Run python file from java [duplicate]

Question

I am trying to run a python script using runtime in java, but the command doesn't work, I got this error:

Cannot run program "python": CreateProcess error=2, The system cannot find the file specified

Even i set the PATH variable with the executable python.

public void call(){

  String command= "python C:/Python27/lib2.py";       
   Process p = Runtime.getRuntime().exec(command);

}

PATH = "C:\Python27"

Can you run the command manually from command line? Can you please show us your PATH? — Tamas Rev
– Tamas Rev, Commented Sep 5, 2016 at 14:07
Make sure that python is in the PATH where you're running the build, or specify an absolute path to your python executable in the exec task. Then take a look at this — Jad Chahine
– Jad Chahine, Commented Sep 5, 2016 at 14:08
Yes, it works fine manually from command line, i already set the PATH, but the error still present — Elgallati Noreddine
– Elgallati Noreddine, Commented Sep 5, 2016 at 14:11
This might be a tokenizer problem. Could you try running exec with new String[] { "python", "C:/Python27/lib2.py" } as an argument? — Jorn Vernee
– Jorn Vernee, Commented Sep 5, 2016 at 14:46

Geo · Accepted Answer · 2016-09-05 14:09:30Z

1

Have a look at ProcessBuilder. The sample code shows:

ProcessBuilder pb =
   new ProcessBuilder("myCommand", "myArg1", "myArg2");
 Map<String, String> env = pb.environment();
 env.put("VAR1", "myValue");
 env.remove("OTHERVAR");
 env.put("VAR2", env.get("VAR1") + "suffix");
 pb.directory(new File("myDir"));
 File log = new File("log");
 pb.redirectErrorStream(true);
 pb.redirectOutput(Redirect.appendTo(log));
 Process p = pb.start();
 assert pb.redirectInput() == Redirect.PIPE;
 assert pb.redirectOutput().file() == log;
 assert p.getInputStream().read() == -1;

You could do env.put("PATH", "c://python/bin"); or wherever your python installation may be found, to ensure that python is found in path.

answered Sep 5, 2016 at 14:09

Geo

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1 Comment

Elgallati Noreddine Over a year ago

the same problem can not run th program "python"

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