[MNG-5961] Maven possibly not aware of log4j2

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.3.9
• Fix Version/s: 3.5.0-alpha-1, 3.5.0
• Component/s: Logging
• Assignee: Arnaud Heritier
• Reporter: Mike Drob
• Created: 13/Jan/16 17:36
• Updated: 28/Mar/20 15:00
• Resolved: 05/Feb/17 23:29

Description

Using a fresh install of maven 3.3.9 I followed the steps at https://garygregory.wordpress.com/2015/03/23/watch-maven-in-color to add color highlighting to my output. Everything works as expected, however on all usages I would get the warning:

[WARN] The SLF4J binding actually used is not supported by Maven: org.apache.logging.slf4j.Log4jLoggerFactory
[WARN] Maven supported bindings are:
[WARN] (from jar:file:/opt/apache-maven-3.3.9/lib/maven-embedder-3.3.9.jar!/META-INF/maven/slf4j-configuration.properties)
- ch.qos.logback.classic.LoggerContext
- org.slf4j.helpers.Log4jLoggerFactory
- org.slf4j.impl.SimpleLoggerFactory

This looks pretty harmless, and I was able to suppress it by manually adding the line

org.apache.logging.slf4j.Log4jLoggerFactory org.apache.maven.cli.logging.impl.Log4j2Configuration

to /META-INF/maven/slf4j-configuration.properties in maven-embedder-3.3.9.jar.

I'm not sure that this is a "correct" solution, and I'm not even confident I could explain what effect it has, hence not posting a patch, but somebody with more knowledge might be able to triage this better. Or offer an "official" way to do colorized output.

Issue Links

• is required by: MNG-3507 ANSI color logging for improved output visibility
• links to: GitHub Pull Request #104