throw new UnsupportedOperationException("Cannot get runtime version used when running on Java <9");
        }
    }

    @SuppressWarnings("Since15")
    private static class MultiReleaseSupportingJar extends JarCompat {
        MultiReleaseSupportingJar(File jarFile) throws IOException {
            // Set up the MR-JAR properly when running on Java 9+.
            super(new JarFile(jarFile, true, JarFile.OPEN_READ, JarFile.runtimeVersion()));