Java - How to find out which Jar file an import comes from?

Question

The project I'm working on has about 10 jar files as libraries. At the top of one of the files there's an import statement like:

import jpe.nar.crat.maker.ObjectMakerFactory;

Is there a way to tell which Jar file it comes from?

(I'm using Netbeans if that matters.)

Answer 1

You can use CodeSource#getLocation() for this. The CodeSource is available by ProtectionDomain#getCodeSource(). The ProtectionDomain in turn is available by Class#getProtectionDomain().

URL location = ObjectMakerFactory.class.getProtectionDomain().getCodeSource().getLocation();
System.out.println(location.getPath());
// ...

Answer 2

Have you tried doing a 'Open Declaration' on the class? In Eclipse, when you do it, it opens a window that shows the name of the jar and tells you that this jar has 'No Source Attachment'. I am hoping something similar should happen for NetBeans.

Thanks, R