title: error in validation of project in eclipse - clean
body: <p>Since I updated my osx version this morning (no other changes) I get cleaning my project in eclipse:</p>
  
  <pre><code>Errors occurred during the build.
  Errors running builder 'Validation' on project 'XXXXX'.
  java.lang.NullPointerException
  </code></pre>
  
  <p>and the same result trying to run maven=> update project.</p>
  
  <p>my configuration:</p>
  
  <pre><code>Apache Maven 3.2.1 (ea8b2b07643dbb1b84b6d16e1f08391b666bc1e9; 2014-02-14T18:37:52+01:00)
  Maven home: /usr/local/Cellar/maven/3.2.1
  Java version: 1.6.0_65, vendor: Apple Inc.
  Java home: /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
  Default locale: nl_NL, platform encoding: MacRoman
  OS name: "mac os x", version: "10.9.3", arch: "x86_64", family: "mac"
  </code></pre>
  
  <p>All suggestions are welcome!</p>