dot notation question

[Li Lin <guru dot lin at gmail dot com>]

Hi all,

I'm a newbie to Kawa, so excuse me if I'm asking the obvious. here is  
my code:

(define (get-initial-context class-name url username password)
  (let ((props (java.util.Properties:new)))
     (begin
      (*:put props  
(javax.naming.InitialContext:.INITIAL_CONTEXT_FACTORY) (->jstring  
class-name))
    ;; snip...
 	(javax.naming.InitialContext:new props)))

returns error message:
<unknown>: no slot `INITIAL_CONTEXT_FACTORY' in  
javax.naming.InitialContext  (i'm using kawa-1.8.jar)

but if I modify the code below it worked.

(define *initial-context*  
(javax.naming.InitialContext:.INITIAL_CONTEXT_FACTORY))

(define (get-initial-context class-name url username password)
  (let ((props (java.util.Properties:new)))
     (begin
      (*:put props *initial-context* (->jstring class-name))
	;snip
     (javax.naming.InitialContext:new props)))

so, what's the real difference between the two? and why dot notation  
didn't work in the 1st scenario?

Thanks.

--Li Lin