title: Generating Eclipse project files with Maven
body: <p>When I try and generate the Eclipse project files using <code>mvn eclipse:eclipse</code> I get the following error:</p>
  
  <blockquote>
    <p>Internal error in the plugin manager executing goal
    'org.apache.maven.plugins:maven-eclipse-plugin:2.9-SNAPSHOT:eclipse': Unable to load the mojo
    'org.apache.maven.plugins:maven-eclipse-plugin:2.9-SNAPSHOT:eclipse'
    in the plugin 'org
    .apache.maven.plugins:maven-eclipse-plugin'.
    A required class is missing:
    org/codehaus/plexus/resource/loader/ResourceNotFoundException</p>
  </blockquote>
  
  <p>It appears that I'm using version 2.9-SNAPSHOT of the Maven Eclipse plugin. My guess is that there is a bug in this version of the plugin and if I use a stable release (instead of a snapshot), the problem will be resolved. Is there a way that I can change the version of this plugin I'm using, or is this problem unrelated to the version of the Eclipse plugin?</p>