# apache/logging-log4j2

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3,607 stars · 1,727 forks · Java · Apache-2.0

## Links

- GitHub: https://github.com/apache/logging-log4j2
- Homepage: https://logging.apache.org/log4j/2.x
- awesome-repositories: https://awesome-repositories.com/repository/apache-logging-log4j2.md

## Topics

`apache` `api` `java` `jvm` `library` `log4j` `log4j2` `logger` `logging` `syslog`

## Description

This project is a logging framework for Java environments, providing a standardized interface for capturing diagnostic application events and maintaining persistent audit trails. It functions as an enterprise-grade logging engine designed to handle high-throughput applications while managing complex diagnostic data.

The framework distinguishes itself through a modular provider architecture that allows for the dynamic swapping of logging implementations and output destinations. It utilizes a hierarchical configuration system that enables granular control over logging behavior, supported by pluggable formatting components and filter-based routing logic to manage event processing at runtime.

Beyond core logging capabilities, the project includes tools for performance benchmarking to measure resource consumption and identify throughput bottlenecks. It also incorporates automated security testing methodologies, including continuous fuzzing integration, to detect vulnerabilities within its components and layouts.

## Tags

### Programming Languages & Runtimes

- [Java Logging Frameworks](https://awesome-repositories.com/f/programming-languages-runtimes/java-logging-frameworks.md) — Provides a standardized interface for recording runtime information with support for multiple output destinations.

### System Administration & Monitoring

- [Application Logging](https://awesome-repositories.com/f/system-administration-monitoring/diagnostic-tools/diagnostics/telemetry-and-log-collectors/application-logging.md) — Captures diagnostic messages and runtime information from Java applications to create persistent audit trails.
- [Pluggable Logging Backends](https://awesome-repositories.com/f/system-administration-monitoring/pluggable-logging-backends.md) — Functions as a robust logging engine designed for high-throughput applications requiring efficient event processing.
- [Diagnostic Context Propagators](https://awesome-repositories.com/f/system-administration-monitoring/diagnostic-logging/diagnostic-context-propagators.md) — Maintains diagnostic context across asynchronous execution threads for consistent log tracking.
- [Log Event Filtering](https://awesome-repositories.com/f/system-administration-monitoring/log-event-filtering.md) — Evaluates log events against predefined criteria to determine whether messages should be processed or discarded at runtime.
- [Logger Hierarchies](https://awesome-repositories.com/f/system-administration-monitoring/log-management/logger-hierarchies.md) — Manages logging behavior through a tree structure where settings propagate from parent nodes to children.

### Mobile Development

- [Performance Benchmarking](https://awesome-repositories.com/f/mobile-development/android-log-management/logging-performance-optimization/performance-benchmarking.md) — Provides built-in benchmarking tools to measure resource consumption and identify throughput bottlenecks within the logging framework. ([source](https://github.com/apache/logging-log4j2/tree/2.x/log4j-perf-test))

### Software Engineering & Architecture

- [Asynchronous Processing](https://awesome-repositories.com/f/software-engineering-architecture/event-logging/asynchronous-processing.md) — Offloads log event processing to background threads using queues to minimize application latency.
- [Plugin-Based Architectures](https://awesome-repositories.com/f/software-engineering-architecture/plugin-based-architectures.md) — Provides a modular system for dynamically swapping logging implementations and appenders through a standardized interface.