TypeError: expected str, bytes or os.PathLike object, not NoneType

[rbogusze]

Unable to install pemja on raspberry pi, tried with python 3.7 and 3.9

Steps to reproduce:

$ virtualenv -p /usr/bin/python3.9 venv3.9
$ source venv3.9/bin/activate      
$ python --version
Python 3.9.0
$ pip --version
pip 22.1.1 from /home/pi/venv3.9/lib/python3.9/site-packages/pip (python 3.9)

$ pip install pemja

Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting pemja
  Downloading pemja-0.1.5.tar.gz (32 kB)
  Preparing metadata (setup.py) ... error
  error: subprocess-exited-with-error

  × python setup.py egg_info did not run successfully.
  │ exit code: 1
  ╰─> [10 lines of output]
      Traceback (most recent call last):
        File "<string>", line 2, in <module>
        File "<pip-setuptools-caller>", line 34, in <module>
        File "/tmp/pip-install-iqprsatx/pemja_afa58ffaf082492bb729b5377e1491da/setup.py", line 185, in <module>
          include_dirs=get_java_include() + ['src/main/c/pemja/core/include'] + get_numpy_include(),
        File "/tmp/pip-install-iqprsatx/pemja_afa58ffaf082492bb729b5377e1491da/setup.py", line 112, in get_java_include
          inc = os.path.join(get_java_home(), inc_name)
        File "/home/pi/venv3.9/lib/python3.9/posixpath.py", line 76, in join
          a = os.fspath(a)
      TypeError: expected str, bytes or os.PathLike object, not NoneType
      [end of output]

  note: This error originates from a subprocess, and is likely not a problem with pip.
error: metadata-generation-failed

[lucasfonsecads]

Same error here, someone resolved this?

[zhjdotxmsme]

on window platform same error as is, but install successful on macos platform

[lucasfonsecads]

@alexzhu0592 Could you share how you resolved it on macOS?

[zhjdotxmsme]

@alexzhu0592 Could you share how you resolved it on macOS?

no errors on macos, just install by normal way like pip install pemja

[zhjdotxmsme]

@alexzhu0592 Could you share how you resolved it on macOS?

Maybe you can check your jdk version or python version which doc suggests

[HuangXingBo]

What's the os and hardware? m1 chip?

[andrew-nippard]

Seems to be an issue with how environment variable JAVA_HOME is set on some machines (i.e. I'm using a M1 chip + Linux).

The below command worked for me:
export JAVA_HOME=/usr/lib/jvm/java-11-openjdk-arm64

[Haaroon]

Okay so i did alot of testing with @jamesalford and it seems this is an error because of python 3.10.

If you install with python3.9 pemja installs fine.

it has nothing to do with java_home being set or not, but its a python issue

Python3.10 works if you set a JAVA_HOME to a working java, otherwise it crashes with NoneType

[YasuoStudyJava]

well，I met the issue in Python3.7，and because the source code of pemja set to find 'JAVA_HOME', so I set 'JAVA_HOME' to solve the problem. Then install pemja successfully.