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Overview
Apache Log4j is a Java logging framework composed of an API, an implementation, and deployment components for multiple use cases. It separates application logging calls from destinations, formats, rolling behavior, and other backend configuration.
Features and best fit
Based on official documentation; not hands-on tested · Content checked:
Key features
Separate the logging API from backend configuration
The README describes Log4j as an industrial-grade Java logging framework composed of an API, its implementation, and supporting components.
Sources: [2]
Configure destinations, layouts, and rolling behavior through appenders and backend settings
Backend configuration can control where logs are sent and how they are formatted or rotated without requiring major changes to application logging calls.
Sources: [2]
Best fit
Fits Java services standardizing logging policy across modules
It provides a common foundation for logger APIs, output formats, file rotation, error handling, and integration with observability pipelines.
Sources: [2]
Before adoption
Continuously track security advisories and patch releases
Logging frameworks are broadly embedded in applications, making version hygiene important. Version 2.26.1 fixes RollingFileAppender behavior, JSON encoding, resource leaks, KafkaAppender retry handling, and related issues.
Sources: [3]
Official sources
- [1]apache/logging-log4j2 — GitHub repository(2026-10-06)
- [2]Apache Log4j — README(2026-10-06)
- [3]Apache Log4j 2.26.1 release(2026-10-06)
Supplemental curator note
It fits Java applications that want one logging API/backend with configurable destinations and formats. Track security advisories and dependency versions continuously and avoid enabling unnecessary appenders or plugins.
Try it in 3 steps
- 1
Get the source
git clone --depth 1 https://github.com/apache/logging-log4j2.git - 2
Enter the repository
cd logging-log4j2 - 3
Check the official steps
Continue with the commands in the README Installation, Quick Start, or Getting Started section.
find . -maxdepth 1 -iname 'README*' -exec sed -n '1,220p' {} \; -quit
Growth
Growth trends · Last 30 days
3,634 Stars
Trend data is still being collected.
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Categories and tags
Categories
GitHub data
GitHub dataView detailed GitHub data
GitHub Topics
- apache
- api
- java
- jvm
- library
- log4j
- log4j2
- logger
- logging
- syslog
- Stars
- 3,634
- Forks
- 1,748
- Watchers
- 3,634
- Open issues
- 228
- Contributors
- 268
- Owner type
- Organization
- Primary language
- Java
- License
- Apache-2.0
- Repository last updated
- Oct 6, 2026
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