--- a/jdk/src/java.base/share/classes/sun/util/calendar/ZoneInfo.java	Wed Aug 24 13:32:00 2016 +0800
+++ b/jdk/src/java.base/share/classes/sun/util/calendar/ZoneInfo.java	Wed Aug 24 13:54:17 2016 +0200
@@ -27,15 +27,8 @@
 
 import java.io.IOException;
 import java.io.ObjectInputStream;
-import java.lang.ref.SoftReference;
-import java.security.AccessController;
-import java.util.ArrayList;
-import java.util.Arrays;
 import java.util.Date;
-import java.util.List;
-import java.util.Locale;
 import java.util.Map;
-import java.util.Set;
 import java.util.SimpleTimeZone;
 import java.util.TimeZone;
 
@@ -80,8 +73,6 @@
     private static final long ABBR_MASK = 0xf00L;
     private static final int TRANSITION_NSHIFT = 12;
 
-    private static final CalendarSystem gcal = CalendarSystem.getGregorianCalendar();
-
     /**
      * The raw GMT offset in milliseconds between this zone and GMT.
      * Negative offsets are to the west of Greenwich.  To obtain local
@@ -379,6 +370,7 @@
             throw new IllegalArgumentException();
         }
 
+        Gregorian gcal = CalendarSystem.getGregorianCalendar();
         CalendarDate date = gcal.newCalendarDate(null);
         date.setDate(year, month + 1, day);
         if (gcal.validate(date) == false) {