Apache Log4j

Apache Log4j is a versatile, industrial-grade Java logging framework composed of an API, its implementation, and components to assist deployment for various use cases. It is part of the Apache Logging Services project. Log4j is a Java library distributed as Maven artifacts and is consumed via its Java API rather than over the network; no public HTTP/REST surface is published.

2 APIs 0 Features

ApacheDebuggingJavaLibraryLoggingMonitoringOpen Source

APIs

Log4j API

The logging facade providing a feature-rich Java interface for application logging. Applications code against this stable API while delegating to a backing implementation such a...

Log4j Core

The reference implementation of the Log4j API providing appenders, layouts, filters, lookups and configuration that route log events to consoles, files, databases, network endpo...

Resources

Sources

aid: log4j
name: Apache Log4j
description: >-
  Apache Log4j is a versatile, industrial-grade Java logging framework composed
  of an API, its implementation, and components to assist deployment for various
  use cases. It is part of the Apache Logging Services project. Log4j is a Java
  library distributed as Maven artifacts and is consumed via its Java API rather
  than over the network; no public HTTP/REST surface is published.
type: Index
image: https://kinlane-productions.s3.amazonaws.com/apis-json/apis-json-logo.jpg
tags:
  - Apache
  - Debugging
  - Java
  - Library
  - Logging
  - Monitoring
  - Open Source
url: https://raw.githubusercontent.com/api-evangelist/log4j/refs/heads/main/apis.yml
created: '2024-01-15'
modified: '2026-04-28'
specificationVersion: '0.19'
apis:
  - aid: log4j:log4j-api
    name: Log4j API
    description: >-
      The logging facade providing a feature-rich Java interface for application
      logging. Applications code against this stable API while delegating to a
      backing implementation such as Log4j Core.
    humanURL: https://logging.apache.org/log4j/2.x/manual/api.html
    tags:
      - API
      - Facade
      - Java
      - Logging
    properties:
      - type: Documentation
        url: https://logging.apache.org/log4j/2.x/manual/api.html
      - type: Reference
        url: https://logging.apache.org/log4j/2.x/javadoc.html
      - type: SourceCode
        url: https://github.com/apache/logging-log4j2
  - aid: log4j:log4j-core
    name: Log4j Core
    description: >-
      The reference implementation of the Log4j API providing appenders, layouts,
      filters, lookups and configuration that route log events to consoles,
      files, databases, network endpoints and more.
    humanURL: https://logging.apache.org/log4j/2.x/manual/configuration.html
    tags:
      - Core
      - Implementation
      - Java
      - Logging
    properties:
      - type: Documentation
        url: https://logging.apache.org/log4j/2.x/manual/configuration.html
      - type: Reference
        url: https://logging.apache.org/log4j/2.x/javadoc.html
      - type: SourceCode
        url: https://github.com/apache/logging-log4j2
common:
  - type: Website
    url: https://logging.apache.org/log4j/2.x/
  - type: Documentation
    url: https://logging.apache.org/log4j/2.x/manual/
  - type: GettingStarted
    url: https://logging.apache.org/log4j/2.x/manual/getting-started.html
  - type: Security
    url: https://logging.apache.org/security.html
  - type: ReleaseNotes
    url: https://logging.apache.org/log4j/2.x/release-notes.html
  - type: Performance
    url: https://logging.apache.org/log4j/2.x/performance.html
  - type: SourceCode
    url: https://github.com/apache/logging-log4j2
  - type: License
    url: https://www.apache.org/licenses/LICENSE-2.0
maintainers:
  - FN: Kin Lane
    email: [email protected]