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Log4j Core provides a flexible and extensible property substitution system.

Using a configuration file is the most popular and recommended approach for configuring Log4j Core. In this page we will examine the composition of a configuration file and how Log4j Core uses it. If you are looking for a quick start on using Log4j in your application or library, please refer to Getting started instead.

In a Jakarta EE environment, there are two possible approaches to logging: Each application can use their own copy of Log4j Core and include log4j-core in the WAR or EAR archive. Applications can also use a single copy of Log4j Core that must be installed globally on the application server. Shared libraries Log events emitted by each application and the libraries bundled with it will be handled by

Asynchronous logging is a technique that improves application logging performance by executing all I/O operations in a separate thread.

This section introduces you to some common concerns shared by almost all predefined layouts that you need to be aware of while using them. In almost any modern production deployment, logs are no more written to files read by engineers while troubleshooting, but forwarded to log ingestion systems (Elasticsearch, Google Cloud Logging, etc.) for several observability use cases ranging from logging to

Appenders targeting files, network sockets, databases, SMTP servers, etc. Layouts that can render CSV, HTML, JSON, Syslog, etc. formatted outputs Filters based on log event rates, regular expressions, scripts, time, etc. Lookups for accessing system properties, environment variables, log event fields, etc. Reliability Log4j is built with solid reliability in mind. It can automatically reload its c

About log4j 1.2 What is log4j? Download FAQ Roadmap Community Mailing Lists Issue Tracking Blog Documentation Introduction JavaDoc Publications Building Wiki Project Documentation Project Information Project Reports End of LifeOn August 5, 2015 the Logging Services Project Management Committee announced that Log4j 1.x had reached end of life. For complete text of the announcement please see the Ap

org.apache.log4j Class PatternLayout java.lang.Object org.apache.log4j.Layout org.apache.log4j.PatternLayout All Implemented Interfaces: OptionHandler public class PatternLayoutextends Layout A flexible layout configurable with pattern string. This code is known to have synchronization and other issues which are not present in org.apache.log4j.EnhancedPatternLayout. EnhancedPatternLayout should be

Apache log4php™ About Download Install Changelog Documentation Quick start Introduction Configuration Loggers Appenders Layouts Filters Renderers API documentation Community Volunteering Contributing Patches Wiki Blog Project Information Continuous Integration Source Repository Dependencies Project License Project Team Issue Tracking Mailing Lists Project Reports Changes Report Surefire Report RAT

Log4PHP is a dormant project of Apache Logging Services as of December 14, 2020. No further support will be provided. Apache log4php™ About Download Install Changelog Documentation Quick start Introduction Configuration Loggers Appenders Layouts Filters Renderers API documentation Community Volunteering Contributing Patches Wiki Blog Project Information Continuous Integration Source Repository Dep

Apache log4net About Download Support Release Notes Release Review License Documentation Features Supported Frameworks Example Apps Config Examples Building FAQ Manual Introduction Installation Configuration Contexts Plugins Repositories Internals For Contributors Repository Project Reports RAT Report Apache Home License Sponsorship Thanks Security Conferences Inserting log requests into the appli

<H2> Frame Alert</H2> <P> This document is designed to be viewed using the frames feature. If you see this message, you are using a non-frame-capable web client. <BR> Link to<A HREF="overview-summary.html">Non-frame version.</A>

Log4j 2 is nominated for the JAX Innovation Awards! Do you like its performance, garbage-free logging, and easy and flexible configuration? Log4j 2 needs your love. Vote for Log4j 2! End of Life On August 5, 2015 the Logging Services Project Management Committee announced that Log4j 1.x had reached end of life. For complete text of the announcement please see the Apache Blog. Users of Log4j 1 are

Appenders targeting files, network sockets, databases, SMTP servers, etc. Layouts that can render CSV, HTML, JSON, Syslog, etc. formatted outputs Filters based on log event rates, regular expressions, scripts, time, etc. Lookups for accessing system properties, environment variables, log event fields, etc. Reliability Log4j is built with solid reliability in mind. It can automatically reload its c

Apache log4net About Download Support Release Notes Release Review License Documentation Features Supported Frameworks Example Apps Config Examples Building FAQ Manual Introduction Installation Configuration Contexts Plugins Repositories Internals For Contributors Repository Project Reports RAT Report Apache Home License Sponsorship Thanks Security Conferences Overview This document presents examp

Apache Log4cxx is a logging framework for C++ patterned after Apache log4j, which uses Apache Portable Runtime for most platform-specific code and should be usable on any platform supported by APR. Apache Log4cxx is licensed under the Apache License, an open source license certified by the Open Source Initiative. Experience indicates that almost every large application needs runtime configurable l

The Apache Logging Services project creates and maintains open-source software related to the logging of application behavior and released at no charge to the public.

Log4PHP is a dormant project of Apache Logging Services as of December 14, 2020. No further support will be provided. Apache log4php™ About Download Install Changelog Documentation Quick start Introduction Configuration Loggers Appenders Layouts Filters Renderers API documentation Community Volunteering Contributing Patches Wiki Blog Project Information Continuous Integration Source Repository Dep

Apache log4net About Download Support Release Notes Release Review License Documentation Features Supported Frameworks Example Apps Config Examples Building FAQ Manual Introduction Installation Configuration Contexts Plugins Repositories Internals For Contributors Repository Project Reports RAT Report Apache Home License Sponsorship Thanks Security Conferences What is Apache log4net™ The Apache lo

Appenders targeting files, network sockets, databases, SMTP servers, etc. Layouts that can render Text, XML, JSON, Syslog, etc. formatted outputs Filters based on log levels, regular expressions, etc. Reliability log4net is built with solid reliability in mind. It can automatically reload its configuration upon modification and will do so without losing log events while reconfiguration occurs. Per