title: Why do I need to copy libraries in lib folder if I define an user library in Eclipse?
body: <p>I created a "dynamic web project" in eclipse and I added to the build path the requested libraries using a "user library". Why it is not sufficient to run the application and I need to copy the libraries in the lib folder of the project?</p>
  
  <p>I understand that it should be a very simple concept, it should be connected on how eclipse and the server store libraries, but I can't find a simple answer.</p>