title: Adding buildpath of existing project to a new project
body: <p>I have two projects in Eclipse's workspace Project A &amp; Project B.</p>
  
  <p>I want to add Project B to A's buildpath but no matter what I do it doesn't work. I've looked it look and none of the answers work for me. Although exporting B as a jar and adding the jar to the buildpath works I will need to update B's code and I do not want to have to constantly export it as jar everytime.</p>
  
  <p>I've tried adding B as a class folder but it fails to work. In the jar <code>import bproj.BMain;</code> works but as a class folder it does not.</p>
  
  <p>How can I add B to A's buildpath?</p>