[Jython-users] How to install pillow

[Régis R. <reg...@gm...>]

Dear jython users,

I'm new to python, and I would like to call a python script from java.
After a little bit of research, I decided to use jython.

I want the java program to let an admin generate custom excel files using
python.

That's why I need to install openpyxl, multiprocessing and finally pillow
to load images into the xlsx.

But installing pillow gives me some troubles.
First, I got a "java heap space" exception. So I tried installing it using
this command:
----------------------------------------------------------------------------------------------
jython -J-Xmx1g -m pip install pillow.
----------------------------------------------------------------------------------------------
I know, you're right, 1g seems enormous ! But I still get java heap space
with 512mb...

And with 1g of memory, I receive this stack:
----------------------------------------------------------------------------------------------
c:\Tools\jython2.7.2\bin>jython -J-Xmx1g -m pip install pillow
[33mDEPRECATION: A future version of pip will drop support for Python 2.7.
[0m
Collecting pillow
  Using cached
https://files.pythonhosted.org/packages/b3/d0/a20d8440b71adfbf133452d4f6e0fe80de2df7c2578c9b498fb812083383/Pillow-6.2.2.tar.gz
[31m    ERROR: Complete output from command python setup.py egg_info: [0m
[31m    ERROR: Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File
"C:\Users\RGISRA~1\AppData\Local\Temp\pip-install-ctmgop\pillow\setup.py",
line 25, in <module>
        import mp_compile
      File "mp_compile.py", line 11, in <module>
        from multiprocessing import Pool, cpu_count
      File
"C:\Tools\jython2.7.2\Lib\site-packages\multiprocessing\__init__.py", line
64, in <module>
        import multiprocessing.patch
      File
"C:\Tools\jython2.7.2\Lib\site-packages\multiprocessing\patch.py", line 58,
in <module>
        class ConditionPatch(object):
      File
"C:\Tools\jython2.7.2\Lib\site-packages\multiprocessing\patch.py", line 61,
in ConditionPatch
        notify_all = threading._Condition.notifyAll.im_func
    AttributeError: 'module' object has no attribute '_Condition'
    ---------------------------------------- [0m
[31mERROR: Command "python setup.py egg_info" failed with error code 1 in
C:\Users\RGISRA~1\AppData\Local\Temp\pip-install-ctmgop\pillow\ [0m
[33mWARNING: You are using pip version 19.1, however version 20.3.4 is
available.
You should consider upgrading via the 'pip install --upgrade pip' command.
[0m
----------------------------------------------------------------------------------------------

Does any one able to install pillow on jython ? Or is it a pillow issue ?
Or my fault ?

Thank you all for your kind help !

Best regards,

Régis Ramillien