title: What is meaning of the number after exec in "[http-bio-8080-exec-494] [ERROR]"?
body: <p>While going through an investigation in a legacy Java Spring Maven project deployed on tomcat 7 the logs stated like below-</p>
  
  <blockquote>
    <p>2018-08-29 18:16:42:471 +0600 [http-bio-8080-exec-494] [ERROR]</p>
  </blockquote>
  
  <p>Asking to demystify the number after </p>
  
  <blockquote>
    <p>exec-</p>
  </blockquote>
  
  <p>So basically the meaning of "exec"?
  which is <strong>494</strong> for the above case. </p>