java.time.Instant.toString() nanosecond bug

[Arne Ploese]

Hi,

I'm runnig 

openjdk version "1.8.0_111"
OpenJDK Runtime Environment (build 1.8.0_111-8u111-b14-3-b14)
OpenJDK 64-Bit Server VM (build 25.111-b14, mixed mode)

and I encounter the following bug.

TestCase:

    @Test
    public void testNanos() {
        DateTimeFormatter formatter =
DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss.nnnnnnX");
        Instant instant = Instant.ofEpochSecond(0, 123400);
        assertEquals(0, instant.getEpochSecond());
        assertEquals(123400, instant.getNano());
        assertEquals("1970-01-01T00:00:00.123400Z",
formatter.format(ZonedDateTime.ofInstant(instant, ZoneId.of("Z"))));
        assertEquals("1970-01-01T00:00:00.123400Z",
instant.toString());
    }
    
The test fails on the last assertEquals with:

org.junit.ComparisonFailure: expected:<1970-01-01T00:00:00.[]123400Z>
but was:<1970-01-01T00:00:00.[000]123400Z>

the nanos getting three leading zeros.

Arne Plöse