title: Find from which library the class comes from in eclipse
body: <p>Lets say I have a import line in my class:</p>
  
  <pre><code>import org.apache.log4j.Logger;
  </code></pre>
  
  <p>How can I know from which library does it come from? Lets say I have maven folder, that contains tons of libraries. </p>
  
  <p><strong>Why?</strong>
  I want to use this class/library in my other project, but I don't know which JAR to copy.</p>