auto-completion from jde

I'm trying to use jde completion, but, as a newbie, i can't use 
correctly. For example, to write a "System.out.prinln()", i've got the 
following problem:

I've:

1 - Sys<cursor here>, than i do C-c C-v C-., and the jde can't find any 
word to complete.

Jdee completion shouldn't list all the words that start with Sys? For 
example, system?

2 - If i've List result = new <cursor here>, Jdee completion shouldn't 
list all the class of type List? For example, ArrayList?

3 - Is there any faster way to use jde completion options while 
programming?

4 - Why jde completion menu and mini-buffer takes about 2 seconds to 
show up? Shouldn't it be immediatly? For the notice, I've byte-compile 
jde lisp files.

Thanks,
Pedro