FULL PRODUCT VERSION :
java version "1.8.0_111"
Java(TM) SE Runtime Environment (build 1.8.0_111-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.111-b14, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
LocalDateTime ldtn = LocalDateTime.now();
DateTimeFormatter fmtr = DateTimeFormatter.ISO_INSTANT;
String tmStr = ldtn.format(fmtr);

this code lines cause Exception "Exception in thread "main" java.time.temporal.UnsupportedTemporalTypeException: Unsupported field: InstantSeconds"

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Get any LocalDateTime and attempt format it by predefined formatter DateTimeFormatter.ISO_INSTANT

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
correct formatted String as the result of format method call
ACTUAL -
throwed Exception

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.time.temporal.UnsupportedTemporalTypeException: Unsupported field: InstantSeconds
at java.time.LocalDate.get0(Unknown Source)
at java.time.LocalDate.getLong(Unknown Source)
at java.time.LocalDateTime.getLong(Unknown Source)
at java.time.format.DateTimePrintContext.getValue(Unknown Source)
at java.time.format.DateTimeFormatterBuilder$InstantPrinterParser.format(Unknown Source)
at java.time.format.DateTimeFormatterBuilder$CompositePrinterParser.format(Unknown Source)
at java.time.format.DateTimeFormatter.formatTo(Unknown Source)
at java.time.format.DateTimeFormatter.format(Unknown Source)
at java.time.LocalDateTime.format(Unknown Source)
at test.test.main(test.java:51)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package test;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class test {
public static void main(String[] args) {//throws URISyntaxException {
LocalDateTime ldtn = LocalDateTime.now();
DateTimeFormatter fmtr = DateTimeFormatter.ISO_INSTANT;

String tmStr = ldtn.format(fmtr);
String debStr = "xyz"; // written for debug purpose
}
}

---------- END SOURCE ----------