When I terminate the google-app-engine's HelloWorld project from PyDev, the python.exe isn't terminated

When I terminate the google-app-engine's HelloWorld project from PyDev,
the python.exe isn't terminated

The issue is like this:
I created a Google-App-Engine's HelloWorld demo supplied by PyDev in
Eclipse, and then I just run the demo project, I browse the localhost:8080
and it succeeds.
But then I stop the project and start it again (or just restart it)
through the buttons, the browser couldn't show me a page from
localhost:8080, the browser keeps asking for the response and couldn't get
it.
I've googled it for about 5 hours. And finally, I found where the issue
lay on. First, when the helloworld project start, 2 python.exe process
will be added into the taskmgr. When you terminate the project from the
PyDev, there is no error sign there, but only 1 python.exe process was
terminated and the other one still remains even if you close the Eclipse.
So these python.exe still have the control of the port 8080, and the new
instance of python.exe created by the relaunch action couldn't use the
port 8080. So, the browser couldn't get a response back. If you keep doing
relaunch the project, the number of python.exe in the tasklist may become
10+. I've tried use the Windows cmd to start the project and 2 process
start when the start of the project and 2 process terminated when the
terminate of the process.
Changing the port 8080 which the project use to others couldn't solve the
issue. If you start and stop by using the Google's client of
Google-App-Engine. It just works well, there is no extra python.exe
process remain in the tasklist.
By the way, I've tried to update those software to the newest version for
now and reinstall them. But the issue still exists.
I've tried to use the pythonw.exe instead of python.exe as the
interpreter, the issue still exists.
Here is some environment data below:
OS: Win7x64 SP1
Eclipse: 4.3
PyDev: 2.8.2
Google-App-Engine: 1.8.4
Python: 2.7.5 x86
According to those details I mentioned above, I could believe that the
issue comes from the PyDev but I can't find the solution or the way to
submit the issue to the PyDev project team.