Redirection with Runtime.getRuntime().exec() doesn't work

Question

I need to execute a command from a program. The command line is ok, I tried it in the terminal, but it doesn\'t work in the program.

I add a copy from my code:

Answer 1

If you have Java 7, it's easier:

Process p = new ProcessBuilder()
    .command("exiftool", "-a", "-u", "-g1", "-j",
             new File("videos", filename).toString())
    .redirectOutput(new File("metadata", filename + ".json"))
    .start();

This falls under "solution 2", but the runtime library takes care of the boilerplate.