in src/main/java/org/apache/sling/feature/resolver/FrameworkResolver.java [307:314]
private static BundleDescriptor getBundleDescriptor(ArtifactManager artifactManager, Artifact b) throws IOException {
final File file = artifactManager.getArtifactHandler(b.getId().toMvnUrl()).getFile();
if ( file == null ) {
throw new IOException("Unable to find file for " + b.getId());
}
return new BundleDescriptorImpl(b, file, -1);
}