rmannibucau opened a new pull request, #1041:
URL: https://github.com/apache/maven/pull/1041

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   The issue with current code is that using a SLF4J binding which is not known 
by maven will lead to WARNINGs.
   There are several builds which intend to run without warning or consider 
warnings as error and therefore fail - not using maven CLI options but other 
mecanism - either log analyzis on CI, the old way with appenders/handlers or 
stdout/stderr check if the handlers support the redirection properly.
   This behavior defeats a bit using a logger abstraction since the support is 
pretty limited.
   The idea is to keep the message - we can refine it later if relevant - but 
log it at info level to not make the build failling when there is no issue 
loading the impl maven should use and keep warning when a loading failed (we 
can evaluate the move to error later too for this case).


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