Java Process InputStream in Linux machine

Question

I'm using Java Process as below :

Runtime rt = Runtime.getRuntime();
    try {
        Process pr = rt.exec(cmd);

        response = IOUtils.toString(pr.getInputStream(), "UTF-8");
        response = response.substring(2, response.length()-4);
        logger.debug("response :" + response);
    } catch (IOException e) {
        logger.error(e);
        e.printStackTrace();
    }

I can see the loggers in my local machine(Mac OSX). But when I run the same program in a Redhat Linux machine, I'm having problem seeing the logs. I don't have any clue whats happening after pr.getInputStream() . Having a logger before that statement is working fine. I want to see the response of the exec(cmd) . How can I achieve this. I suspect something is wrong when I'm trying to read the InputStream.

Answer 1

Try reading input stream and error stream in two threads other than the one that launched the process. I have seen processes gets stuck writing to error or output streams if no one is reading what they are writing.