title: webpack gives messages "Watchdog connection closed. Trying to re-run watchdog." in Vaadin 14 app
body: <p>Running a new Vaadin 14.0.8 app in IntelliJ Ultimate 2019.3 EAP pre-release, on Java 13. I created the project using the "Plain Java Servlet" flavor on the <a href="https://vaadin.com/start/latest" rel="nofollow noreferrer">new project page</a>. The only change I made to the POM was adding the npm/Node plugin as described in <a href="https://stackoverflow.com/a/57502853/642706">this Answer</a>.</p>
  
  <p>When I run my web-app using the <code>jetty:run</code> item in the Maven panel, I get these messages on the console:</p>
  
  <pre class="lang-none prettyprint-override"><code>[webpack] INFO dev-webpack - Watchdog connection closed. Trying to re-run watchdog.
  [webpack] INFO dev-webpack - Watchdog connected.
  </code></pre>
  
  <p>These repeat every minute or so, even before connecting with a browser. When I do connect with a browser, I get another four of these repeated. </p>
  
  <p>➥ What do these messages mean? Is there a problem? </p>
  
  <p>➥ Why so many? </p>