I found that 
  mvn eclipse:eclipse
do not really work well when you've got multiple modules in your maven structure like 
PlayN, spitting out the following error 
   Failed to execute goal org.apache.maven.plugins:maven-eclipse-plugin:2.8:eclipse (default-cli) on project playn-archetype 
Request to merge when 'filtering' is not identical. 
After some digging and trying out, it seems that specifying a specific version of maven-eclipse-plugin seems to make it happy, guessing maven gets confused when trying to resolve which maven-eclipse-plugin to use in the process. Anyway here's the one that works for me 
   org.apache.maven.plugins
   maven-eclipse-plugin
   2.6
 
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