title: Eclipse ClassNotFoundException
body: <p>Everything works fined, but suddenly eclipse stopped execute and junit tests or even main method, when i run them using run as - > Java application, run as ->  junit test</p>
  
  <p>It simply throws error</p>
  
  <pre><code>Caused by: java.lang.ClassNotFoundException: package.ClassName
  </code></pre>
  
  <p>whene ClassName - is class from where i trying to run method main. 
  It affect only one of my projects ... Different workspaces works fine, other project in same workspace works fine as well.</p>
  
  <p>I'm sure if i recreate current project, error will gone. But the adjustments of this project in eclipse is really hard, so i want to avoid it.</p>
  
  <p>Any clue?</p>