Top 9 Java Log4j2 Projects

Apache Log4j 2

1 109 3,520 9.6 Java

Apache Log4j is a versatile, feature-rich, efficient logging API and backend for Java.

Project mention: Most Effective Approaches for Debugging Applications | dev.to | 2025-04-27

Structured logging transforms debugging by providing a detailed, searchable record of an application’s state, including variable values, stack traces, and user actions. According to Gartner, organizations with robust logging systems resolve production issues 40% faster. Doug Crawford, President and Founder of Best Trade Schools, highlights their value: “Implementing a structured logging system… makes isolating the problem straightforward.” Tools like Sentry for real-time error tracking, Log4j for Java applications, or ELK Stack for log aggregation enable developers to pinpoint issues quickly, reducing the need for manual reproduction. For example, Sentry’s breadcrumb feature captures user actions leading to an error, offering a clear debugging trail.
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CVE-2021-44228-Scanner

2 17 857 0.0 Java

Vulnerability scanner and mitigation patch for Log4j2 CVE-2021-44228
Automon

3 0 572 9.6 Java

Automon combines the power of AOP (AspectJ) with monitoring or logging tools you already use to declaratively trace and monitor your Java code, the JDK, and 3rd party libraries.
LogCaptor

4 5 411 8.6 Java

🎯 LogCaptor captures log entries for unit and integration testing purposes
blacklite

5 2 64 0.0 Java

"Fast as internal ring buffer" Logback/Log4J2 appender using SQLite with zstandard dictionary compression and rollover.
Log4JShell-Bytecode-Detector

6 4 49 0.0 Java

Local Bytecode Scanner for the Log4JShell Vulnerability (CVE-2021-44228)
Log4jPatcher

7 2 48 0.0 Java

A mitigation for CVE-2021-44228 (log4shell) that works by patching the vulnerability at runtime. (Works with any vulnerable java software, tested with java 6 and newer)
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mdc4spring

8 1 21 5.0 Java

Declarative Logging Mapping Diagnostic Context for Spring.
yaslf4j

9 1 1 1.8 Java

yet another simple logging facade for java

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).

Java Log4j2 discussion

Java Log4j2 related posts

find what log4j version windows server 2019 running

1 project | /r/sysadmin | 21 May 2022
Update latest bios legion 5 pro?

1 project | /r/LenovoLegion | 26 Apr 2022
Detecting log4j on macos with Microsoft PowerShell

1 project | /r/techsupport | 7 Jan 2022
Any free tool to scan for Log4Shell and Log4j vulnerabilities?

2 projects | /r/sysadmin | 4 Jan 2022
Help using command line scanner for Logj4 vulnerabilities

1 project | /r/synology | 29 Dec 2021
So many different log4j scanner tools and scripts posted

2 projects | /r/sysadmin | 28 Dec 2021
Horizon Client and log4j

1 project | /r/VMwareHorizon | 28 Dec 2021
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Index

What are some of the best open-source Log4j2 projects in Java? This list will help you:

#	Project	Stars
1	Apache Log4j 2	3,520
2	CVE-2021-44228-Scanner	857
3	Automon	572
4	LogCaptor	411
5	blacklite	64
6	Log4JShell-Bytecode-Detector	49
7	Log4jPatcher	48
8	mdc4spring	21
9	yaslf4j	1