Java: find current working JAR

Question

I know that the system property "user.dir" returns the current working directory; the directory containing that file that is currently running.

I am wondering, how would I be able to go one step farther? I need to find the current working file. I am writing a little app that is kind of like an auto-updater, and I need to know the file that needs to be updated. For example, if I run a file from C:/test.jar I want to actually know, in code, that the current location of the file that is running is C:/test.jar so that I can write (new) data to it.

I've tried an approach like this:

    ClassLoader loader = Test.class.getClassLoader();
    System.out.println(loader.getResource("Test.class"));

However, it prints out:

3/5/12 7:50:16.914 PM [0x0-0x31031].com.apple.JarLauncher: rsrc:Test.class

(I am running this on a Mac - I got that line from the Console). Any help is greatly appreciated. Thanks!

Duplicate question: http://stackoverflow.com/questions/320542/how-to-get-the-path-of-a-running-jar-file — Diego, Mar 06 '12 at 02:01
`path.substring(0, path.lastIndexOf("/") + 1);` will take care of that. — Gian, Mar 06 '12 at 02:08
Diego was correct, the *non* accepted answer from Fab is working (at least working on Ubuntu I just tested it): http://stackoverflow.com/a/6849255/1012381 — JScoobyCed, Mar 06 '12 at 02:34

score 3 · Accepted Answer · edited May 23 '17 at 10:24

3

With credits to Fab in the following post: Jar path+name from currently running jar

String path = Test.class.getProtectionDomain().getCodeSource().getLocation().getPath();
String decodedPath = URLDecoder.decode(path, "UTF-8");

edited May 23 '17 at 10:24

Community

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answered Mar 06 '12 at 02:36

JScoobyCed

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Ah, test is the current class. – thomasa88 Dec 17 '13 at 10:40

score 0 · Answer 2 · answered Mar 06 '12 at 03:03

0

This will print the current file's path.

File f = new File(MyClass.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath());
        System.out.println(f.getPath());

answered Mar 06 '12 at 03:03

John Eipe

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Java: find current working JAR

2 Answers2