title: Unable to add Guava to NetBeans libraries
body: <p>I'm trying to add <a href="http://search.maven.org/remotecontent?filepath=com/google/guava/guava/18.0/guava-18.0.jar" rel="nofollow">the Guava 18 release</a> to a NetBeans project. I'm downloading it from their <a href="https://github.com/google/guava/wiki/Release18" rel="nofollow">GitHub</a> page. </p>
  
  <p>But whenever I navigate in NetBeans, "Project" (right-click)  -> "Properties" -> "Libraries" -> "Add JAR/Folder", I'm unable to add the Guava  JAR that I downloaded.</p>
  
  <p>This is strange, since I have no problem adding the Apache Commons Math JAR that I downloaded (and stored in the same folder).</p>
  
  <p>Can anyone reproduce this problem, by creating a new NetBeans Project (in NetBeans 8.0.2), and trying to add the Guava JAR under Libraries?</p>