src/jdk/nashorn/internal/objects/NativeString.java

*** 36,45 ****
--- 36,46 ----
  import java.text.Collator;
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.LinkedList;
  import java.util.List;
+ import java.util.Locale;
  import jdk.internal.dynalink.CallSiteDescriptor;
  import jdk.internal.dynalink.linker.GuardedInvocation;
  import jdk.internal.dynalink.linker.LinkRequest;
  import jdk.nashorn.internal.lookup.MethodHandleFactory;
  import jdk.nashorn.internal.objects.annotations.Attribute;
*** 995,1005 ****
       * @param self self reference
       * @return string to lower case
       */
      @Function(attributes = Attribute.NOT_ENUMERABLE)
      public static Object toLowerCase(final Object self) {
!         return checkObjectToString(self).toLowerCase();
      }
  
      /**
       * ECMA 15.5.4.17 String.prototype.toLocaleLowerCase ( )
       * @param self self reference
--- 996,1006 ----
       * @param self self reference
       * @return string to lower case
       */
      @Function(attributes = Attribute.NOT_ENUMERABLE)
      public static Object toLowerCase(final Object self) {
!         return checkObjectToString(self).toLowerCase(Locale.ROOT);
      }
  
      /**
       * ECMA 15.5.4.17 String.prototype.toLocaleLowerCase ( )
       * @param self self reference
*** 1015,1025 ****
       * @param self self reference
       * @return string to upper case
       */
      @Function(attributes = Attribute.NOT_ENUMERABLE)
      public static Object toUpperCase(final Object self) {
!         return checkObjectToString(self).toUpperCase();
      }
  
      /**
       * ECMA 15.5.4.19 String.prototype.toLocaleUpperCase ( )
       * @param self self reference
--- 1016,1026 ----
       * @param self self reference
       * @return string to upper case
       */
      @Function(attributes = Attribute.NOT_ENUMERABLE)
      public static Object toUpperCase(final Object self) {
!         return checkObjectToString(self).toUpperCase(Locale.ROOT);
      }
  
      /**
       * ECMA 15.5.4.19 String.prototype.toLocaleUpperCase ( )
       * @param self self reference