Loading Files SpringBoot-Fatjar with Java8 NIO.2

ReadFile.java

public static InputStream readFileInClasspath2InputStream(String folderWithEndingSlash, String fileName) throws BusinessException {
	InputStream inputStream = null;
	try {
		Path filePath = buildPath(folderWithEndingSlash, fileName);
		inputStream = Files.newInputStream(filePath);
	} catch (Exception exception) {
		throw new BusinessException(ERROR_MSG_START + exception.getMessage(), exception);
	}
	return inputStream;		
}

private static Path buildPath(String folderWithEndingSlash, String fileName) throws URISyntaxException, BusinessException, IOException {
	URI fileUri = buildFileUri(folderWithEndingSlash, fileName);
	Map<String, String> env = new HashMap<>(); 
	env.put("create", "true");
	FileSystems.newFileSystem(fileUri, env);
	return Paths.get(fileUri);
}	
	
private static URI buildFileUri(String folderWithEndingSlash, String fileName) throws URISyntaxException, BusinessException {
	URL fileInClasspath = FileUtils.class.getClassLoader().getResource(folderWithEndingSlash + fileName);
	if(fileInClasspath == null)
		throw new BusinessException("Datei nicht gefunden!");
	return fileInClasspath.toURI();
}