Not working for packages in a jar file?

Running this library directly in let’s say IntelliJ IDEA works as expected, but when running the same code from a jar file, the Exception below is thrown.

Exception in thread "[thread_name]" java.lang.NoClassDefFoundError: io/github/lukehutch/fastclasspathscanner/FastClasspathScanner
        at vendor.objects.CommandLinksContainer.<init>(CommandLinksContainer.java:41)
        at app.BotCommandsLinker$1.<init>(BotCommandsLinker.java:14)
        at app.BotCommandsLinker.createLinksContainer(BotCommandsLinker.java:14)
        at vendor.abstracts.CommandsLinker.getContainer(CommandsLinker.java:20)
        at vendor.objects.CommandsRepository.getContainer(CommandsRepository.java:21)
        at app.CommandRouter.run(CommandRouter.java:147)
Caused by: java.lang.ClassNotFoundException: io.github.lukehutch.fastclasspathscanner.FastClasspathScanner
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        ... 6 more

Here is the code that runs this issue in a jar file :

ScanResult results = new FastClasspathScanner(linksPackage).strictWhitelist().scan();
		
List<String> classNames = results.getNamesOfAllClasses();
	
List<Class<?>> linkableClasses = results.classNamesToClassRefs(classNames);
	
ArrayList<Link> links = new ArrayList<>();
	
linkableClasses.forEach(linkableClass -> {
		
	if(LinkableCommand.class.isAssignableFrom(linkableClass)){
			
		links.add(new Link((Class<LinkableCommand>)linkableClass));
			
	}
		
});

The .verbose() does output alot of data in “local mode” (not in a jar file) but no information is thrown (except this error stack) when running from the jar file.

P.S. : I know that I may not be using the scanner at its full potential (I’m searching for all the classes and then filtering those with the interface LinkableCommand while the scanner seems to have ways to do that automatically) but I couldn’t get it working.

If you want to to send the .verbose() log of the working conditions (again, when not in a jar file), just let me know!

[lukehutch]

@V-ed no problem at all! I’d rather know about every little thing like this in case it’s a bug in FCS. Glad you found the cause!

[V-ed]

Well, I feel kinda dumb now.

I rechecked the artifact created by IntelliJ IDEA and the build process wasn’t including your FastClasspathScanner library into the jar file.

As you thought, it was indeed a packaging error!

Thanks alot for the quick answer and sorry for making an issue which wasn’t cause by your library but rather my lack of knowledge on IntelliJ’s artifact building process! Your library is really useful!