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What is Log4j?

It is an open source logging framework. With this tool – logging behavior can be controlled by editing a configuration file only without touching the application binary and can be used to store the Selenium Automation flow logs.
Log4j is a tool in the Logging Tools category of a tech stack.
Log4j is an open source tool with 856 GitHub stars and 519 GitHub forks. Here’s a link to Log4j's open source repository on GitHub

Who uses Log4j?

Companies
3 companies reportedly use Log4j in their tech stacks, including Marstech, MiruServ, and internet-of-things.

Developers
14 developers on StackShare have stated that they use Log4j.

Why developers like Log4j?

Here’s a list of reasons why companies and developers use Log4j
Top Reasons
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Log4j Alternatives & Comparisons

What are some alternatives to Log4j?
SLF4J
It is a simple Logging Facade for Java (SLF4J) serves as a simple facade or abstraction for various logging frameworks allowing the end user to plug in the desired logging framework at deployment time.
Logback
It is intended as a successor to the popular log4j project. It is divided into three modules, logback-core, logback-classic and logback-access. The logback-core module lays the groundwork for the other two modules, logback-classic natively implements the SLF4J API so that you can readily switch back and forth between logback and other logging frameworks and logback-access module integrates with Servlet containers, such as Tomcat and Jetty, to provide HTTP-access log functionality.
Loki
Loki is a horizontally-scalable, highly-available, multi-tenant log aggregation system inspired by Prometheus. It is designed to be very cost effective and easy to operate, as it does not index the contents of the logs, but rather a set of labels for each log stream.
CocoaLumberjack
CocoaLumberjack is a fast & simple, yet powerful & flexible logging framework for Mac and iOS.
Seq
It is the easiest way to collect, search, analyze and alert on structured log data. Structured logging preserves the individual property values, as well as the text, associated with each event.
See all alternatives

Log4j's Followers
13 developers follow Log4j to keep up with related blogs and decisions.
Stephane Robin
John Alton
Mohamma76685757
Lukas Karsten
M-Razavi
Arun Kumar
Johann Burkard
Joanne Antido
Nicolas Ferreira
Francesco Limberti