How to make a java program to print both out.println() and err.println() statements?

Question

I have written the java code below, which executes another java program named \"Newsworthy_RB\".

Newsworthy_RB.java contains both the System.out.printlln() and Syste

Answer 1

You need to pipe the output of both streams in a separate threads. Example code from here:

Process p = Runtime.getRuntime().exec(cmd.array());
copyInThread(p.getInputStream(), System.out);
copyInThread(p.getErrorStream(), System.err);
p.waitFor();
return p.exitValue();

private void copyInThread(final InputStream in, final OutputStream out) {
    new Thread() {
        public void run() {
            try {
                while (true) {
                    int x = in.read();
                    if (x < 0) {
                        return;
                    }
                    if (out != null) {
                        out.write(x);
                    }
                }
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    } .start();
}