--- old/src/java.base/share/classes/java/text/SimpleDateFormat.java	2019-01-17 08:32:08.700762496 -0800
+++ new/src/java.base/share/classes/java/text/SimpleDateFormat.java	2019-01-17 08:32:07.317733573 -0800
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2019, 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
@@ -533,6 +533,8 @@
 
     private static final int MILLIS_PER_MINUTE = 60 * 1000;
 
+    private static final int STANDALONE_MASK = 0x8000; // Calendar.STANDALONE_MASK
+
     // For time zones that have no names, use strings GMT+minutes and
     // GMT-minutes. For instance, in France the time zone is GMT+60.
     private static final String GMT = "GMT";
@@ -1189,7 +1191,7 @@
             }
             break;
 
-        case PATTERN_MONTH:            // 'M' (context seinsive)
+        case PATTERN_MONTH:            // 'M' (context sensitive)
             if (useDateFormatSymbols) {
                 String[] months;
                 if (count >= 4) {
@@ -1203,7 +1205,7 @@
                 if (count < 3) {
                     current = null;
                 } else if (forceStandaloneForm) {
-                    current = calendar.getDisplayName(field, style | 0x8000, locale);
+                    current = calendar.getDisplayName(field, style | STANDALONE_MASK, locale);
                     if (current == null) {
                         current = calendar.getDisplayName(field, style, locale);
                     }
@@ -1227,7 +1229,7 @@
                 }
             } else {
                 if (count >= 3) {
-                    current = calendar.getDisplayName(field, style | 0x8000, locale);
+                    current = calendar.getDisplayName(field, style | STANDALONE_MASK, locale);
                 }
             }
             if (current == null) {
@@ -2033,7 +2035,7 @@
                         return index;
                     }
                 } else {
-                    Map<String, Integer> map = getDisplayNamesMap(field, locale);
+                    Map<String, Integer> map = getDisplayContextNamesMap(field, locale);
                     if ((index = matchString(text, start, field, map, calb)) > 0) {
                         return index;
                     }
@@ -2449,6 +2451,19 @@
         return map;
     }
 
+    // for 'M' pattern only
+    private Map<String, Integer> getDisplayContextNamesMap(int field, Locale locale) {
+        Map<String, Integer> map = calendar.getDisplayNames(field,
+            Calendar.SHORT_FORMAT | (forceStandaloneForm ? STANDALONE_MASK : 0), locale);
+        // Get LONG styles
+        Map<String, Integer> m = calendar.getDisplayNames(field,
+            Calendar.LONG_FORMAT | (forceStandaloneForm ? STANDALONE_MASK : 0), locale);
+        if (m != null) {
+            map.putAll(m);
+        }
+        return map;
+    }
+
     /**
      * After reading an object from the input stream, the format
      * pattern in the object is verified.