title: org.eclipse.emf.ecore.xmi.FeatureNotFoundException in Eclipse Juno on Ubuntu while loading descriptor
body: <p>I have a GWT+GAE project which is using spring security as well. The project was running fine before I migrate it to Maven. Now after its been converted to maven project eclipse is giving following error every time I try to build the proj.</p>
  
  <blockquote>
    <p>An internal error occurred during: "Loading descriptor for MyProj.".
    org.eclipse.emf.ecore.xmi.FeatureNotFoundException: Feature
    'system-properties' not found.
    (platform:/resource/MyProj/src/main/webapp/WEB-INF/web.xml, 65, 22)</p>
  </blockquote>
  
  <p>Eclipse version : Juno Service Release 1
  OS : Ubuntu 12.04
  Plugin : m2e maven plugin.</p>
  
  <p>I tried disabling validations but still error is persisting. I also tried adding the system-properties tag in web.xml as suggested in error, but that too didn't help.</p>
  
  <p>Interesting thing is that, I am able to run the project but this error on every build is very annoying.</p>
  
  <p>Any help would really be appreciated. Thanks.</p>
  
  <p><img src="https://i.stack.imgur.com/z97qi.png" alt="FeatureNotFoundException in Juno"></p>