title: Eclipse The deployment descriptor of the module 'xxx.war' cannot be loaded or found
body: <p>There's been a number of similar questions raised on this error on Eclipse:</p>
  
  <blockquote>
    <p>The deployment descriptor of the module 'xxx.war' cannot be loaded or
    found.</p>
  </blockquote>
  
  <p>This is a very generic error, and after scouring the web I have multiple different causes and solutions. I'm going to attempt to list them all here, so others won't have to go through the same thing I did. </p>
  
  <p>If anyone experienced other causes and solutions, please list them here too. =)</p>
  
  <p>(Moderators, please wait for me to put the answer up before judging this question)</p>