title: Step through JDK source code in IntelliJ IDEA
body: <p>How can I step through JDK source code in IntelliJ IDEA 7 and see the debug info?  I can currently hit breakpoints and step through the code, but the debug info is not available.  This means I can't see the value of local variables.</p>
  
  <p>I only want to step through the source code of one class, if that matters.<br>
  For what it's worth, it's the <code>javax.swing.text.html.HTMLDocument</code> class and I do have a copy of the corresponding <code>.java</code> file.</p>