Package org.apache.log4j
package org.apache.log4j
The main log4j package.
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ClassDescriptionImplement this interface for your own strategies for outputting log statements.Abstract superclass of the other appenders in the package.The AsyncAppender lets users log events asynchronously.Use this class to quickly configure the package.This class has been deprecated and replaced by the
Logger
subclass.ConsoleAppender appends log events toSystem.out
orSystem.err
using a layout specified by the user.DailyRollingFileAppender extendsFileAppender
so that the underlying file is rolled over at a user chosen frequency.Default implementation of ThrowableRenderer using Throwable.printStackTrace.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.Enhanced implementation of ThrowableRenderer.FileAppender appends log events to a file.This class is specialized in retrieving loggers by name and also maintaining the logger hierarchy.This layout outputs events in a HTML table.Extend this abstract class to create your own log layout format.Defines the minimum set of levels recognized by the system, that isOFF
,FATAL
,ERROR
,WARN
,INFO
,DEBUG
andALL
.This is the central class in the log4j package.Use theLogManager
class to retreiveLogger
instances or to operate on the currentLoggerRepository
.This class provides parameterized logging services using the pattern syntax of java.text.MessageFormat.This class provides parameterized logging services using the SLF4J pattern syntax.This is a base class for LogMF and LogSF parameterized logging classes.The MDC class is similar to theNDC
class except that it is based on a map instead of a stack.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.A flexible layout configurable with pattern string.Refrain from using this class directly, use theLevel
class instead.Allows the configuration of log4j from an external file.RollingFileAppender extends FileAppender to backup the log files when they reach a certain size.SimpleLayout consists of the level of the log statement, followed by " - " and then the log message itself.TTCC layout format consists of time, thread, category and nested diagnostic context information, hence the name.WriterAppender appends log events to aWriter
or anOutputStream
depending on the user's choice.