Find Self location of a Jar file [duplicate]

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
– yegor256, Commented Feb 22, 2012 at 17:16
Thanks @yegor256 but I am not uni testing. I am executing the jar itself. — Tapas Bose
– Tapas Bose, Commented Feb 22, 2012 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
– bohdan_trotsenko, Commented Oct 8, 2013 at 18:34

nullpotent · Accepted Answer · 2012-02-22 17:04:59Z

7

There is a way:

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

answered Feb 22, 2012 at 17:04

nullpotent

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2 Comments

Tapas Bose Over a year ago

Thanks I have added a code. But it is throwing NullPointerException

Deepak Bhatia Over a year ago

@TapasBose in what case you got NPE can you elaborate and how you solved it?

rascio · Accepted Answer · 2012-02-22 17:19:56Z

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

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?

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