FULL PRODUCT VERSION :
java version "1.8.0_161"
Java(TM) SE Runtime Environment (build 1.8.0_161-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.161-b12, mixed mode)


ADDITIONAL OS VERSION INFORMATION :
Linux laptop 4.4.0-112-generic #135~14.04.1-Ubuntu SMP Tue Jan 23 20:41:48 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
The unit test below fails with the above java version, but passes with this version:

openjdk version "1.8.0_141"
OpenJDK Runtime Environment (build 1.8.0_141-8u141-b15-3~14.04-b15)
OpenJDK 64-Bit Server VM (build 25.141-b15, mixed mode)

The problem might be in the XMLGregorianCalendar.toGregorianCalendar() call or in GregorianCalendar.getTimeInMillis() and I don't know which of the two versions of the JDK is at fault, but it should be relatively easy to investigate further.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run unit test.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Should pass.
ACTUAL -
Fails.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
CalendarHelperTest.testFromXmlGregorianCalendar:49 expected:<1399551732104> but was:<1399558812104>

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
@Test
    public void testFromXmlGregorianCalendar() throws DatatypeConfigurationException {
        XMLGregorianCalendar cal =
                DatatypeFactory.newInstance().newXMLGregorianCalendar();
        // UTC + 2 = CET daylight savings
        cal.setTimezone(2);
        
        cal.setYear(2014);
        cal.setMonth(5);
        cal.setDay(8);
        
        cal.setHour(14);
        cal.setMinute(22);
        cal.setSecond(12);
        cal.setMillisecond(104);
        
        long expected = 1399551732104L;
        long actual = cal.toGregorianCalendar().getTimeInMillis();
        assertEquals(expected, actual);
    }

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

CUSTOMER SUBMITTED WORKAROUND :
use different JDK