--- a/src/java.base/share/classes/java/util/Scanner.java	Tue Dec 12 20:18:14 2017 -0800
+++ b/src/java.base/share/classes/java/util/Scanner.java	Wed Dec 13 12:43:38 2017 +0530
@@ -33,10 +33,13 @@
 import java.nio.file.Path;
 import java.nio.file.Files;
 import java.text.*;
+import java.text.spi.NumberFormatProvider;
 import java.util.function.Consumer;
 import java.util.regex.*;
 import java.util.stream.Stream;
 import java.util.stream.StreamSupport;
+import sun.util.locale.provider.LocaleProviderAdapter;
+import sun.util.locale.provider.ResourceBundleBasedAdapter;
 
 /**
  * A simple text scanner which can parse primitive types and strings using
@@ -1262,9 +1265,27 @@
 
         modCount++;
         this.locale = locale;
-        DecimalFormat df =
-            (DecimalFormat)NumberFormat.getNumberInstance(locale);
+
+        DecimalFormat df = null;
+        NumberFormat nf = NumberFormat.getNumberInstance(locale);
         DecimalFormatSymbols dfs = DecimalFormatSymbols.getInstance(locale);
+        if (nf instanceof DecimalFormat) {
+             df = (DecimalFormat) nf;
+        } else {
+
+            // In case where NumberFormat.getNumberInstance() returns
+            // other instance (non DecimalFormat) based on the provider
+            // used and java.text.spi.NumberFormatProvider implementations,
+            // DecimalFormat constructor is used to obtain the instance
+            LocaleProviderAdapter adapter = LocaleProviderAdapter
+                    .getAdapter(NumberFormatProvider.class, locale);
+            if (!(adapter instanceof ResourceBundleBasedAdapter)) {
+                adapter = LocaleProviderAdapter.getResourceBundleBased();
+            }
+            String[] all = adapter.getLocaleResources(locale)
+                    .getNumberPatterns();
+            df = new DecimalFormat(all[0], dfs);
+        }
 
         // These must be literalized to avoid collision with regex
         // metacharacters such as dot or parenthesis

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/util/Scanner/spi/UseLocaleWithProvider.java	Wed Dec 13 12:43:38 2017 +0530
@@ -0,0 +1,69 @@
+/*
+ * Copyright (c) 2017, 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 8190278
+ * @summary checks the Scanner.useLocale() with java.locale.providers=SPI,
+ *          COMPAT. It should not throw ClassCastException if any SPI is
+ *          used and NumberFormat.getInstance() does not return a
+ *          DecimalFormat object. Also, to test the behaviour of Scanner
+ *          while scanning numbers in the format of Scanner's locale.
+ * @modules jdk.localedata
+ * @library provider
+ * @build provider/module-info provider/test.NumberFormatProviderImpl
+ *        provider/test.NumberFormatImpl
+ * @run main/othervm -Djava.locale.providers=SPI,COMPAT UseLocaleWithProvider
+ */
+
+import java.util.Locale;
+import java.util.Scanner;
+
+public class UseLocaleWithProvider {
+
+    public static void main(String[] args) {
+
+        try {
+            testScannerUseLocale("-123.4", Locale.US, -123.4);
+            testScannerUseLocale("-123,45", new Locale("fi", "FI"), -123.45);
+            testScannerUseLocale("334,65", Locale.FRENCH, 334.65);
+            testScannerUseLocale("4.334,65", Locale.GERMAN, 4334.65);
+        } catch (ClassCastException ex) {
+            throw new RuntimeException("[FAILED: With" +
+                    " java.locale.providers=SPI,COMPAT, Scanner.useLocale()" +
+                    " shouldn't throw ClassCastException]");
+        }
+    }
+
+    private static void testScannerUseLocale(String number, Locale locale,
+                                             Number actual) {
+        Scanner sc = new Scanner(number).useLocale(locale);
+        if (!sc.hasNextFloat() || sc.nextFloat() != actual.floatValue()) {
+            throw new RuntimeException("[FAILED: With" +
+                    " java.locale.providers=SPI,COMPAT, Scanner" +
+                    ".hasNextFloat() or Scanner.nextFloat() is unable to" +
+                    " scan the given number: " + number + ", in the given" +
+                    " locale:" + locale + "]");
+        }
+    }
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/util/Scanner/spi/provider/module-info.java	Wed Dec 13 12:43:38 2017 +0530
@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2017, 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.
+*/
+module provider {
+    exports test;
+    provides java.text.spi.NumberFormatProvider with test.NumberFormatProviderImpl;
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/util/Scanner/spi/provider/test/NumberFormatImpl.java	Wed Dec 13 12:43:38 2017 +0530
@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+package test;
+
+import java.text.FieldPosition;
+import java.text.NumberFormat;
+import java.text.ParsePosition;
+
+public class NumberFormatImpl extends NumberFormat {
+
+    @Override
+    public StringBuffer format(double number, StringBuffer toAppendTo,
+                               FieldPosition pos) {
+        return null;
+    }
+
+    @Override
+    public StringBuffer format(long number, StringBuffer toAppendTo,
+                               FieldPosition pos) {
+        return null;
+    }
+
+    @Override
+    public Number parse(String source, ParsePosition parsePosition) {
+        return null;
+    }
+}
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/jdk/java/util/Scanner/spi/provider/test/NumberFormatProviderImpl.java	Wed Dec 13 12:43:38 2017 +0530
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2017, 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.
+ */
+package test;
+
+import java.text.NumberFormat;
+import java.text.spi.NumberFormatProvider;
+import java.util.Locale;
+
+public class NumberFormatProviderImpl extends NumberFormatProvider {
+
+    private static final Locale[] locales = {Locale.US, Locale.FRENCH,
+            Locale.GERMAN, new Locale("fi", "FI")};
+
+    @Override
+    public NumberFormat getCurrencyInstance(Locale locale) {
+        return null;
+    }
+
+    @Override
+    public NumberFormat getIntegerInstance(Locale locale) {
+        return null;
+    }
+
+    @Override
+    public NumberFormat getNumberInstance(Locale locale) {
+        return new NumberFormatImpl();
+    }
+
+    @Override
+    public NumberFormat getPercentInstance(Locale locale) {
+        return null;
+    }
+
+    @Override
+    public Locale[] getAvailableLocales() {
+        return locales;
+    }
+}
+