DLL load failing for windows platform and python >=3.9.8 and 3.10

[petrushy]

• I read the conda-forge documentation and could not find the solution for my problem there.

Issue:

JCC-feedstock tests are failing due to not finding DLL files in windows, when python version is 3.10 or 3.9.8 or higher. 3.9.7 works. This is related to orekit-feedstock as well, which uses JCC to build. With orekit (currently version on conda-forge) it can be seen that if manually downgrading python to 3.9.7 (no other packages) it works, while at 3.9.9 it does not. It work well on other platforms.

Issue for JCC: conda-forge/jcc-feedstock#58
PR for debugging: conda-forge/jcc-feedstock#58

Any help appriciated

[isuruf]

Python 3.8 changed the DLL resolution order https://docs.python.org/3/whatsnew/3.8.html#bpo-36085-whatsnew
We reverted this patch as many extensions were failing, but restored this behaviour in 3.9.9+ and 3.10.0+
as enough time had passed since this change in cpython upstream.
You should use os.add_dll_directory to add the path to the jvm.dll to the top of jcc\__init__.py.

[petrushy]

Many thanks! Works indeed!