title: Installing PDT on Eclipset Classic 3.7 (indigo) always fail
body: <p>Every time i try to install PDT through "install new software" feature in Eclipse Classic 3.7 (tutorial <a href="http://wiki.eclipse.org/PDT/Installation" rel="nofollow">here</a>) i get the following error, after a lot of time fetching and downloading stuff:</p>
  
  <blockquote>
    <p>An internal error occurred during: "Install download1". Comparison
    method violates its general contract!</p>
  </blockquote>
  
  <p>This is frustrating cause i'm following the tutorial <em>exactly</em>. What's wrong with it? How can i check for logs and try to find out the actual error?</p>
  
  <p>This happens on both x86 and x64 version of Eclipse. Tried in a fresh environment, Windows 7 x64, JRE 7 x64 and Eclipse Classic 3.7.</p>