--- a/src/share/classes/java/util/Calendar.java	Mon Feb 02 21:38:19 2015 +0300
+++ b/src/share/classes/java/util/Calendar.java	Mon Mar 30 17:50:59 2015 +0900
@@ -2083,17 +2083,33 @@
             return null;
         }
 
+        String calendarType = getCalendarType();
+        int fieldValue = get(field);
         // the standalone and narrow styles are supported only through CalendarDataProviders.
-        if (isStandaloneStyle(style) || isNarrowStyle(style)) {
-            return CalendarDataUtility.retrieveFieldValueName(getCalendarType(),
-                                                              field, get(field),
-                                                              style, locale);
+        if (isStandaloneStyle(style) || isNarrowFormatStyle(style)) {
+            String val = CalendarDataUtility.retrieveFieldValueName(calendarType,
+                                                                    field, fieldValue,
+                                                                    style, locale);
+            // Perform fallback here to follow the CLDR rules
+            if (val == null) {
+                if (isNarrowFormatStyle(style)) {
+                    val = CalendarDataUtility.retrieveFieldValueName(calendarType,
+                                                                     field, fieldValue,
+                                                                     toStandaloneStyle(style),
+                                                                     locale);
+                } else if (isStandaloneStyle(style)) {
+                    val = CalendarDataUtility.retrieveFieldValueName(calendarType,
+                                                                     field, fieldValue,
+                                                                     getBaseStyle(style),
+                                                                     locale);
+                }
+            }
+            return val;
         }
 
         DateFormatSymbols symbols = DateFormatSymbols.getInstance(locale);
         String[] strings = getFieldStrings(field, style, symbols);
         if (strings != null) {
-            int fieldValue = get(field);
             if (fieldValue < strings.length) {
                 return strings[fieldValue];
             }
@@ -2155,10 +2171,26 @@
                                     ERA_MASK|MONTH_MASK|DAY_OF_WEEK_MASK|AM_PM_MASK)) {
             return null;
         }
-        if (style == ALL_STYLES || isStandaloneStyle(style)) {
-            return CalendarDataUtility.retrieveFieldValueNames(getCalendarType(), field, style, locale);
+
+        String calendarType = getCalendarType();
+        if (style == ALL_STYLES || isStandaloneStyle(style) || isNarrowFormatStyle(style)) {
+            Map<String, Integer> map;
+            map = CalendarDataUtility.retrieveFieldValueNames(calendarType, field, style, locale);
+
+            // Perform fallback here to follow the CLDR rules
+            if (map == null) {
+                if (isNarrowFormatStyle(style)) {
+                    map = CalendarDataUtility.retrieveFieldValueNames(calendarType, field,
+                                                                      toStandaloneStyle(style), locale);
+                } else if (style != ALL_STYLES) {
+                    map = CalendarDataUtility.retrieveFieldValueNames(calendarType, field,
+                                                                      getBaseStyle(style), locale);
+                }
+            }
+            return map;
         }
-        // SHORT, LONG, or NARROW
+
+        // SHORT or LONG
         return getDisplayNamesImpl(field, style, locale);
     }
 
@@ -2544,14 +2576,22 @@
         return style & ~STANDALONE_MASK;
     }
 
-    boolean isStandaloneStyle(int style) {
+    private int toStandaloneStyle(int style) {
+        return style | STANDALONE_MASK;
+    }
+
+    private boolean isStandaloneStyle(int style) {
         return (style & STANDALONE_MASK) != 0;
     }
 
-    boolean isNarrowStyle(int style) {
+    private boolean isNarrowStyle(int style) {
         return style == NARROW_FORMAT || style == NARROW_STANDALONE;
     }
 
+    private boolean isNarrowFormatStyle(int style) {
+        return style == NARROW_FORMAT;
+    }
+
     /**
      * Returns the pseudo-time-stamp for two fields, given their
      * individual pseudo-time-stamps.  If either of the fields

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/java/util/Calendar/Bug8075548.java	Mon Mar 30 17:50:59 2015 +0900
@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * @test
+ * @bug 8075548
+ * @summary Make sure that the format form of month names are produced when there are
+ *          no stand-alone ones available.
+ */
+
+import java.text.*;
+import java.util.*;
+import static java.util.Calendar.*;
+
+public class Bug8075548 {
+    static int errors = 0;
+
+    public static void main(String[] args) throws Throwable {
+        Date date = new SimpleDateFormat("yyyy-MM-dd", Locale.US).parse("2010-09-15");
+        String[][] FORMAT_PAIRS = {
+            { "LLLL", "MMMM" },
+            { "LLL",  "MMM" }
+        };
+        Locale[] LOCALES = {
+            Locale.ENGLISH, Locale.FRENCH, Locale.GERMAN, Locale.JAPANESE
+        };
+
+        for (Locale locale : LOCALES) {
+            for (String[] formats : FORMAT_PAIRS) {
+                String el = new SimpleDateFormat(formats[0], locale).format(date);
+                String em = new SimpleDateFormat(formats[1], locale).format(date);
+                if (!el.equals(em)) {
+                    errors++;
+                    System.err.println(locale + ": " +
+                                       formats[0] + " -> " + el + ", " +
+                                       formats[1] + " -> " + em);
+                }
+            }
+        }
+
+        // Test Calendar.getDisplayName() and .getDisplayNames().
+        for (Locale locale : LOCALES) {
+            testDisplayNames(locale, LONG_FORMAT, LONG_STANDALONE);
+            testDisplayNames(locale, SHORT_FORMAT, SHORT_STANDALONE);
+            testDisplayNames(locale, NARROW_FORMAT, NARROW_STANDALONE);
+        }
+
+        if (errors > 0) {
+            throw new RuntimeException("Failed");
+        }
+    }
+
+    private static void testDisplayNames(Locale locale, int formatStyle, int standaloneStyle) {
+        Map<String, Integer> map = new HashMap<>();
+        for (int month = JANUARY; month <= DECEMBER; month++) {
+            Calendar cal = new GregorianCalendar(2015, month, 1);
+            String format = cal.getDisplayName(MONTH, formatStyle, locale);
+            String standalone = cal.getDisplayName(MONTH, standaloneStyle, locale);
+            if (!format.equals(standalone)) {
+                System.err.println("Calendar.getDisplayName: " + (month+1) +
+                                   ", locale=" + locale +
+                                   ", format=" + format + ", standalone=" + standalone);
+                errors++;
+            }
+            if (standalone != null) {
+                map.put(standalone, month);
+            }
+        }
+        if (formatStyle == NARROW_FORMAT) {
+            // Narrow styles don't support unique names.
+            // (e.g., "J" for JANUARY, JUNE, and JULY)
+            return;
+        }
+        Calendar cal = new GregorianCalendar(2015, JANUARY, 1);
+        Map<String, Integer> mapStandalone = cal.getDisplayNames(MONTH, standaloneStyle, locale);
+        if (!map.equals(mapStandalone)) {
+            System.err.printf("Calendar.getDisplayNames: locale=%s%n    map=%s%n    mapStandalone=%s%n",
+                              locale, map, mapStandalone);
+            errors++;
+        }
+        Map<String, Integer> mapAll = cal.getDisplayNames(MONTH, ALL_STYLES, locale);
+        if (!mapAll.entrySet().containsAll(map.entrySet())) {
+            System.err.printf("Calendar.getDisplayNames: locale=%s%n    map=%s%n    mapAll=%s%n",
+                              locale, map, mapAll);
+            errors++;
+        }
+    }
+}

--- a/test/java/util/Calendar/NarrowNamesTest.java	Mon Feb 02 21:38:19 2015 +0300
+++ b/test/java/util/Calendar/NarrowNamesTest.java	Mon Mar 30 17:50:59 2015 +0900
@@ -86,7 +86,19 @@
                 "\u6728",
                 "\u91d1",
                 "\u571f");
-        testMap(THTH, MONTH, NARROW_FORMAT); // expect null
+        testMap(THTH, MONTH, NARROW_FORMAT,
+                "\u0e21.\u0e04.",
+                "\u0e01.\u0e1e.",
+                "\u0e21\u0e35.\u0e04.",
+                "\u0e40\u0e21.\u0e22.",
+                "\u0e1e.\u0e04.",
+                "\u0e21\u0e34.\u0e22",  // no last dot
+                "\u0e01.\u0e04.",
+                "\u0e2a.\u0e04.",
+                "\u0e01.\u0e22.",
+                "\u0e15.\u0e04.",
+                "\u0e1e.\u0e22.",
+                "\u0e18.\u0e04.");
         testMap(THTH, MONTH, NARROW_STANDALONE,
                 "\u0e21.\u0e04.",
                 "\u0e01.\u0e1e.",
@@ -146,7 +158,7 @@
         Calendar cal = Calendar.getInstance(locale);
         Map<String, Integer> got = cal.getDisplayNames(field, style, locale);
         if (!(expectedMap == null && got == null)
-            && !expectedMap.equals(got)) {
+            && !(expectedMap != null && expectedMap.equals(got))) {
             System.err.printf("testMap: locale=%s, field=%d, style=%d, expected=%s, got=%s%n",
                               locale, field, style, expectedMap, got);
             errors++;