Using CMD as a Process

Question

I\'m trying to run commands straight through the CMD on Windows (Terminal on Linux). I have the following code. It\'s acting very strangely. First, when run the program does

Answer 1

There could be a couple of things going on. One is that arguments are not getting passed correctly the way you are executing the process. The other, like @zacheusz mentioned, is that output may be coming out from the error stream instead of the input stream.

ProcessBuilder helps with both these things, allowing easy construction of a list of commands and the ability to merge input and error stream. I recommend trying using it:

Process p = null;
try {
    List cmd = new LinkedList();
    cmd.add("executable");
    cmd.add("-arg1");
    cmd.add("value1");
    cmd.add("-arg2");
    ProcessBuilder pb = new ProcessBuilder(cmd);
    pb.redirectErrorStream(true);
    p = pb.start();
    BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
    while (input.ready()) {
        String line = input.readLine();
        System.out.println("From process: "+line);
    }
    input.close();
} catch (IOException e) {
    this.logMessage("IOException caught: "+e.getMessage());
    e.printStackTrace();
}