6986612: pit jdk7 b112: java.util.Locale getDisplayVariant() sqe test...

6986612: pit jdk7 b112: java.util.Locale getDisplayVariant() sqe test getDisplayVariantTests.java fails
Reviewed-by: dougfelt
Contributed-by: NYoshito Umaoka <y.umaoka@gmail.com>

src/share/classes/java/util/Locale.java

@@ -569,6 +569,9 @@ public final class Locale implements Cloneable, Serializable {
      * @exception NullPointerException thrown if any argument is null.
      */
     public Locale(String language, String country, String variant) {
+        if (language== null || country == null || variant == null) {
+            throw new NullPointerException();
+        }
         _baseLocale = BaseLocale.getInstance(convertOldISOCodes(language), "", country, variant);
         _extensions = getCompatibilityExtensions(language, "", country, variant);
     }

src/share/classes/sun/util/locale/BaseLocale.java

@@ -64,12 +64,14 @@ public final class BaseLocale {
 
     public static BaseLocale getInstance(String language, String script, String region, String variant) {
         // JDK uses deprecated ISO639.1 language codes for he, yi and id
-        if (AsciiUtil.caseIgnoreMatch(language, "he")) {
-            language = "iw";
-        } else if (AsciiUtil.caseIgnoreMatch(language, "yi")) {
-            language = "ji";
-        } else if (AsciiUtil.caseIgnoreMatch(language, "id")) {
-            language = "in";
+        if (language != null) {
+            if (AsciiUtil.caseIgnoreMatch(language, "he")) {
+                language = "iw";
+            } else if (AsciiUtil.caseIgnoreMatch(language, "yi")) {
+                language = "ji";
+            } else if (AsciiUtil.caseIgnoreMatch(language, "id")) {
+                language = "in";
+            }
         }
 
         Key key = new Key(language, script, region, variant);