8136831: Undefined null behavior in ClassLoader.getResourceXXXX()

Reviewed-by: alanb, mchung, psandoz

jdk/src/java.base/share/classes/java/lang/ClassLoader.java

@@ -1335,10 +1335,12 @@ public abstract class ClassLoader {
      * @return  A <tt>URL</tt> object for reading the resource, or
      *          <tt>null</tt> if the resource could not be found or the invoker
      *          doesn't have adequate  privileges to get the resource.
+     * @throws  NullPointerException If {@code name} is {@code null}
      *
      * @since  1.1
      */
     public URL getResource(String name) {
+        Objects.requireNonNull(name);
         URL url;
         if (parent != null) {
             url = parent.getResource(name);
@@ -1382,12 +1384,14 @@ public abstract class ClassLoader {
      *
      * @throws  IOException
      *          If I/O errors occur
+     * @throws  NullPointerException If {@code name} is {@code null}
      *
      * @see  #findResources(String)
      *
      * @since  1.2
      */
     public Enumeration<URL> getResources(String name) throws IOException {
+        Objects.requireNonNull(name);
         @SuppressWarnings("unchecked")
         Enumeration<URL>[] tmp = (Enumeration<URL>[]) new Enumeration<?>[2];
         if (parent != null) {
@@ -1434,11 +1438,14 @@ public abstract class ClassLoader {
      *          that the class loader doesn't have access to will not be in the
      *          stream.
      *
+     * @throws  NullPointerException If {@code name} is {@code null}
+     *
      * @see  #findResources(String)
      *
      * @since  9
      */
     public Stream<URL> resources(String name) {
+        Objects.requireNonNull(name);
         int characteristics = Spliterator.NONNULL | Spliterator.IMMUTABLE;
         Supplier<Spliterator<URL>> si = () -> {
             try {
@@ -1600,10 +1607,12 @@ public abstract class ClassLoader {
      *
      * @return  An input stream for reading the resource, or <tt>null</tt>
      *          if the resource could not be found
+     * @throws  NullPointerException If {@code name} is {@code null}
      *
      * @since  1.1
      */
     public InputStream getResourceAsStream(String name) {
+        Objects.requireNonNull(name);
         URL url = getResource(name);
         try {
             return url != null ? url.openStream() : null;

jdk/src/java.base/share/classes/java/net/URLClassLoader.java

@@ -42,6 +42,7 @@ import java.security.SecureClassLoader;
 import java.util.Enumeration;
 import java.util.List;
 import java.util.NoSuchElementException;
+import java.util.Objects;
 import java.util.Set;
 import java.util.WeakHashMap;
 import java.util.jar.Attributes;
@@ -301,9 +302,12 @@ public class URLClassLoader extends SecureClassLoader implements Closeable {
      * @return  An input stream for reading the resource, or {@code null}
      *          if the resource could not be found
      *
+     * @throws  NullPointerException If {@code name} is {@code null}
+     *
      * @since  1.7
      */
     public InputStream getResourceAsStream(String name) {
+        Objects.requireNonNull(name);
         URL url = getResource(name);
         try {
             if (url == null) {

jdk/test/java/lang/ClassLoader/GetResourceNullArg.java

@@ -0,0 +1,96 @@
+/*
+ * 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.
+ */
+
+import java.io.IOException;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Paths;
+import java.util.Enumeration;
+import java.util.stream.Stream;
+import org.testng.annotations.*;
+
+/*
+ * @test
+ * @bug 8136831
+ * @summary Test null argument to ClassLoader.getResourceXXXX()
+ * @run testng GetResourceNullArg
+ */
+
+public class GetResourceNullArg {
+    private static class MyClassLoader extends ClassLoader {
+        public MyClassLoader() {
+            super(null);
+        }
+        @Override
+        public Class findClass(String name) throws ClassNotFoundException {
+            throw new ClassNotFoundException("Why are you using this?");
+        }
+    }
+
+    @DataProvider
+    public static ClassLoader[][] provider() {
+        try {
+            return new ClassLoader[][] {
+                { ClassLoader.getSystemClassLoader() },
+                { new MyClassLoader() },
+                { new URLClassLoader(new URL[]{ Paths.get(".").toUri().toURL() },
+                                     ClassLoader.getSystemClassLoader()) }
+            };
+        } catch (MalformedURLException e) { throw new RuntimeException(e); }
+    }
+
+    @Test(expectedExceptions = NullPointerException.class)
+    public void classGetResource() {
+        this.getClass().getResource(null);
+    }
+
+    @Test(expectedExceptions = NullPointerException.class)
+    public void classGetResourceAsStream() {
+        this.getClass().getResourceAsStream(null);
+    }
+
+    @Test(dataProvider = "provider",
+          expectedExceptions = NullPointerException.class)
+    public void loaderGetResource(ClassLoader cl) {
+        cl.getResource(null);
+    }
+
+    @Test(dataProvider = "provider",
+          expectedExceptions = NullPointerException.class)
+    public static void loaderGetResources(ClassLoader cl) throws IOException {
+        Enumeration<URL> retVal = cl.getResources(null);
+    }
+
+    @Test(dataProvider = "provider",
+          expectedExceptions = NullPointerException.class)
+    public static void loaderResources(ClassLoader cl) throws IOException {
+        Stream<URL> retVal = cl.resources(null);
+    }
+
+    @Test(dataProvider = "provider",
+          expectedExceptions = NullPointerException.class)
+    public void loaderGetResourceAsStream(ClassLoader cl) {
+        cl.getResourceAsStream(null);
+    }
+}