title: App engine local host not working on Eclipse after Java updates on 20/01/2021
body: <p>After a popup window has shown asks to confirm Java updates, the App engine could not be started again and Eclipse showing the following error:</p>
  <blockquote>
  <p>INFO: Overwriting system property key 'file.encoding', value 'Cp1252' with value 'UTF-8' from 'C:\Users\XXXX\eclipse-workspace.metadata.plugins\org.eclipse.wst.server.core\tmp0\XXXX\WEB-INF\appengine-web.xml'
  java.lang.NullPointerException
  at java.base/java.util.concurrent.ConcurrentHashMap.putVal(ConcurrentHashMap.java:1011)
  at java.base/java.util.concurrent.ConcurrentHashMap.put(ConcurrentHashMap.java:1006)
  at java.base/java.util.Properties.put(Properties.java:1334)
  at java.base/java.util.Collections$CheckedMap.put(Collections.java:3701)
  at com.google.appengine.tools.development.SharedMain.setTimeZone(SharedMain.java:183)
  at com.google.appengine.tools.development.SharedMain.postServerActions(SharedMain.java:152)
  at com.google.appengine.tools.development.DevAppServerMain$StartAction.apply(DevAppServerMain.java:398)
  at com.google.appengine.tools.util.Parser$ParseResult.applyArgs(Parser.java:45)
  at com.google.appengine.tools.development.DevAppServerMain.run(DevAppServerMain.java:257)
  at com.google.appengine.tools.development.DevAppServerMain.main(DevAppServerMain.java:248)</p>
  </blockquote>