After about 45 minutes of frustration trying to work through some maven exercises in the Sonatype book I kept arriving at the following message:
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Reason: Not a v4.0.0 POM. for project org.apache.maven.plugins:maven-site-plugin at /Users/edgibbs/.m2/repository/org/apache/maven/plugins/maven-site-plugin/2.0-beta-6/maven-site-plugin-2.0-beta-6.pom
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I had the sample code downloaded and got the same error, so I investigated possibly not having access to the maven repositories. I’m on my in-laws network, possibly there’s something being blocked. I tried other mirrors without any success. Finally I just deleted the local maven repository and re-ran
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mvn clean install
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and everything just worked. I had forgotten how finicky the local repository can be.