The main log4j package.


Appender Implement this interface for your own strategies for outputting log statements. 


AppenderSkeleton Abstract superclass of the other appenders in the package. 
AsyncAppender The AsyncAppender lets users log events asynchronously. 
BasicConfigurator Use this class to quickly configure the package. 
Category This class has been deprecated and replaced by the Logger subclass
ConsoleAppender ConsoleAppender appends log events to System.out or System.err using a layout specified by the user. 
DailyRollingFileAppender DailyRollingFileAppender extends FileAppender so that the underlying file is rolled over at a user chosen frequency. 
DefaultThrowableRenderer Default implementation of ThrowableRenderer using Throwable.printStackTrace. 
EnhancedPatternLayout This class is an enhanced version of org.apache.log4j.PatternLayout which was originally developed as part of the abandoned log4j 1.3 effort and has been available in the extras companion. 
EnhancedThrowableRenderer Enhanced implementation of ThrowableRenderer. 
FileAppender FileAppender appends log events to a file. 
Hierarchy This class is specialized in retrieving loggers by name and also maintaining the logger hierarchy. 
HTMLLayout This layout outputs events in a HTML table. 
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, INFODEBUG and ALL
Logger This is the central class in the log4j package. 
LogManager Use the LogManager class to retreive Logger instances or to operate on the current LoggerRepository
LogMF This class provides parameterized logging services using the pattern syntax of java.text.MessageFormat. 
LogSF This class provides parameterized logging services using the SLF4J pattern syntax. 
LogXF This is a base class for LogMF and LogSF parameterized logging classes. 
MDC The MDC class is similar to the NDC class except that it is based on a map instead of a stack. 
NDC The 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. 
PatternLayout A flexible layout configurable with pattern string. 
Priority Refrain from using this class directly, use the Level class instead
PropertyConfigurator Allows the configuration of log4j from an external file. 
RollingFileAppender RollingFileAppender extends FileAppender to backup the log files when they reach a certain size. 
SimpleLayout SimpleLayout consists of the level of the log statement, followed by " - " and then the log message itself. 
TTCCLayout TTCC layout format consists of time, thread, category and nested diagnostic context information, hence the name. 
WriterAppender WriterAppender appends log events to a or an depending on the user's choice.