title: Libraries in Eclipse plugin Project
body: <p>I want to use the Apache commons.io for a plugin Project in Eclipse.
  I added the .jar to the buildpath:</p>
  
  <blockquote>
    <p>(properties->java build path->Libraries)</p>
  </blockquote>
  
  <p>But when I am trying to test my project, I get this error:</p>
  
  <blockquote>
    <p>NoClassDefFoundError for org/apache/commons/io/FileUtils.</p>
  </blockquote>
  
  <p>I think that Eclipse doesn't copy the library or that I miss to tell the project to copy that library.</p>
  
  <p>How can I solve this problem?
  I am trying to write an export plugin where a complete folder is copied to another folder.</p>