FULL PRODUCT VERSION :
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
See bug JDK-8145166; this is a different report but related. If a duration is negative, the minus sign is placed in the incorrect place. An example output is "PT-1S" while the proper output should be "-PT1S".

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Create a negative duration, call toString. See source example below.


ERROR MESSAGES/STACK TRACES THAT OCCUR :
N/A, however if using JAXB to marshal a Duration to XML, will generate an exception when validating the format.

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.time.Duration;
import org.junit.Assert;
import org.junit.Test;

public class XmlTest {

@Test
public void test() throws InterruptedException{
Duration d = Duration.ofSeconds(-1);
Assert.assertTrue(d.isNegative()); //Passes
String actual = d.toString();
String expected = "-PT1S";
System.out.println(actual);
Assert.assertEquals(expected, actual); //Fails, java bug
}

}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
public static String printDuration(Duration value) {
if (value == null)
return null;
String str = value.toString();
/**
* Bug in Java duration printing, it' doing negative sign in wrong place, e.g. "PT-0.25S". It should be "-PT0.25S"
*/
if (value.isNegative()) {
str = str.replace("-", "");
str = "-" + str;
}
return str;
}