A DESCRIPTION OF THE PROBLEM :
worked with jdk1.8.0_192, jdk-10.0.2, jdk-13.0.1
no more works with jdk-13.0.1, jdk-19.0.2
(see Bug ID: JDK-2013829 and JDK-4028061)

REGRESSION : Last worked in version 8u361

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
compile and runs source example with different versions

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
e.g. from jdk1.8.0_192
de_DE sun.util.calendar.ZoneInfo[id="Europe/Berlin",offset=3600000,dstSavings=3600000,useDaylight=true,transitions=143,lastRule=java.util.SimpleTimeZone[id=Europe/Berlin,offset=3600000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=3600000,startTimeMo
de=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTime=3600000,endTimeMode=2]]

Fri Dec 31 00:00:00 CET 1999

ACTUAL -
from jdk-19.0.2
de_DE sun.util.calendar.ZoneInfo[id="Europe/Berlin",offset=3600000,dstSavings=3600000,useDaylight=true,transitions=143,lastRule=java.util.SimpleTimeZone[id=Europe/Berlin,offset=3600000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=3600000,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTime=3600000,endTimeMode=2]]

Exception in thread "main" java.text.ParseException: Unparseable date: "1999-Dez-31"
        at java.base/java.text.DateFormat.parse(DateFormat.java:399)
        at DateFormatParseBug.main(DateFormatParseBug.java:10)



---------- BEGIN SOURCE ----------
import java.text.*;
import java.util.*;

class DateFormatParseBug
{
   public static void main( String... args ) throws ParseException
   {
      SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-MMM-dd" );
      System.out.println( Locale.getDefault() + " " + sdf.getTimeZone() );
      System.out.println( sdf.parse( "1999-Dez-31" ) );
   // System.out.println( sdf.parse( "1999-Dec-31" ) );
   }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
unknown

FREQUENCY : always