title: Apache Commons Net FTP does not throw any exception on wrong credentials
body: <p>I just managed to upload some files to an FTP server using Apache Commons Net FTP. When I use everything as it should be it works fine, I mean, the file uploading is working, but when I use, for example, a wrong password for the FTP account, obviously the files don't get uploaded to the server, but I don't get an error message either. In other words: I don't know how to show the error. I tried to show with a toast the <code>e.getMessage()</code> from the <code>Exception</code> but nothing is shown. Is there any documentation that would help me? Or am I missing something you could help me with? thank you!</p>
  <p>This is my code:</p>
  <pre><code>@Override
  protected Void doInBackground(Void... voids) {
      FTPClient ftpClient=new FTPClient();
      try {
          ftpClient.connect(fserver);
          ftpClient.login(fusername,fpassword);
          ftpClient.enterLocalPassiveMode();
  
          dirArch = new ArrayList&lt;&gt;();
          for (int k=0;k&lt;adapter.getSelected().size();k++){
              dirArch.add(adapter.getSelected().get(k).getArch());
          }
          for (String archTXT : dirArch){
              File fileX =new File(stringFolder,archTXT);
              InputStream inputStream=new FileInputStream(fileX);
              ftpClient.storeFile(archTXT,inputStream);
              inputStream.close();
              pbPorc=pbPorc+pbSum;
              pb1.setProgress(pbPorc);
              pb2.setProgress(pbPorc);
          }
          ftpClient.logout();
          ftpClient.disconnect();
      } catch (IOException e) {
          e.printStackTrace();
          Toast.makeText(ExportTracks.this,e.getMessage(),Toast.LENGTH_LONG).show();
      }
      return null;
  }
  </code></pre>