title: NoClassDefFound Exception, when using imported jar from libs
body: <p>I am trying referencing a <strong>libs</strong> folder in my project.</p>
  
  <p><strong>1.)</strong> I created a simple jar with one single dummy class <code>ImportableDummy.java</code> and exported the project as a jar.</p>
  
  <p><strong>Jar Project:</strong></p>
  
  <p><img src="https://i.stack.imgur.com/cwUzb.png" alt="enter image description here"></p>
  
  <p><strong>2.)</strong> Then I put the jar into the <strong>libs folder</strong> inside my Project.
  The lib is then listed under "Private Libraries":</p>
  
  <p><strong>Jar referencing Project:</strong></p>
  
  <p><img src="https://i.stack.imgur.com/crSNW.png" alt="enter image description here">
  <img src="https://i.stack.imgur.com/opiwi.png" alt="enter image description here"></p>
  
  <p><strong>3.)</strong> 
  At least I doublechecked, that the "PrivateLibraries" are marked as "exported"</p>
  
  <p><img src="https://i.stack.imgur.com/0vsae.png" alt="enter image description here"></p>
  
  <p><strong>QUESTION:</strong></p>
  
  <p>Still there is a <code>java.lang.NoClassDefFoundError: com.test.my.ImportableDummy</code> exception, when I run the App. During compileTime the class is perfectly found by the compiler.</p>
  
  <p>What am I missing?</p>
  
  <ul>
  <li>P.S. A tried to create a separate lib project for the jar too, with the same result.</li>
  <li>P.P.S. I started Eclipse with the <code>-clean</code> argument with no result</li>
  </ul>