There are few link related issues:

URL: http://download.java.net/jdk8/docs/api/overview-summary.html
Broken Link: http://cgi.omg.org/

There are many occurrences of the above url

error Lines: 1403, 1487 http://cgi.omg.org/cgi-bin/doc?ptc/2000-08-06
http://cgi.omg.org/cgi-bin/doc?formal/99-10-07

 List of redirects

The links below are not broken, but the document does not use the exact URL, and the links were redirected. It may be a good idea to link to the final location, for the sake of speed.

warning Line: 1551 http://java.sun.com/xml redirected to http://www.oracle.com/technetwork/java/index.html
    Status: 301 -> 200 OK

    This is a permanent redirect. The link should be updated.