title: Google app engine JRE Class "Black List"
body: <p>There is a "<a href="http://code.google.com/appengine/docs/java/jrewhitelist.html" rel="noreferrer">JRE Class White List</a>" for the Google App Engine.</p>
  
  <p>What I would really like is a "Black List" -- in other words, Java APIs that will not work on GAE. Does such a list exist? Have any developers run into problems with Java APIs on GAE? </p>