title: Package does not exist
body: <p>I get an "Build failed" error with error output when I try to build my project in Eclipse:</p>
  
  <p>[javac] ......\src\example\servlet\ScrapingServlet.java:10: package org.apache.http.client does not exist
      [javac] import org.apache.http.client.HttpClient;</p>
  
  <p>But the Eclipse editor does not give any error. I added the jars to the project with Project > properties > add external JARS... and all the JARS are showed in the project explorer. What am I doing wrong?</p>