title: Eclipse plugin: Place custom icon in Java Editor
body: <p>I'm new to eclipse but I want to prototype something. The APIs are a bit of a maze. I would like to programmatically place (and then move/remove) an icon on a given line in the editor, preferably in the margins. </p>
  
  <p>Here's an example:</p>
  
  <p><img src="https://i.stack.imgur.com/qBWv3.png" alt="Example location for a custom icon in Java Editor"></p>
  
  <p>Does anyone have an idea, or a good strategy for implementing something that?</p>