apache/logging-log4j2

Health v2 · maintenance only

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Adoption not part of the score

3614 stars · 1733 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Apache Log4j 2 is an industrial-grade Java logging framework consisting of a feature-rich logging API (Log4j API) and a high-performance implementation (Log4j Core). It supports appenders for files, sockets, databases, and SMTP, multiple output layouts, filters, lookups, hot config reloading, and extensive plugin-based extensibility.

Use cases

• add structured logging to a Java application
• replace System.out.println with a proper logging framework
• route logs from SLF4J or JUL to a single backend
• write logs to files, databases, or syslog in Java
• configure log levels and formats via log4j2.xml
• use Log4j Core as the logging backend in Spring Boot
• migrate from Log4j 1 or Logback

When to choose

• you need a mature, actively maintained logging backend for JVM applications
• you want a logging facade with rich message types and lambda support
• you need high-throughput, garbage-collector-friendly logging
• you need flexible appenders, layouts, and filters out of the box

When to avoid

• you are not on the JVM platform
• you need a minimal zero-dependency logging solution
• your project is locked to Log4j 1.x APIs without migration effort

Facets

library · maturity stable

logging monitoring plugin-system developer-tools backend monitoring jvm cross-platform log4j2 logging-framework java apache slf4j appender log-configuration

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