--- old/src/share/classes/java/text/SimpleDateFormat.java	2015-11-16 18:29:52.248543100 +0530
+++ new/src/share/classes/java/text/SimpleDateFormat.java	2015-11-16 18:29:51.526470900 +0530
@@ -1631,8 +1631,8 @@
     }
 
     private int matchZoneString(String text, int start, String[] zoneNames) {
-        for (int i = 1; i <= 4; ++i) {
-            // Checking long and short zones [1 & 2],
+        for (int i = 0; i <= 4; ++i) {
+            // Checking main zone[0], long and short zones [1 & 2],
             // and long and short daylight [3 & 4].
             String zoneName = zoneNames[i];
             if (text.regionMatches(true, start,
@@ -1657,6 +1657,13 @@
     /**
      * find time zone 'text' matched zoneStrings and set to internal
      * calendar.
+     * To fix the Bug 8141243, this method is slightly altered and works like this:
+     * If nameIndex is matching DST in zoneNames(i.e.nameIndex>2), then tz is assigned to the first timezone (at index 0),
+     * otherwise "tz" is assigned to the timzone at nameIndex in the zoneNames.This will make sure that,
+     * if any of the abbreviated timezones(like UTC,IST,PST,etc...) which is also part of the main timezone groups is set properly. 
+     * Also, there is a special condition added for the other virtual timezones which are not part of the main timezones
+     * like AKST,ACST,AEST,WAT,etc.(i.e. "TimeZone.getTimeZone(zoneNames)" always returns "GMT" for those timezones),
+     * in which the timezone "tz" is always set to the first timezone in the group(at index 0).
      */
     private int subParseZoneString(String text, int start, CalendarBuilder calb) {
         boolean useSameName = false; // true if standard and daylight time use the same abbreviation.
@@ -1669,26 +1676,36 @@
         TimeZone tz = null;
         String[][] zoneStrings = formatData.getZoneStringsWrapper();
         String[] zoneNames = null;
-        int nameIndex = 0;
+        int nameIndex = -1;
         if (zoneIndex != -1) {
             zoneNames = zoneStrings[zoneIndex];
-            if ((nameIndex = matchZoneString(text, start, zoneNames)) > 0) {
-                if (nameIndex <= 2) {
+            if ((nameIndex = matchZoneString(text, start, zoneNames)) >= 0) {
+                if (nameIndex > 0 && nameIndex < 3) {
                     // Check if the standard name (abbr) and the daylight name are the same.
                     useSameName = zoneNames[nameIndex].equalsIgnoreCase(zoneNames[nameIndex + 2]);
                 }
-                tz = TimeZone.getTimeZone(zoneNames[0]);
+                int index = (nameIndex <= 2) ? nameIndex : 0;
+                tz = TimeZone.getTimeZone(zoneNames[index]);
+                if (!("GMT".equals(currentTimeZone.getID()) || "GMT".equals(zoneNames[index]))
+                        && "GMT".equals(tz.getID())) {
+                    tz = TimeZone.getTimeZone(zoneNames[0]);
+                }
             }
         }
         if (tz == null) {
             zoneIndex = formatData.getZoneIndex(TimeZone.getDefault().getID());
             if (zoneIndex != -1) {
                 zoneNames = zoneStrings[zoneIndex];
-                if ((nameIndex = matchZoneString(text, start, zoneNames)) > 0) {
-                    if (nameIndex <= 2) {
+                if ((nameIndex = matchZoneString(text, start, zoneNames)) >= 0) {
+                    if (nameIndex > 0 && nameIndex < 3) {
                         useSameName = zoneNames[nameIndex].equalsIgnoreCase(zoneNames[nameIndex + 2]);
                     }
-                    tz = TimeZone.getTimeZone(zoneNames[0]);
+                    int index = (nameIndex <= 2) ? nameIndex : 0;
+                    tz = TimeZone.getTimeZone(zoneNames[index]);
+                    if (!("GMT".equals(TimeZone.getDefault().getID()) || "GMT".equals(zoneNames[index]))
+                            && "GMT".equals(tz.getID())) {
+                        tz = TimeZone.getTimeZone(zoneNames[0]);
+                    }
                 }
             }
         }
@@ -1697,11 +1714,15 @@
             int len = zoneStrings.length;
             for (int i = 0; i < len; i++) {
                 zoneNames = zoneStrings[i];
-                if ((nameIndex = matchZoneString(text, start, zoneNames)) > 0) {
-                    if (nameIndex <= 2) {
+                if ((nameIndex = matchZoneString(text, start, zoneNames)) >= 0) {
+                    if (nameIndex > 0 && nameIndex < 3) {
                         useSameName = zoneNames[nameIndex].equalsIgnoreCase(zoneNames[nameIndex + 2]);
                     }
-                    tz = TimeZone.getTimeZone(zoneNames[0]);
+                    int index = (nameIndex <= 2) ? nameIndex : 0;
+                    tz = TimeZone.getTimeZone(zoneNames[index]);
+                    if (!("GMT".equals(zoneNames[0]) || "GMT".equals(zoneNames[index])) && "GMT".equals(tz.getID())) {
+                        tz = TimeZone.getTimeZone(zoneNames[0]);
+                    }
                     break;
                 }
             }
@@ -2075,6 +2096,8 @@
                                 if (sign == 0) {    /* "GMT" without offset */
                                     calb.set(Calendar.ZONE_OFFSET, 0)
                                         .set(Calendar.DST_OFFSET, 0);
+                                    // set the timezone "GMT" to internal calendar, since it will not be set later.
+                                    setTimeZone(TimeZone.getTimeZone("GMT"));
                                     return pos.index;
                                 }