jython 2.7b2 and flask reload - subprocess issue

gistfile1.txt

# hello.py
from flask import Flask
app = Flask(__name__)
 
@app.route('/')
def hello_world():
    return "Hellox, World!"
 
    if __name__ == '__main__':
        app.debug = True # <------ removing this everything works fine
        app.run()



(venv)paolo@tk:$ java -jar jython-standalone-2.7-b2.jar app/hello.py 
 * Running on http://127.0.0.1:5000/
 * Restarting with reloader
Traceback (most recent call last):
  File "app/hello.py", line 10, in <module>
    app.run()
  File "/home/paolo/jdevel/golap-workspace/venv/project/Lib/flask/app.py", line 772, in run
    run_simple(host, port, self, **options)
  File "/home/paolo/jdevel/golap-workspace/venv/project/Lib/werkzeug/serving.py", line 708, in run_simple
    run_with_reloader(inner, extra_files, reloader_interval)
  File "/home/paolo/jdevel/golap-workspace/venv/project/Lib/werkzeug/serving.py", line 617, in run_with_reloader
    sys.exit(restart_with_reloader())
  File "/home/paolo/jdevel/golap-workspace/venv/project/Lib/werkzeug/serving.py", line 617, in run_with_reloader
    sys.exit(restart_with_reloader())
  File "/home/paolo/jdevel/golap-workspace/venv/project/Lib/werkzeug/serving.py", line 601, in restart_with_reloader
    exit_code = subprocess.call(args, env=new_environ)
  File "/home/paolo/jdevel/golap-workspace/venv/project/jython-standalone-2.7-b2.jar/Lib/subprocess.py", line 500, in call
  File "/home/paolo/jdevel/golap-workspace/venv/project/jython-standalone-2.7-b2.jar/Lib/subprocess.py", line 830, in __init__
  File "/home/paolo/jdevel/golap-workspace/venv/project/jython-standalone-2.7-b2.jar/Lib/subprocess.py", line 1309, in _execute_child
TypeError: args must contain only strings

Note you also need to add -Dpython.cachedir.skip=false to your Java command line, or Jython won't be able to find java.lang.management:

java -Dpython.cachedir.skip=false -jar /path/to/jython/jarfile.jar flask_file_to_run.py