Parse String timestamp to Instant throws Unsupported field: InstantSeconds

Here is how to get an Instant with a default time zone. Your String can not be parsed straight to Instant because timezone is missing. So you can always get the default one

DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

String timestamp = "2016-02-16 11:00:02";
TemporalAccessor temporalAccessor = formatter.parse(timestamp);
LocalDateTime localDateTime = LocalDateTime.from(temporalAccessor);
ZonedDateTime zonedDateTime = ZonedDateTime.of(localDateTime, ZoneId.systemDefault());
Instant result = Instant.from(zonedDateTime);

A simpler method is to add the default timezone to the formatter object when declaring it

final DateTimeFormatter formatter = DateTimeFormatter
                                    .ofPattern("yyyy-MM-dd HH:mm:ss")
                                    .withZone(ZoneId.systemDefault());
Instant result = Instant.from(formatter.parse(timestamp));