title: How to reference a non-maven project (in eclipse workspace) from a maven project?
body: <p>I am working on a new project which is a plugin for a product.</p>
  
  <p>I use maven to build my plugin (zip) but I need to reference the source code of the product which is defined in my Eclipse workspace. But this source code is not managed by Maven and I do not want to migrate it. </p>
  
  <p>Is it possible to refers this workspace project by any way? (maven plugins, workaround welcome).</p>
  
  <p>The dependency is just needed for the compilation inside Eclipse but will not be packaged in the plugin itself (<code>provided</code> scope).</p>
  
  <p>I have also m2e in Eclipse and I want to keep this configuration when I make a "Maven Update". </p>
  
  <p>UPDATE: I am looking for a solution which will work with a <code>mvn clean install</code> on a command line because I want to be able to execute the build from a CI platform  (e.g. Jenkins)</p>