title: How display progress message/bar when a backend process is running?
body: <p>I use Runtime.getRuntime().exec to run a perl program. Now I want to display a percent progress bar during the execution and then after the execution of perl program is finished, it should close the progress bar. How can I do it?</p>
  
  <pre><code>Runtime.getRuntime().exec (perl.exe, test.pl);
  
  progress bar code?
  </code></pre>
  
  <p>Please help.</p>