Error passing arguments from Java to Python -

i'm calling on python modules java. module using numpy, i'm using runtime.getruntime().exec() call python. in java doing this:

file python = new file("/usr/bin/python2.7"); file script = new file("/opt/my_custom_script.py"); string[] cmdarray = new string[] { python.tostring(), script.tostring(),     "-i infile.txt", "-o outfile.txt" }; process p = runtime.getruntime().exec(cmdarray); p.waitfor(); if (p.exitvalue() != 0) {     throw new exception(scriptname + " failed exit code " + p.exitvalue()); } 

and in python i've gotten far:

def main(argv):     try:         opts, args = getopt.getopt(argv, "i:o:")     except getopt.getopterror err:         print(err)         sys.exit(128) # made number know when happens      sys.exit(0)  if __name__ == "__main__":     main(sys.argv[1:]) 

every time run keep on getting error number made up, , python script runs no further. calling on python directly (in bash) gives me no problems.

where disconnect? how go troubleshooting/debugging this?

your problem passing 2 options 2 script rather 4 getopt expects. is, -i infile.txt treated 1 option, not, getopt expects, 2 options -i , infile.txt, , same thing happening -o outfile.txt. can fix replacing line:

string[] cmdarray = new string[] { python.tostring(), script.tostring(), "-i infile.txt", "-o outfile.txt" }; 

with line:

string[] cmdarray = new string[] { python.tostring(), script.tostring(), "-i", "infile.txt", "-o", "outfile.txt" }; 

notice -i , infile.txt separate array elements, -o , -outfile.txt.