title: Intellij: No usages found in Project Files
body: <p>I'm using IntelliJ 15 and I'm trying to find usages of methods and objects in a .java file packed in a .jar file downloaded through Maven. I now that they're used: I can find them through the simple <code>search</code> (ctrl+f) command, but when I try with the <code>Find Usages</code> command the post-title message is returned.</p>
  
  <p>I've read <a href="https://stackoverflow.com/questions/27634694/intellij-ultimate-14-find-usages-not-working">this</a> post, but it doesn't work. </p>
  
  <p>This an example of a method in a file <code>InstanceManager.class</code> (belonging to .jar file imported with Maven):</p>
  
  <pre><code>private void notifyNewInstance(Instance instance) {
      List var2 = this.instanceListeners;
      synchronized(this.instanceListeners) {
          Iterator var3 = this.instanceListeners.iterator();
  
          while(var3.hasNext()) {
              InstanceListener listener = (InstanceListener)var3.next();
  
              try {
                  listener.newInstanceAvailable(instance);
              } catch (Throwable var7) {
                  LOG.error("Notification of new instance availability failed.", var7);
              }
          }
  
      }
  }
  </code></pre>
  
  <p>And in the same file is called with <code>this.notifyNewInstance(host);</code> but if I use <code>Find usages</code> on <code>notifyNewInstance</code> I'll receive the error.</p>
  
  <p><strong>UPDATE:</strong>
  I've tried to <code>Download</code> the source code, but I get the message:</p>
  
  <blockquote>
    <p>Cannot download sources Sources not found for:
    org.apache.flink:flink-runtime_2.10:1.1-20160316.114232-35</p>
  </blockquote>
  
  <p>Can you help me with that?</p>