Null pointer when copying aspect

[dvojtise]

on my project I regularly have this exception
java.lang.NullPointerException
at fr.inria.diverse.commons.asm.shade.DirectoryShader.shadeFolder(DirectoryShader.java:64)
at fr.inria.diverse.commons.asm.shade.DirectoryShader.shade(DirectoryShader.java:36)
at fr.inria.diverse.melange.utils.AspectCopier.copy(AspectCopier.java:405)
at fr.inria.diverse.melange.ast.LanguageExtensions$25.accept(LanguageExtensions.java:1240)
at fr.inria.diverse.melange.ast.LanguageExtensions$25.accept(LanguageExtensions.java:1)
at java.lang.Iterable.forEach(Unknown Source)
at fr.inria.diverse.melange.ast.LanguageExtensions.copyAspects(LanguageExtensions.java:1244)
at fr.inria.diverse.melange.ast.LanguageExtensions.createExternalAspects(LanguageExtensions.java:945)
at fr.inria.diverse.melange.ui.builder.MelangeBuilder$4.accept(MelangeBuilder.java:236)
at fr.inria.diverse.melange.ui.builder.MelangeBuilder$4.accept(MelangeBuilder.java:1)
at java.lang.Iterable.forEach(Unknown Source)
at fr.inria.diverse.melange.ui.builder.MelangeBuilder.generateLanguages(MelangeBuilder.java:248)
at fr.inria.diverse.melange.ui.menu.GenerateLanguages$1.run(GenerateLanguages.java:58)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:119)

whe crashed like this, the aspect are not copied and some other stuff not generated (if I have used "generate all")

It should at least report a cleaner message indicating which aspect wasn't copied and not crash in order to continue the processing

I'm currently not sure about the exact reason of the crash itself. (maybe dependencies to classes that aren't copied ?)

[dvojtise]

OK, I found out the cause

I usually import in my worpspace a root project that helps me deal with git (for example renaming folder/projects)
unfortunatly, in this case the

ws.accept(new IResourceVisitor {
                override visit(IResource resource) throws CoreException {
                    if (resource instanceof IFile) {
                        val firstMatch = request.aspectRefs.findFirst

will also find the aspect in this project and add it to the input folders that need to be copied

obviously, the search scheme looking for a src-gen folder at the root of the root project will fail