Error: Could not find or load main class in python

Question

I am trying to run this command in Python:

java JSHOP2.InternalDomain logistics

It works well when I run it in cmd.

I wrote this in Python:

args = ['java', 
        r"-classpath", 
        r".;./JSHOP2.jar;./antlr.jar", 
        r"JSHOP2.InternalDomain", 
        thisDir+"/logistics" 
       ] 
    proc = subprocess.Popen(args, stdout=subprocess.PIPE) 
    proc.communicate() 

I have the jar files in the current directory.

but I got this error: Error: Could not find or load main class JSHOP2.InternalDomain

Does anyone know what the problem is? can't it find the jar files?

Answer 1

You can't count on the current working directory always being the same when running your Python code. Explicitly set a working directory using the cwd argument:

proc = subprocess.Popen(args, stdout=subprocess.PIPE, 
                        cwd='/directory/containing/jarfiles')

Alternatively, use absolute paths in your -classpath commandline argument. If that path is thisDir , then use that:

proc = subprocess.Popen(args, stdout=subprocess.PIPE, 
                        cwd=thisDir)