Why can't Fantom find the resource in a jar?

Question

I've recently gotten started using Fantom. I've got a jar file that contains a resource (svg image, in this case). I can use the classes from the jar just fine, but the resource won't load: Thread.currentThread().getContextClassLoader().getResourceAsStream("name") returns null. When I use this exact same jar in a Java-only context, it can find the resource just fine.

Any suggestions on how to debug or even solve this issue would be much appreciated.

I don't know anything about Fantom (looks cool from a quick glance though), but it seems there is some Classloader manipulation/isolation going on. Might have something to do with something in this area, for example: http://fantom.org/sidewalk/topic/1208. — Charlie Collins, Nov 22 '10 at 17:09
Try addressing the resource with its full path starting with / and see if that helps. — Knubo, Nov 22 '10 at 18:34
What does the "full path" mean? The resource is in a jar file. — Jorn, Nov 23 '10 at 15:13
So if I undersand this correctly you want to access a .jar file from Fantom and that .jar file contains a svg? Or is it the other way around? — Daniel Fath, Mar 17 '11 at 09:13

score 2 · Answer 1 · answered Feb 05 '11 at 16:41

2

Does it have to be in a Jar? If you stick it directly in your Pod, you can use access files like this:

file := Pod.find("myPod").file(`/path/to/file.ext`)

answered Feb 05 '11 at 16:41

afrankvt

181
3

It's in a jar I want to use, I don't have control over it. – Jorn Feb 05 '11 at 18:27

score 1 · Accepted Answer · edited Mar 09 '12 at 20:33

1

The wrong part is Thread.currentThread().getContextClassLoader()

Java: AnyClassFromJar.class.getClassLoader() works

Fantom: Class.forName("AnyClassFromJar").getClassLoader() should work

edited Mar 09 '12 at 20:33

frictionlesspulley

11,070
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answered Jul 03 '11 at 14:32

Alex Panchenko

452
2
6

score 0 · Answer 3 · answered Apr 05 '13 at 10:29

0

Try '/name' instead of 'name'. That works for me (in Java).

answered Apr 05 '13 at 10:29

Paul

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Daniel Fath · Answer 4 · 2011-07-03T19:32:25.117

If I recall correctly, .jar files can't be accessed for resoruces but since .jar files are nothing more than Zip files with fancy extension you can open them like that.

Here is my folder structure for the example (but any structure will do).

ExampleDir
 |
 +--- TestZip.fan
 +--- testOpen.jar
       |
       +--- META-INF
       |     +--- email.png
       |     ...
       |...

And you open the testOpen.jar like this:

class TestZip
{
  static Void main(Str[] args)
  {
    jar := Zip.open(File(`testOpen.jar`))
    png := jar.contents[`/META-INF/email.png`].readAllBuf
    jar.close
  }
}

EDIT: Having a discussion about this on Fantom boards it seems that this example should work.

buff := Interop.toFan(Class.forName("net.testOpen.Foo").getClassLoader().getResourceAsStream("email.png")),4096)

Why can't Fantom find the resource in a jar?

4 Answers4