Slf4j Misuse

[ghost]

Why does your jar have a StaticLoggerBinder in it?

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/hugballs/.m2/repository/pl/project13/maven/git-commit-id-plugin/2.2.0/git-commit-id-plugin-2.2.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/hugeballs/.m2/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.4.1/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]

http://www.slf4j.org/codes.html#multiple_bindings

Note The warning emitted by SLF4J is just that, a warning. Even when multiple bindings are present, SLF4J will pick one logging framework/implementation and bind with it. The way SLF4J picks a binding is determined by the JVM and for all practical purposes should be considered random. As of version 1.6.6, SLF4J will name the framework/implementation class it is actually bound to.

Embedded components such as libraries or frameworks should not declare a dependency on any SLF4J binding but only depend on slf4j-api. When a library declares a compile-time dependency on a SLF4J binding, it imposes that binding on the end-user, thus negating SLF4J's purpose. When you come across an embedded component declaring a compile-time dependency on any SLF4J binding, please take the time to contact the authors of said component/library and kindly ask them to mend their ways.

[TheSnoozer]

The reason why we have the SLF4J-StaticLoggerBinder in the jar is because Maven screwed up the class loading. See #198 and https://issues.apache.org/jira/browse/MNG-5787

What version of Maven you are using?
Could you provide an example how we could reproduce the Problem?

[g1franc]

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/tools/maven/repository/pl/project13/maven/git-commit-id-plugin/2.2.0/git-commit-id-plugin-2.2.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/tools/maven/repository/org/slf4j/slf4j-simple/1.7.12/slf4j-simple-1.7.12.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.SimpleLoggerFactory]

[g1franc]

Maven version is 2.2.1

[autayeu]

#233 might solve this by removing SLF4J altogether.

[ktoso]

This is solved by the linked PRs, thanks!