title: To build this project Maven (or greater) is required
body: <p>I installed latest version of Netbeans (8.0.2) with Maven (4.27.1) installed as a plugin (so by default).</p>
  
  <p>When I try to build latest version of optaplanner (6.3.0) I get exception </p>
  
  <pre><code>Building OptaPlanner examples 6.3.0.Final
  ------------------------------------------------------------------------
  
  --- maven-enforcer-plugin:1.3.1:enforce (enforce-plugin-versions) @ optaplanner-examples ---
  
  --- maven-enforcer-plugin:1.3.1:enforce (enforce-java-version) @ optaplanner-examples ---
  
  --- maven-enforcer-plugin:1.3.1:enforce (enforce-maven-version) @ optaplanner-examples ---
  Rule 0: org.apache.maven.plugins.enforcer.RequireMavenVersion failed with message:
  To build this project Maven 3.2.3 (or greater) is required. Please install it.
  ------------------------------------------------------------------------
  BUILD FAILURE
  --------------------------------------------------------------
  
  Failed to execute goal org.apache.maven.plugins:maven-enforcer-plugin:1.3.1:enforce (enforce-maven-version) on project optaplanner-examples: Some Enforcer rules have failed. Look above for specific messages explaining why the rule failed. -&gt; [Help 1]
  
  To see the full stack trace of the errors, re-run Maven with the -e switch.
  Re-run Maven using the -X switch to enable full debug logging.
  </code></pre>
  
  <p>What can I do in order to build this project ?</p>