Execute Jar from Java code

Question

I have this code that is supposed to run a executable jar, but whenever the code is executed nothing happens?

      try {
           proc = Runtime.getRuntime().exec("java -jar C://X-Dock//MP3Player.jar");
      } catch (IOException e1) {
           e1.printStackTrace();
      }

The JAR works fine if I run it manually, but that line of code just doesn't work. And I know for sure that the code is called.

Also you don't need to "double" forward-slashes in a string, only backslashes. — ZacWolf
– ZacWolf, Commented Jan 5, 2015 at 23:52
Have you tried running the jar from CMD or by creating .bat file? — Ondrej Tokar
– Ondrej Tokar, Commented Jan 5, 2015 at 23:53
@OndrejTokar Making it target a bat instead of a jar worked. Not sure why, but thanks! — Arman
– Arman, Commented Jan 5, 2015 at 23:58
I am not sure but I have faced very similar problem. The issue might be path to the file. Maybe you could also try placing the jar locally. — Ondrej Tokar
– Ondrej Tokar, Commented Jan 6, 2015 at 0:03

Bruno Ribeiro · Accepted Answer · 2015-01-06 00:04:10Z

1

If you has a JRE after version 5, java provides a process builder. So, try something like this:

final ProcessBuilder pBuilder = new ProcessBuilder("/java/path", "-jar", "your_jar.jar");
pBuilder.directory(new File("your/working/directory"));
final Process process = pBuilder.start();

"/java/path" is path for java installation, can be replaced by java, if java is in the environment variables.

See more at ProcessBuilder.

answered Jan 6, 2015 at 0:04

Bruno Ribeiro

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