How to reproduce:
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from http://java.sun.com/javase/6/download.jsp click on "Installation Instructions" or "ReleaseNotes" for JDK/JRE
It will redirect to:
http://java.sun.com/javase/webnotes/6/index.html or http://java.sun.com/javase/webnotes/6/install/index.html
These url's has a "JDK Documentation" link and it refers to a wrong url: http://www.java.com/sun.com/javase/6/docs/index.html

Also, the link below "JDK documentation" which says "Japanese" is a broken link too.