Syntax error running Python script in Java Process

Question

I have a script in python that should receive two PDF files and output an image. It works fine in the terminal but when I try to run it in a Java process using process builder it gives me a syntax error and I am not sure why.

I am using python3 with the command (in the terminal):

python3 /pathToMyPythonScript/command_line.py /Users/myname/Desktop/one.pdf /Users/myname/Desktop/two.pdf > /Users/myname/Desktop/XXXXXXXXXXXXXXXXXXXXX.png

It works and produces the desired output.

also tried:

/usr/local/bin/python3 /pathtomypythonscript/command_line.py /Users/myname/Desktop/one.pdf /Users/myname/Desktop/two.pdf > /Users/myname/Desktop/XXXXXXXXXXXXXXXXXXXXX.png

and it also works fine.

When I call the same script in my java code using the following code:

Process p = new ProcessBuilder("/usr/local/bin/python3", fileOneLocation, fileTwoLocation, outputFileDestination).inheritIO().start();

all variables are declared and all files exist.

My eclipse console output is an error:

File "/Users/myname/Desktop/one.pdf", line 1
    %PDF-1.3
    ^
SyntaxError: invalid syntax

What am I missing here? It works fine in terminal but not in Java.

In your Java code, shouldn't there be the python file to run? Currently there only is a call to python and then passing the pdfs - but not your actual Python script — hage
– hage, Commented Mar 16, 2018 at 11:50
@hage From what I read Java process works with a command and not a script. You're probably thinking of a solution using Jython or so. — Henrique Ferreira
– Henrique Ferreira, Commented Mar 16, 2018 at 11:53
Nevermind @hage you were right. I feel so bad for not noticing something like this. Thank you. Forgot to add the scriptPathVariable in the Process Builder. — Henrique Ferreira
– Henrique Ferreira, Commented Mar 16, 2018 at 11:56
No. In your commandline example, you call python command_line.py one.pdf two.pdf But in your Java code there is no reference to your python script and the interpreter thinks that its first argument is the script - but it actually is a pdf file — hage
– hage, Commented Mar 16, 2018 at 11:56

hage · Accepted Answer · 2018-03-16 11:57:20Z

1

As an answer:

You forgot to mention your actual python script in the ProcessBuilder

answered Mar 16, 2018 at 11:57

hage

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