a problem about debugging java program

[Lei Guo]

when I use ddd to debug java program, I type the following command:
        ddd --jdb &
then click the menu "File|Open class", the window that ddd pops showing 
nothing (see attachment). If I type
        ddd --jdb Test &
ddd pop a window showing:
        Cannot access class "Test"
and the source window is blank. But in the JDB console ( the bottom 
window in ddd GUI) showing:

GNU DDD 3.3.1 (i386-redhat-linux-gnu), by Dorothea Lütkehaus and Andreas 
Zeller.
Copyright © 1995-1999 Technische Universität Braunschweig, Germany.
Copyright © 1999-2001 Universität Passau, Germany.
Initializing jdb ...
> load Test
>

I can click menu "File|Open Source" to open the code and set break 
point, and I can use the command tool buttons such as run, step, next, 
etc. But when I debugging the program, there is no excution position 
arrow in source code window, and the "display" button (to show data in 
the data window) does not work, I have to use the "print" button. 
"watch" button does not work either. It is no problem to type jdb 
command in the jdb console. Another words, it seems only jdb is working, 
not ddd. Who can tell me what should I do?

Thank you very much!

My OS, ddd, and java version:

OS: red hat 7.3 linux, kernel 2.4.18
ddd version: 3.3.1
java version: j2sdk 1.4.0

--
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Lei Guo
College of William and Mary     Office: M-S Hall 101C
Department of Computer Science  Phone:  (757)221-3468(O)
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