Maven: how to mitigate mvn "fileNameMapping has been removed ... use outputFileMapping instead"

using mvn install I get the error message "fileNameMapping has been removed with version 3.0.0 but you are still using it...".

First of all, I am not using "fileNameMapping" anywhere, but I might use some pom which in turn might use it.

First question: How do I find the pom which does this? And second question: When does that kick in anyway? Documentation (https://maven.apache.org/plugins-archives/maven-ear-plugin-2.6/examples/customize-file-name-mapping.html) says that my project has the same artifactId for different groups. How can this be? The artifact id is unique, or what does the word "group" mean in this case?

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