Issues while Invoking Python process using java process builder

Question

I am using java process builder to start python process with one flag and with one argument as shown below. But i don't see any exception nor process starts up.

Command i want to run is

python oc_db5.py -c input.json

location of file oc_db5.py is

/opt/jvision/grpc/gui

My code is shown below

    processBuilder = new ProcessBuilder(

            Arrays.asList(
                    "python",
                    "oc_db5.py",
                    "-c",
                    "input.json"));

    processBuilder.directory(new File("/opt/jvision/grpc/gui"));

    processBuilder.start();

    logger.info("Process started ..." + new Date());

    int count = 0;
    BufferedReader br = new BufferedReader(new InputStreamReader(
            process.getInputStream()));

    while ((lineData = br.readLine()) != null) {

        System.out.println("line: " + ++count + " " + lineData);
        logger.info("line: " + ++count + " " + lineData);
    }
    process.waitFor();
    process.getErrorStream();
    process.waitFor();

    process.exitValue();

I can see that log file contains entry "process start..." but i don't really see that process is started. Wondering what i am missing.

Alex Baranowski · Accepted Answer · 2016-12-09 20:50:23Z

1

Can you check if python is in your PATH? I have similar problem with custom command long long time ago. You can use absolute path to try it :). You can also check you enviromental variables via

Map env = System.getenv();

If you are using Linux you can start process like "sleep 1000" then check it is present in system process table via "ps aux | grep sleep" or something like it :)

answered Dec 9, 2016 at 20:50

Alex Baranowski

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