title: IntelliJ suggests wrong @NotNull annotation
body: <p>IntelliJ is suggesting to import <code>com.sun.istack.internal.NotNull</code> the @NotNull annotation (which is wrong) in the following program:</p>
  
  <pre><code>public class Test implements Comparable&lt;Test&gt; {
      @Override
      public int compareTo(@NotNull Test o) {
          return 0;
      }
  }
  </code></pre>
  
  <p>When trying the correct import <code>com.intellij.annotations.NotNull</code> (I think) it looks like it can't find the class:</p>
  
  <p><img src="https://i.stack.imgur.com/ITIr6.png" alt="enter image description here"></p>