--- old/test/jdk/java/text/Format/CompactNumberFormat/TestCompactNumber.java	2019-03-06 14:52:30.655000000 +0530
+++ new/test/jdk/java/text/Format/CompactNumberFormat/TestCompactNumber.java	2019-03-06 14:52:30.139000000 +0530
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2018, 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
@@ -22,7 +22,7 @@
  */
 /*
  * @test
- * @bug 8177552
+ * @bug 8177552 8217721
  * @summary Checks the functioning of compact number format
  * @modules jdk.localedata
  * @run testng/othervm TestCompactNumber
@@ -528,6 +528,11 @@
                 .getCompactNumberInstance(l, NumberFormat.Style.LONG).format(10000));
     }
 
+    @Test(expectedExceptions = IllegalArgumentException.class)
+    public void testFormatWithNullParam() {
+        FORMAT_EN_US_SHORT.format(null);
+    }
+
     @Test(dataProvider = "format")
     public void testFormat(NumberFormat cnf, Object number,
             String expected) {