CODEWITHSUNDEEP
javajar
Mrab Ezreb
Mrab Ezreb

Reputation: 440

How to get the path and name of the current running jar?

There are plenty of folders that let you find the folder that the running jar is in, but how do I get the running jar? For example, if foo.jar is in C:/FOO/foo.jar, then how would I get the path C:/FOO/foo.jar, not C:/FOO. Also, I have no idea A: if the jar was moved to a different folder, B: If my jar was renamed, and C: if there are other jars in the same folder as mine. I want to get a File object of the currently running jar, which I am then going to be using (in some way) to replace that jar with a new version of my program. Can anyone help me with this? Thanks! EDIT: Wait a minute, would it be possible to, after finding the directory, scan through it looking for jar files, and in each jar file, check for a certain class/other file that is in my jar?

Upvotes: 2

Views: 7281

Answers (3)

Mrab Ezreb
Mrab Ezreb

Reputation: 440

Alright, I got it figured out. It's something like this:

File dir = new File(YourMainClass.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath());
String jar = System.getProperty("java.class.path");
File jarFile = new File(dir, jar);

Thanks everyone! EDIT: Also, if I ever end up with multiple jars in the classpath, I would need something to check that I got the right one.

Upvotes: 5

Giulio Biagini
Giulio Biagini

Reputation: 920

In order to get the path of jar, use:

File dir = new File(YourMainClass.class.getProtectionDomain().getCodeSource().getLocation().toURI().getPath());

To get the main class name, use:

StackTraceElement[] stack = Thread.currentThread().getStackTrace();
StackTraceElement main = stack[stack.length - 1];
String mainClass = main.getClassName();

Then, use them all together:

File f = new File(dir, mainClass);

Upvotes: 0

Aslam a
Aslam a

Reputation: 759

You can use find file JAVA API.

What you want is File.listFiles(FileNameFilter filter).

That will give you a list of the files in the directory you want that match a certain filter.

The code will look similar to

Upvotes: -1

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