I've solved it.
it was a problem in eclipse helios is that it cannot take drools plugin so i can open the process editor.
i've cleaned the eclipse and remove the drools plugin and feature jars from the eclipse 's plugin and features dirs , then i've install new software from the help tab and choose the drools update site .
Now it works , Thank You Very Much for the help .
I thinkl nopw i can build J2SE work flow application
Regards,