A DESCRIPTION OF THE PROBLEM :
I believe this does not distinguish between the fully qualified file name and the "base".

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
   http://java.sun.com/products/jdk/1.2/

ACTUAL -
Gets the URL of the document in which this applet is embedded. For example, suppose an applet is contained within the document:
    http://java.sun.com/products/jdk/1.2/index.html
 The document base is:
    http://java.sun.com/products/jdk/1.2/index.html
 
should be changed so that the last part of the last line is merely
   http://java.sun.com/products/jdk/1.2/
 

URL OF FAULTY DOCUMENTATION :
http://java.sun.com/j2se/1.5.0/docs/api/java/applet/Applet.html#getDocumentBase()
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