@Test
public void testMd5sum2() throws Exception {

  final String javaHome = System.getProperty("java.home");
  final String sum =
      timeIt(
          () -> {
            File jar = new File(javaHome, "/lib/rt.jar");
            if (!jar.exists()) {
              jar = new File(javaHome, "/lib/jrt-fs.jar");
            }
            return FileUtils.getChecksum(jar.getCanonicalFile());
          });
  System.out.println(sum);
}