--- a/jdk/src/java.base/share/classes/java/lang/ClassLoader.java	Fri Sep 09 16:24:24 2016 -0400
+++ b/jdk/src/java.base/share/classes/java/lang/ClassLoader.java	Fri Sep 09 13:44:48 2016 -0700
@@ -1922,9 +1922,14 @@
      * @return The {@code Package} of the given name defined by this class loader,
      *         or {@code null} if not found
      *
+     * @throws  NullPointerException
+     *          if {@code name} is {@code null}.
+     *
      * @since  9
      */
     public final Package getDefinedPackage(String name) {
+        Objects.requireNonNull(name, "name cannot be null");
+
         NamedPackage p = packages.get(name);
         if (p == null)
             return null;
@@ -1962,6 +1967,9 @@
      * @return The {@code Package} corresponding to the given name defined by
      *         this class loader or its ancestors, or {@code null} if not found.
      *
+     * @throws  NullPointerException
+     *          if {@code name} is {@code null}.
+     *
      * @deprecated
      * If multiple class loaders delegate to each other and define classes
      * with the same package name, and one such loader relies on the lookup

--- a/jdk/src/java.base/share/classes/java/lang/Package.java	Fri Sep 09 16:24:24 2016 -0400
+++ b/jdk/src/java.base/share/classes/java/lang/Package.java	Fri Sep 09 13:44:48 2016 -0700
@@ -317,6 +317,9 @@
      * @return The {@code Package} of the given name defined by the caller's
      *         class loader or its ancestors, or {@code null} if not found.
      *
+     * @throws NullPointerException
+     *         if {@code name} is {@code null}.
+     *
      * @deprecated
      * If multiple class loaders delegate to each other and define classes
      * with the same package name, and one such loader relies on the lookup

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/java/lang/ClassLoader/GetDefinedPackage.java	Fri Sep 09 13:44:48 2016 -0700
@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2016, 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 8165346
+ * @summary Basic test for ClassLoader::getDefinedPackage
+ */
+
+public class GetDefinedPackage {
+    public static void main(String... args) {
+        TestClassLoader loader = new TestClassLoader();
+        Package pkg = loader.getDefinedPackage(TestClassLoader.PKG_NAME);
+        if (pkg == null) {
+            throw new RuntimeException("package foo not found");
+        }
+
+        try {
+            loader.getDefinedPackage(null);
+            throw new RuntimeException("NullPointerException not thrown");
+        } catch (NullPointerException e) {
+        }
+    }
+
+    static class TestClassLoader extends ClassLoader {
+        public static final String PKG_NAME = "foo";
+
+        public TestClassLoader() {
+            super();
+            definePackage(PKG_NAME);
+        }
+
+        public Package definePackage(String name) {
+            return definePackage(name, null, null, null, null, null, null, null);
+        }
+    }
+}