Why my setting of the sourcepath does not work?

Hi All

I just download the jswat 2.6, here below is my work step by step ( I 
worked on Solaris, using JDK1.4)

1. download and unzip jswat to /export/home/paul/java/jswat/jswatbin
2. download tutorial.java to /export/home/paul/java/jswat
3. launch javac -g tutorial.java in /export/home/paul/java/jswat, the 
tutorial.class and tutorial$1.class are generated.
4. launch jswat by command: java com.bluemarsh.jswat.Main
5. setting classpath to /export/home/paul/java/jswat
6. setting sourcepath to /export/home/paul/java/jswat
7. press menu Session-->start VM, fill in the class name with 
tutorial.class, check Start VM suspended
8. Press OK

the system report that VM loaded, but " Source for class not find. Check 
sourcepath. (Class tutorial.class).

I also tried to launch jswat with java 
-Djava.source.path=/export/home/paul/java/jswat com.bluemarsh.jswat.Main 
but alsi in vain.

Anybody know how to solve the problem?

Thanks in advance!

-Paul