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I went through the resulting pom by hand to compare the most current versions of all the datanucleus and maven-gae-plugin with what was available from their repos. That got me past the issue in this...

Duh, if I can't post here, I can post elsewhere so here are the gory details.

mvn -X:

http://pastie.org/4127817
http://pastie.org/4127820

Complete pomfile:

http://pastie.org/4127833

No apparent conflicts there... -X shows
[DEBUG] com.google.appengine.orm:datanucleus-appengine:jar:2.0.0-final:compile
[DEBUG] org.datanucleus:datanucleus-enhancer:jar:3.1.0-m1:compile...

Thanks for your quick reply and, agreed, let's look at what's in the pom that's causing this.

I'm new to this forum so my apologies for not including a full 'mvn -X' and the pomfile as well. ...

Using clean maven repositories and both mvn 3.0.4 as well as 2.2.1 I get this error.

To reproduce:

project --topLevelPackage com.peoplemerge.roodemo
jpa setup --provider DATANUCLEUS --database...