title: web.xml is missing and <failOnMissingWebXml> is set to true - web.xml is there and can't edit deployment assembly
body: <p>I'm using Eclipse and I am getting the error "web.xml is missing and  is set to true" in my pom.xml even though the web.xml isn't missing.</p>
  
  <p><a href="https://i.stack.imgur.com/W5kWH.png" rel="nofollow noreferrer">web.xml missing</a></p>
  
  <p>In <a href="https://stackoverflow.com/questions/31835033/web-xml-is-missing-and-failonmissingwebxml-is-set-to-true">this thread</a> it's suggested that we update Deployment Assembly in properties, but I can't do that because I get the following error:</p>
  
  <p><a href="https://i.stack.imgur.com/bAHIK.png" rel="nofollow noreferrer">deployment assembly error</a></p>
  
  <p>I've also attempted to update the Maven build but I get an error when I try that.</p>
  
  <p>What can I do to fix these issues?</p>