Python ImportError when calling Python script from Java

Question

First off, there is a similar question here that wasn't ever really resolved.

I have a Python script that I want to execute from within my Java code. When I run the Python script on its own, it works properly. When I try to execute it from a Java process, I get an ImportError:

Traceback (most recent call last):
  File "address_to_geocode.py", line 3, in <module>
    from omgeo import Geocoder
ImportError: No module named omgeo

Per a suggestion from the linked question, I appended a direct path to the module in my Python import section to make sure the interpreter knows where to look, yet it still won't work:

import sys, os
sys.path.append('/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/omgeo')
from omgeo import Geocoder

My next move was to call the python script from a bash script (which again, works on its own), but when I call the bash script from Java, the same error persists. The issue, therefore seems to be on Java's end. Here is my java code:

    Process p = runner.exec("python address_to_geocode.py");

    BufferedReader stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
    BufferedReader stdError = new BufferedReader(new InputStreamReader(p.getErrorStream()));
    String stdReader = null;
    //Read output of command:
    while((stdReader = stdInput.readLine())!=null) {
        System.out.println(stdReader);
    }

    //Read any command errors:
    while((stdReader = stdError.readLine())!=null) {
        System.out.println(stdReader);
    }
    p.waitFor();

Is there anything wrong with my Java code or is this a bug? I appreciate any pointers.

Hi, it seems to me you need give full path to python script at Process p = runner.exec("python address_to_geocode.py"); — volkinc
– volkinc, Commented Feb 12, 2015 at 21:01
I have tested it in Windows Vista 32, jre1.8.0_20 and python 2.7.5 and it works alright with: final ProcessBuilder pb = new ProcessBuilder("python", "d:\\address_to_geocode.py"); — rafalopez79
– rafalopez79, Commented Feb 12, 2015 at 21:03
@rafalopez79 using the following: ProcessBuilder pb = new ProcessBuilder("python",absolute_file_path); Process p = pb.start(); the error persists... full path and all — TayTay
– TayTay, Commented Feb 12, 2015 at 21:06

TayTay · Accepted Answer · 2015-02-12 21:11:34Z

4

I solved it. It looks like ProcessBuilder requires the full path not only to the python file itself, but to python:

ProcessBuilder("/Library/Frameworks/Python.framework/Versions/2.7/bin/python",absolute_file_path);

This solves the issue.

answered Feb 12, 2015 at 21:11

TayTay

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Comments

Mick Lin · Accepted Answer · 2016-10-08 20:26:04Z

1

Find your python bin location

 $ cat ~/.bash_profile

Java code

 ProcessBuilder pb = new ProcessBuilder("/Users/micklin/anaconda2/bin/python","sentiment.py",done.toString());

code above is put in TweetFeeder.java so that .py file can be put under the project root

edited Oct 8, 2016 at 20:26

answered Oct 8, 2016 at 20:14

Mick Lin

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