Find Self location of a Jar file

Question

Is there any way by which we can find the current location from where the jar is forked, programmatically? Say I am executing a Jar from D:/Jars/myjar.jar, so can I get that path from the code?

@AljoshaBre I tried this

try {
        File file = new File(getClass().getProtectionDomain().getCodeSource().getLocation().toURI().getPath());
        System.out.println(file.getAbsolutePath());
    } catch (Exception e1) {

        e1.printStackTrace();
    }

Is throwing NPE. :(

But

System.out.println(getClass().getProtectionDomain().getCodeSource().getLocation().getPath());

is showing client.jar only. Not the absolute path. It is inside a Jar.

Maybe it's throwing NPE because your code is **not** yet packaged into a JAR file during unit testing? — yegor256, Feb 22 '12 at 17:16
Thanks @yegor256 but I am not uni testing. I am executing the jar itself. — Tapas Bose, Feb 22 '12 at 17:17
You need split the sequence of calls (`getClass().getProtectionDomain().`..) in multiple lines in order to know what exactly returned `null` instead of expected instance. — bohdan_trotsenko, Oct 08 '13 at 18:34

score 7 · Accepted Answer · answered Feb 22 '12 at 17:04

7

There is a way:

return new File(ClassA.class.getProtectionDomain().getCodeSource().getLocation().toURI().g‌etPath());

answered Feb 22 '12 at 17:04

nullpotent

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1

Thanks I have added a code. But it is throwing NullPointerException – Tapas Bose Feb 22 '12 at 17:13
@TapasBose in what case you got NPE can you elaborate and how you solved it? – Deepak Bhatia Jan 04 '14 at 08:05

score -4 · Answer 2 · answered Feb 22 '12 at 17:19

-4

If you execute it as java -jar D:/Jars/myjar.jar if you do

new File("afile").getAbsolutePath();

it will return D:/Jars/afile and the you can just do a substring.

The new File create the file from the folder which the jar is, so if you import this JAR in an application this method doesn't work.

Sorry I've just tried...it isn't true :P it return the path of where you called the 'java' command

answered Feb 22 '12 at 17:19

rascio

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Thanks, If I execute from cmd `java -jar "C:\Users\Tanmoy\Desktop\Movie Library.jar"` then `System.out.println(new File("afile").getAbsolutePath());` prints `C:\Users\Tanmoy\afile` but without `Desktop` how can I substring? – Tapas Bose Feb 22 '12 at 17:28

Find Self location of a Jar file

2 Answers2