Error importing jpype module

Question

Could someone please advise in resolving the below error? Python 3.5.1 / jpype1-py3 0.5.5.2 installed on 64 bit windows machine. I've cannot find _jtype anywhere in Lib or Lib/site-packages.

Regards Steve

>>> import jpype
Traceback (most recent call last):
  File "", line 1, in 
    import jpype
  File "C:\Program Files\Python35\lib\site-packages\jpype\__init__.py", line 18, in 
    from ._jpackage import *
  File "C:\Program Files\Python35\lib\site-packages\jpype\_jpackage.py", line 18, in 
    import _jpype
ImportError: DLL load failed: The specified module could not be found.

How do you know it is installed? Do you know where it is installed? — tmthydvnprt, Mar 16 '16 at 11:41
@Tales its installed via pip and I can see the lib folder in Lib/site-packages. — swsupp, Mar 16 '16 at 17:31
@tmthydvnprt when I run pip search jpype, its returns : INSTALLED: 0.5.5.2 (latest). I can see the module in Lib/site-packages — swsupp, Mar 16 '16 at 17:38

score 0 · Answer 1 · answered Mar 16 '16 at 18:16

According to this thread, you need to make sure setup.py is pointing to the correct jvm directory. looking into setup.py of you can see that it searches for JAVA_HOME system variable:

java_home = os.getenv('JAVA_HOME', '')
found_jni = False
if os.path.exists(java_home):
    platform_specific['include_dirs'] += [os.path.join(java_home, 'include')]
# The code goes on

It may be that you didn't configure this system variable.

Since you installed via pip, and probalby didn't touch te setup.py file, I recommend you to do the following:
1-) Uninstall the package, and delete the build directories
2-) Set JAVA_HOME variable following this
3-) Download JPype manually from github and install it using python setup.py install

Good luck, tell me if it works

It looks like this is the problem. I've got as far as compiling now - Its trying to build _jpype but I don't have a C++ compiler installed (yet). — swsupp, Mar 16 '16 at 19:52

Error importing jpype module

1 Answers1