title: how to create jar file using eclipse
body: <p>I have a folder name called configurator which has many sub folders and class files. I need to create a <code>configurator.jar</code> file of this folder using eclipse. 
  I followed below steps to create jar file. </p>
  
  <ol>
  <li>create a java project</li>
  <li>right click on project name, go to properties, go to java build path, click on source --> link source, browse and select configurator folder, add required external libraries --> click ok.</li>
  <li>Now, I am able to see the folder structure in navigator. Right click on configurator folder and select export</li>
  <li>select jar file and save the jar file in specified folder.</li>
  </ol>
  
  <p>But, after saving the jar file, i am not able to see the class files inside the jar.</p>
  
  <p><strong>My question is</strong>: Why the class files not exported into the jar? How to do it using eclipse?</p>