--- a/src/java.base/share/native/libjava/System.c	Fri Mar 23 16:50:02 2018 +0100
+++ b/src/java.base/share/native/libjava/System.c	Fri Mar 23 11:53:11 2018 -0400
@@ -244,21 +244,8 @@
     PUTPROP(props, "line.separator", sprops->line_separator);
 
     /*
-     *  user.language
-     *  user.script, user.country, user.variant (if user's environment specifies them)
-     *  file.encoding
+     * file encoding for stdout and stderr
      */
-    PUTPROP(props, "user.language", sprops->language);
-    if (sprops->script) {
-        PUTPROP(props, "user.script", sprops->script);
-    }
-    if (sprops->country) {
-        PUTPROP(props, "user.country", sprops->country);
-    }
-    if (sprops->variant) {
-        PUTPROP(props, "user.variant", sprops->variant);
-    }
-    PUTPROP(props, "file.encoding", sprops->encoding);
     if (sprops->sun_stdout_encoding != NULL) {
         PUTPROP(props, "sun.stdout.encoding", sprops->sun_stdout_encoding);
     }
@@ -314,7 +301,7 @@
 #endif
 
     /* !!! DO NOT call PUTPROP_ForPlatformNString before this line !!!
-     * !!! I18n properties have not been set up yet !!!
+     * !!! The platform native encoding for strings has not been set up yet !!!
      */
     InitializeEncoding(env, sprops->sun_jnu_encoding);
 
@@ -379,17 +366,6 @@
         PUTPROP(props, "sun.desktop", sprops->desktop);
     }
 
-    /*
-     * unset "user.language", "user.script", "user.country", and "user.variant"
-     * in order to tell whether the command line option "-DXXXX=YYYY" is
-     * specified or not.  They will be reset in fillI18nProps() below.
-     */
-    REMOVEPROP(props, "user.language");
-    REMOVEPROP(props, "user.script");
-    REMOVEPROP(props, "user.country");
-    REMOVEPROP(props, "user.variant");
-    REMOVEPROP(props, "file.encoding");
-
     ret = JVM_InitProperties(env, props);
 
     /* reconstruct i18n related properties */

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/util/Locale/LocaleCmdOverrides.java	Fri Mar 23 11:53:11 2018 -0400
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2018, 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.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * 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.
+ */
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.lang.management.ManagementFactory;
+import java.lang.management.RuntimeMXBean;
+import java.util.List;
+
+/*
+ * @test
+ * @modules java.management
+ * @summary verify that overriddes on the command line affect *.display and *.format properties
+ * @run main/othervm
+ *          LocaleCmdOverrides
+ * @run main/othervm -Duser.language=XX
+ *                   -Duser.country=X1
+ *                   -Duser.script=X2
+ *                   -Duser.variant=X3
+ *          LocaleCmdOverrides
+ * @run main/othervm -Duser.language=XX -Duser.language.display=YY
+ *                   -Duser.country=X1 -Duser.country.display=Y1
+ *                   -Duser.script=X2 -Duser.script.display=Y2
+ *                   -Duser.variant=X3 -Duser.variant.display=Y3
+ *          LocaleCmdOverrides
+ * @run main/othervm -Duser.language=XX -Duser.language.display=YY -Duser.language.format=ZZ
+ *                   -Duser.country=X1 -Duser.country.display=Y1 -Duser.country.format=Z1
+ *                   -Duser.script=X2 -Duser.script.display=Y2 -Duser.script.format=Z2
+ *                   -Duser.variant=X3 -Duser.variant.display=Y3 -Duser.variant.format=Z3
+ *          LocaleCmdOverrides
+ * @run main/othervm -Duser.language=XX -Duser.language.format=ZZ
+ *                   -Duser.country=X1 -Duser.country.format=Z1
+ *                   -Duser.script=X2 -Duser.script.format=Z2
+ *                   -Duser.variant=X3 -Duser.variant.format=Z3
+ *          LocaleCmdOverrides
+ * @run main/othervm -Duser.language=XX -Duser.language.display=XX
+ *                   -Duser.country=X1 -Duser.country.display=X1
+ *                   -Duser.script=X2 -Duser.script.display=X2
+ *                   -Duser.variant=X3 -Duser.variant.display=X3
+ *          LocaleCmdOverrides
+ * @run main/othervm -Duser.language=XX -Duser.language.display=XX -Duser.language.format=XX
+ *                   -Duser.country=X1 -Duser.country.display=X1 -Duser.country.format=X1
+ *                   -Duser.script=X2 -Duser.script.display=X2 -Duser.script.format=X2
+ *                   -Duser.variant=X3 -Duser.variant.display=X3 -Duser.variant.format=X3
+ *          LocaleCmdOverrides
+ * @run main/othervm -Duser.language=XX -Duser.language.format=X1
+ *                   -Duser.country.format=X1
+ *                   -Duser.script.format=X2
+ *                   -Duser.variant.format=X3
+ *          LocaleCmdOverrides
+ */
+public class LocaleCmdOverrides {
+
+    // Language, country, script, variant
+
+    public static void main(String[] args) {
+        Map<String, String> props = commandLineDefines();
+        System.out.printf("props: %s%n", props);
+        test("user.language", props);
+        test("user.country", props);
+        test("user.script", props);
+        test("user.variant", props);
+    }
+
+    /*
+     * Check each of the properties for a given basename.
+     */
+    static void test(String baseName, Map<String, String> args) {
+        validateArg(baseName,"",  args);
+        validateArg(baseName,".display", args);
+        validateArg(baseName,".format", args);
+    }
+
+    // If an argument is -D defined, the corresponding property must be equal
+    static void validateArg(String name, String ext, Map<String, String> args) {
+        String extName = name.concat(ext);
+        String arg = args.get(extName);
+        String prop = System.getProperty(extName);
+        if (arg == null && prop == null) {
+            System.out.printf("No values for %s%n", extName);
+        } else {
+            System.out.printf("validateArg %s: arg: %s, prop: %s%n", extName, arg, prop);
+        }
+
+        if (arg != null) {
+            if (!Objects.equals(arg, prop)) {
+                throw new RuntimeException(extName + ": -D value should match property: "
+                        + arg + " != " + prop);
+            }
+        } else if (prop != null) {
+            // no command line arg for extName and some value for prop
+            // Check that if a property is not overridden then it is not equal to the base
+            if (ext != null && !ext.isEmpty()) {
+                String value = System.getProperty(name);
+                if (Objects.equals(value, prop)) {
+                    throw new RuntimeException(extName + " property should not be equals to "
+                            + name + " property: " + prop);
+                }
+            }
+        }
+    }
+
+    /**
+     * Extract the -D arguments from the command line and return a map of key, value.
+     * @return a map of key, values defined by -D on the command line.
+     */
+    static HashMap<String, String> commandLineDefines() {
+        HashMap<String, String> props = new HashMap<>();
+        RuntimeMXBean runtime = ManagementFactory.getRuntimeMXBean();
+        List<String> args = runtime.getInputArguments();
+        System.out.printf("args: %s%n", args);
+        for (String arg : args) {
+            if (arg.startsWith("-Duser.")) {
+                String[] kv = arg.substring(2).split("=");
+                switch (kv.length) {
+                    case 1:
+                        props.put(kv[0], "");
+                        break;
+                    case 2:
+                        props.put(kv[0], kv[1]);
+                        break;
+                    default:
+                        throw new IllegalArgumentException("Illegal property syntax: " + arg);
+                }
+            }
+        }
+        return props;
+    }
+}