for ( String xmlFile : xmlFiles ) {
	InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream( xmlFile );
	configuration.addInputStream( is );
}

for ( String xmlFile : xmlFiles ) {
	try (InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream( xmlFile )) {
		configuration.addInputStream( is );
	}
	catch (IOException e) {
		throw new IllegalArgumentException( e );
	}
}