title: All java classes and objects gone (eclipse, android SDK)
body: <p>I've got this really weird problem, have been working on a project all night and suddenly when I open Eclipse, I get hundreds of errors.</p>
  
  <p>Nothing from <code>String</code> to <code>Java.IO</code> can be found... text like <code>import java.io can not be resolved</code> is everywhere. I have no clue what I have done, anyone can give me a hint? I would really appreciate it!</p>
  
  <p>/Nick</p>