title: centos7 jps return nothing
body: <p>I am using a centos7 on VMware, somehow today, when I run jps, it return nothing, it used to have at least a jps process.</p>
  <pre><code>[xxxxxx]$ jps
  [xxxxxx]$ 
  </code></pre>
  <p>Any suggestions about why this is happening, and how to solve it?</p>