title: java.lang.ClassNotFoundException after changing nothing in the project but upgrading eclipse android sdk
body: <p>Some time ago I developed a rather simple app, with a target of 4.2.2. I had it working normally in my device. Then I stopped development for about 1 month.</p>
  
  <p>After the recent Google I/O, I decided to come back to development. What I first did was open the Android SDK Manager and update to the newly available packages (I think it was only the SDK tools, platform tools, and not much more).</p>
  
  <p>I then tried to run the project and got this <code>java.lang.ClassNotFoundException</code>. I checked everything, no errors at all, building completing successfully.</p>
  
  <pre><code>java.lang.ClassNotFoundException: Didn't find class "com.example.compassgps.CompassGPSActivity" on path: /data/app/com.example.compassgps-2.apk
  </code></pre>
  
  <p>I have tried a lot of things: cleaned the project, changed Android target (in case the new revisions to API17 had made anything crash)...</p>
  
  <p>I have searched through StackOverflow's already asked questions, but have not found any of the situations in which the changes to the project were NONE. So I am feeling quite frustrated now because I have actually changed NOTHING and my project has stopped working :(</p>