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https://issues.apache.org/jira/browse/MNG-5835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14576707#comment-14576707
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Joseph Walton commented on MNG-5835:
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bq. However, I just created a slightly changed hello-maven-plugin
Don't do that ;-)
If you call {{getLog()}} in your constructor then you'll [get an instance of
{{SystemStreamLog}}|https://github.com/apache/maven/blob/40d5087b6b134842e2b61a567dbb4bfbcfab7ae6/maven-plugin-api/src/main/java/org/apache/maven/plugin/AbstractMojo.java#L177]
that unconditionally logs to {{System.out}}. Your mojo will be wired with an
SLF4J-backed logger *after* construction.
Call {{getLog()}} during the {{execute()}} method, and don't cache the value.
If any of this behaviour seems like it could be improved, consider being
specific about your use case and your expectations. Otherwise these sound like
cases where the documentation should be clearer, rather than the behaviour
changed.
> Maven-Plugin's getLog() ignores -Dorg.slf4j.simpleLogger.defaultLogLevel=warn
> -----------------------------------------------------------------------------
>
> Key: MNG-5835
> URL: https://issues.apache.org/jira/browse/MNG-5835
> Project: Maven
> Issue Type: Bug
> Components: Logging
> Affects Versions: 3.2.3, 3.3.3
> Reporter: S L
> Attachments: hello-maven-plugin.zip, hello-maven-plugin2.zip
>
>
> Hi,
> since Maven should supports slf4j-Logging combined with the SLF4J Simple
> implementation from Maven 3.1.0 onward
> (http://maven.apache.org/maven-logging.html).
> I'm kind of wondering why the default getLog() called from a Plugin ignores
> the Environment-Variable ``-Dorg.slf4j.simpleLogger.defaultLogLevel=warn``
> I'm currently using:
> Apache Maven 3.2.3 (33f8c3e1027c3ddde99d3cdebad2656a31e8fdf4;
> 2014-08-11T22:58:10+02:00)
> Maven home: /usr/share/maven-3.2.3
> Java version: 1.7.0_80, vendor: Oracle Corporation
> Java home: /usr/lib/jvm/java-7-oracle/jre
> Default locale: de_DE, platform encoding: UTF-8
> OS name: "linux", version: "3.16.0-33-generic", arch: "amd64", family: "unix"
> Tested with different Maven-Versions and different maven-plugin-api Versions,
> still no success.
> Any help is highly appreciated.
> Thanks,
> PS: Hopefully I can attach my Example-Project which can be executed by using:
> mvn clean install && mvn clean package -Pdemo
> -Dorg.slf4j.simpleLogger.defaultLogLevel=warn
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