FULL PRODUCT VERSION :
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
ubuntu 14.04 LTS 64 bit

A DESCRIPTION OF THE PROBLEM :
I am trying to compare two ZonedDateTimes obtained from ZonedDateTime.now() using ZonedDateTime's compareTo function. When get two two ZonedDateTimes in quick succession, and compare them, compare to returns a value other than 1, 0, or -1.

Here is the sample code I ran.

public class Main {

    private static final ZoneId ET = ZoneId.of("America/New_York");

    public static void main(String[] args) {
        ZonedDateTime ts1 = ZonedDateTime.now(ET);
        ZonedDateTime ts2 = ZonedDateTime.now(ET);
        System.out.println(ts1);
        System.out.println(ts2);
        System.out.println(ts1.compareTo(ts2));
        System.out.println(ts1.equals(ts2));
    }
}

The output I receive is

2015-05-08T13:13:04.698-04:00[America/New_York]
2015-05-08T13:13:04.789-04:00[America/New_York]
-91000000
false

If I add at least a second to the to one of the ZonedDateTimes, the comparison works as seen here

public class Main {

    private static final ZoneId ET = ZoneId.of("America/New_York");

    public static void main(String[] args) {
        ZonedDateTime ts1 = ZonedDateTime.now(ET);
        ZonedDateTime ts2 = ZonedDateTime.now(ET).plusSeconds(1);
        System.out.println(ts1);
        System.out.println(ts2);
        System.out.println(ts1.compareTo(ts2));
        System.out.println(ts1.equals(ts2));
    }
}

with output

2015-05-08T13:15:44.945-04:00[America/New_York]
2015-05-08T13:15:46.051-04:00[America/New_York]
-1
false

Adding nanos will also cause the return value to be correct, but not always.



ADDITIONAL REGRESSION INFORMATION:
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
You can run this code:

import java.time.ZoneId;
import java.time.ZonedDateTime;

public class Main {

    private static final ZoneId ET = ZoneId.of("America/New_York");

    public static void main(String[] args) {
        ZonedDateTime ts1 = ZonedDateTime.now(ET);
        ZonedDateTime ts2 = ZonedDateTime.now(ET);
        System.out.println(ts1);
        System.out.println(ts2);
        System.out.println(ts1.compareTo(ts2));
        System.out.println(ts1.equals(ts2));
    }
}

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The third System.out.println should print -1.
ACTUAL -
The third System.out.println prints a number that is not -1, 1, or 0.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.time.ZoneId;
import java.time.ZonedDateTime;

public class Main {

    private static final ZoneId ET = ZoneId.of("America/New_York");

    public static void main(String[] args) {
        ZonedDateTime ts1 = ZonedDateTime.now(ET);
        ZonedDateTime ts2 = ZonedDateTime.now(ET).p;
        System.out.println(ts1);
        System.out.println(ts2);
        System.out.println(ts1.compareTo(ts2));
        System.out.println(ts1.equals(ts2));
    }
}

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

CUSTOMER SUBMITTED WORKAROUND :
I convert the ZonedDateTimes to LocalDateTimes and compare them:

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;

public class Main {

    private static final ZoneId ET = ZoneId.of("America/New_York");

    public static void main(String[] args) {
        ZonedDateTime ts1 = ZonedDateTime.now(ET);
        ZonedDateTime ts2 = ZonedDateTime.now(ET);

        LocalDateTime ts3 = ts1.toLocalDateTime();
        LocalDateTime ts4 = ts2.toLocalDateTime();

        System.out.println(ts1);
        System.out.println(ts2);
        System.out.println(ts1.compareTo(ts2));
        System.out.println(ts1.equals(ts2));

        System.out.println(ts3);
        System.out.println(ts4);
        System.out.println(ts3.compareTo(ts4));

    }
}