of static strings from a property file |
| PropertySetter | General purpose Object property setter |
| Reader | Abstract class for reading from character streams |
| RelativeTimeDateFormat | Formats a date by printing the number of seconds elapsed since the start of the application |
| RelativeTimePatternConverter | Format the relative time in milliseconds |
| RepositorySelector | The LogManager uses one (and only one) RepositorySelector implementation to select the LoggerRepository for a particular application context |
| ResourceBundle | Resource bundles contain locale-specific objects |
| RollingFileAppender | RollingFileAppender extends log4cxx::FileAppender to backup the log files depending on RollingPolicy and TriggeringPolicy |
| RollingFileAppender | RollingFileAppender extends FileAppender to backup the log files when they reach a certain size |
| RollingFileAppenderSkeleton | Base class for log4cxx::rolling::RollingFileAppender and log4cxx::RollingFileAppender (analogues of org.apache.log4j.rolling.RFA from extras companion and org.apache.log4j.RFA from log4j 1.2, respectively) |
| RollingPolicy | A RollingPolicy is responsible for performing the rolling over of the active log file |
| RollingPolicyBase | Implements methods common to most, it not all, rolling policies |
| RolloverDescription | |
| RootLogger | RootLogger sits at the top of the logger hierachy |
| RuntimeException | RuntimeException is the parent class of those exceptions that can be thrown during the normal operation of the process |
| ServerSocket | |
| SimpleDateFormat | Concrete class for formatting and parsing dates in a locale-sensitive manner |
| SimpleLayout | SimpleLayout consists of the level of the log statement, followed by " - " and then the log message itself |
| SizeBasedTriggeringPolicy | SizeBasedTriggeringPolicy looks at size of the file being currently written to |
| SMTPAppender | Send an e-mail when a specific logging event occurs, typically on errors or fatal errors |
| Socket | |
| SocketAppender | Sends LoggingEvent objects to a remote a log server, usually Apache Chainsaw |
| SocketAppenderSkeleton | Abstract base class for SocketAppender and XMLSocketAppender |
| SocketException | Thrown to indicate that there is an error in the underlying protocol, such as a TCP error |
| SocketHubAppender | Sends LoggingEvent objects to a set of remote log servers, usually a SocketNode |
| SocketOutputStream | |
| SocketTimeoutException | Signals that an I/O operation has been interrupted |
| SQLException | |
| StrftimeDateFormat | Concrete class for formatting and parsing dates in a locale-sensitive manner |
| StrictMath | The class StrictMath contains methods for performing basic numeric operations |
| StringHelper | String manipulation routines |
| StringMatchFilter | This is a very simple filter based on string matching |
| StringTokenizer | |
| synchronized | Utility class for objects multi-thread synchronization |
| SyslogAppender | Use SyslogAppender to send log messages to a remote syslog daemon |
| SyslogWriter | SyslogWriter is a wrapper around the DatagramSocket class it writes text to the specified host on the port 514 (UNIX syslog) |
| System | Several useful class fields and methods |
| SystemErrWriter | Abstract class for writing to character streams |
| SystemOutWriter | Abstract class for writing to character streams |
| TelnetAppender | |
| Thread | This class implements an approximation of java.util.Thread |
| ThreadException | |
| ThreadLocal | This class provides thread-local variables |
| ThreadPatternConverter | Formats the event thread name |
| ThreadSpecificData | This class contains all the thread-specific data in use by log4cxx |
| ThrowableInformationPatternConverter | Outputs the ThrowableInformation portion of the LoggingiEvent as a full stacktrace unless this converter's option is 'short', where it just outputs the first line of the trace |
| TimeBasedRollingPolicy | TimeBasedRollingPolicy is both easy to configure and quite powerful |
| TimeZone | |
| Transcoder | Simple transcoder for converting between external char and wchar_t strings and internal strings |
| TranscoderException | |
| Transform | Utility class for transforming strings |
| TriggeringEventEvaluator | Implementions of this interface allow certain appenders to decide when to perform an appender specific action |
| TriggeringPolicy | A TriggeringPolicy controls the conditions under which rollover occurs |
| TTCCLayout | TTCC layout format consists of time, thread, logger name and nested diagnostic context information, hence the name |
| ulogstream | An STL-like stream API for log4cxx using UniChar as the character type |
| UniCharMessageBuffer | This class is designed to support insertion operations in the message argument to the LOG4CXX_INFO and similar macros and is not designed for general purpose use |
| UnknownHostException | |
| WideMessageBuffer | This class is designed to support insertion operations in the message argument to the LOG4CXX_INFO and similar macros and is not designed for general purpose use |
| wlogstream | An STL-like stream API for log4cxx using wchar_t as the character type |
| Writer | Abstract class for writing to character streams |
| WriterAppender | WriterAppender appends log events to a standard output stream |
| XMLDOMDocument | The XMLDOMDocument interface represents an entire XML document |
| XMLDOMElement | The XMLDOMElement interface represents an element in an XML document |
| XMLDOMNode | The XMLDOMNode interface is the primary datatype for the entire Document Object Model |
| XMLDOMNodeList | The XMLDOMNodeList interface provides the abstraction of an ordered collection of nodes, without defining or constraining how this collection is implemented |
| XMLLayout | The output of the XMLLayout consists of a series of log4j:event elements |
| XMLSocketAppender | Sends LoggingEvent objects in XML format to a remote a log server, usually a XMLSocketNode |
| ZipCompressAction | |