title: Configuring Eclipse with JavaDocs for standard Java libraries
body: <p>I've installed JDK 8 and Eclipse Kepler on a new PC then imported some old projects copied from an old PC (that had been using JDK 6 but that is probably not relevant).</p>
  
  <p>I get errors which seem inappropriate. For example in a class that implements <code>Observer</code>, Eclipse says my <code>update</code> method <em>"must override a Superclass method."</em></p>
  
  <p>When I hover the mouse over Observer in <code>public class Foo implements Observer {</code></p>
  
  <p>Instead of Javadoc I get </p>
  
  <pre><code>java.util.Observer
  Note: This element neither has attached source nor attached Javadoc 
        and hence no Javadoc could be found.
  </code></pre>
  
  <p>Obviously I need to attach some Javadoc for all the Java standard library stuff.</p>
  
  <p>Some Googling and reading of tutorials hasn't led me to an obvious solution.</p>
  
  <p>How do I fix this in Eclipse for all projects/workspaces?</p>