title: Eclipse does not remember external source attachments
body: <p>Using Eclipse 4.3.1 (Kepler) on Ubuntu, I find that each time I exit and reenter Eclipse, I have to respecify my external source attachments. What is the key to making Eclipse remember them?</p>
  <ol>
  <li><p>Open the Source Attachment Configuration dialog by clicking on the &quot;Change Attached Source&quot; button in the Class File Editor; or open the similar Java Source Attachment dialog by right-clicking on the containing jar in Package Explorer and selecting &quot;Properties&quot;.</p>
  <p>I've tried both.</p>
  </li>
  <li><p>In the dialog, click on the &quot;External File&quot; button and navigate to a jar containing sources, or click on the &quot;External Folder&quot; button and navigate to a directory containing .java files in subdirectories corresponding to the package hierarchy.</p>
  </li>
  </ol>
  <p>All these ways work until I quit Eclipse and come back in.</p>