How to get the path of executed .jar file?

Question

How do I get the path of a an executed .jar file, in Java?

I tried using System.getProperty("user.dir"); but this only gave me the current working directory which is wrong, I need the path to the directory, that the .jar file is located in, directly, not the "pwd".

From where? Inside the JAR file itself? – BalusC Mar 01 '10 at 13:25 — BalusC, Mar 01 '10 at 13:25
Yes, from code inside the JAR file itself. – Zolomon Mar 01 '10 at 13:26 — Zolomon, Mar 01 '10 at 13:26

elou · Accepted Answer · 2010-03-01T14:49:46.570

2

Could you specify why you need the path?
If you need to access some property from the jar file you should have a look at ClassLoader.getSystemClassLoader();
don't forget that your classes are not necessary store in a jar file.


// if your config.ini file is in the com package.
URL url = getClass().getClassLoader().getResource("com/config.ini");
System.out.println("URL=" + url);

InputStream is = getClass().getClassLoader().getResourceAsStream("com/config.ini");
try {
    if (is != null) {
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        String line;
        while ((line = br.readLine()) != null) {
            System.out.println(line);
        }
    }
    else {
        System.out.println("resource not found.");
    }
}
catch (IOException e) {
    e.printStackTrace();
}

regards.

edited Mar 01 '10 at 14:49

answered Mar 01 '10 at 13:35

elou

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Need to get access to the config.ini file that is stored in the same directory as the .jar file. – Zolomon Mar 01 '10 at 13:37
Have a look at ClassLoader#getResource / #findResource. – elou Mar 01 '10 at 13:55
not sure if it can work if the config file is external to the jar. – PhiLho Mar 01 '10 at 13:57
This only works if the resource is in your classpath. If not you, to know where it is located and create an InputStream to access its content. – elou Mar 01 '10 at 14:09

score 0 · Answer 2 · answered Mar 01 '10 at 13:28

Taken From Java-Forumns:

        public static String getPathToJarfileDir(Object classToUse) {
        String url = classToUse.getClass().getResource("/" + classToUse.getClass().getName().replaceAll("\\.", "/") + ".class").toString();
        url = url.substring(4).replaceFirst("/[^/]+\\.jar!.*$", "/");
        try {
            File dir = new File(new URL(url).toURI());
            url = dir.getAbsolutePath();
        } catch (MalformedURLException mue) {
            url = null;
        } catch (URISyntaxException ue) {
            url = null;
        }
        return url;
      }

This does not work, returns the path to the JRE when used as instructed. Thanks though! — Zolomon, Mar 01 '10 at 13:36

PhiLho · Answer 3 · 2010-03-01T13:56:10.890

0

Perhaps java.class.path property?

If you know the name of your jar file, and if it is in the class path, you can find its path there, eg. with a little regex.

edited Mar 01 '10 at 13:56

answered Mar 01 '10 at 13:29

PhiLho

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How to get the path of executed .jar file?

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