title: Intellij IDEA: False positives on build
body: <p>I'm using Intellij IDEA for work on a Java project.</p>
  
  <p>I'm finding I get a lot of false positives when I build in Intellij, but only when there are other compilation errors - e.g. I've made a change and expect a number of compile errors, so I build to find all the errors. (In this instance, I changed a widely used interface, and want the compiler to catch the errors so that I know which implementations to fix.) In addition to some of these expected errors, Intellij reports hundreds of false positives (which makes it difficult to find the real errors - at present the compiler is showing only one genuine compile error each time, so I have to rebuild to find the next error...). These false compile errors are not highlighted - indeed, they are not real compile errors. (Nor do they appear if I compile via Maven.)</p>
  
  <p>The most common error is 'cannot find symbol class [X]', despite that class often being in the same project.</p>
  
  <p>I've tried:
  - upgrading Intellij (from 10.5.1 to 10.5.2 to 11.0.1)
  - invalidating and rebuilding caches
  - restarting Intellij
  ...but all to no effect.</p>
  
  <p>I've searched the <a href="http://youtrack.jetbrains.net/dashboard" rel="noreferrer">Intellij Bug Tracking board</a>, but haven't found any reference to this there, so wondered whether this is user error (if so, what settings do I need to change)?</p>
  
  <p>Has anyone else experienced anything like this? If so, how did you fix it?</p>