CODEWITHSUNDEEP
javaclasspath
maaartinus
maaartinus

Reputation: 46492

How to get a path a class is loaded from

I want to list some classes on the classpath, but I don't want all of them (moreover, scanning the whole classpath is pretty slow). Given a single ExampleClass, I want to get all classes residing in the same classpath entry (i.e., directory or JAR, other cases can be ignored). There's a single ClassLoader.

Using ExampleClass.class.getResource("/") does not work as I always get the first classpath entry, e.g.,

/whatever/build/classes/main/

ExampleClass.class.getResource(".") returns a child of the proper entry, e.g., 

/whatever/build/classes/test/somepackage/ExampleClass.class

which is something I could process to

/whatever/build/classes/test/

But I wonder if there's a better way than fooling around with strings.

Upvotes: 0

Views: 39

Answers (2)

Joop Eggen
Joop Eggen

Reputation: 109613

URL url = ExampleClass.getProtectionDomain().getCodeSource().getLocation();

Check for null however.

Upvotes: 2

Muhammad Hashim Shafiq
Muhammad Hashim Shafiq

Reputation: 653

Here is an example:

    package foo;
    public class Test
    {
        public static void main(String[] args)
        {
            ClassLoader loader = Test.class.getClassLoader();
            System.out.println(loader.getResource("foo/Test.class"));
        }
   }

Output is:

file:/C:/Users/Jon/Test/foo/Test.class

Upvotes: 0

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