python subprocess running jar gives error

Question

Running this command in the terminal works fine:

java -jar file.jar --arg1 --arg2 pathTofile

When I then try to do this from the python code using following code:

subprocess.call(['java', '-jar', 'file.jar', '--arg1' , '--arg2' , 'pathTofile'])

I get an IllegalArugmentException for --arg1.

Any ideas on why this could generate a problem?

Linux and cannot debug the Java program, the java one works fine — benst
– benst, Commented Oct 18, 2012 at 12:05
the code in the question is fine. your answer indicates that the issue is that you put several command-line parameters into a single list item. The rule is simple: one parameter per item. — jfs
– jfs, Commented Oct 4, 2014 at 12:45

Amir · Accepted Answer · 2020-04-18 22:05:14Z

1

@Benst - I encountered the same problem, this is what works for me:

subprocess.call(['java', '-Dparam1=paramValue1', '-Dparam2=paramValue2', '-jar', 'filename.jar']);

Cheers!

edited Apr 18, 2020 at 22:05

Amir

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answered Oct 2, 2014 at 10:34

switch_java3

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3 Comments

alemol Over a year ago

Sorry but this is not the solution. I have This: ['java', '-jar', 'pdfbox-app-1.8.8.jar', 'ExtractText', 'Content.pdf', 'Content.pdf.txt'] and does not work. It gives Usage: java [-options] class [args...]. ...

switch_java3 Over a year ago

@alemol - your usage is incorrect, look closely at the syntax...'-jar' and the 'filename.jar' should be at the end of the code...

alemol Over a year ago

Following the correct syntax: subprocess.call(['java', 'ExtractText', 'somepdf.pdf', 'sometxt.txt', '-jar', 'pdfbox-app-1.8.8.jar']) gives: Could not find or load main class ExtractText. So, How to call a module (with this usage) in python subprocess.call?: java -jar pdfbox-app-x.y.z.jar ExtractText [OPTIONS] <inputfile> [Text file]

benst · Accepted Answer · 2012-10-18 12:11:29Z

0

Ok I figuered it out. When using the subprocess routine in python you need to quote the option and concurrent value seperatly

eg:

subprocess.call(['java', '-jar', 'file.jar', '-option', 'valueForThisOption', '-option', 'valueForThisOption', 'pathToFile'])

putting the -option and value in one quote generates this error. I have read somewhere that you can only put the -option and value in one quote if you put shell=True at the end. (untested)

answered Oct 18, 2012 at 12:11

benst

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1 Comment

glglgl Over a year ago

Depending on the called program, you can write '--arg=itsParameter' in one argument.

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