8078165: [macosx] NPE when attempting to get image from toolkit

Reviewed-by: serb, alexp

jdk/src/java.desktop/share/classes/sun/awt/SunToolkit.java

@@ -843,14 +843,17 @@ public abstract class SunToolkit extends Toolkit
     }
 
     protected static boolean imageExists(String filename) {
-        checkPermissions(filename);
-        return filename != null && new File(filename).exists();
+        if (filename != null) {
+            checkPermissions(filename);
+            return new File(filename).exists();
+        }
+        return false;
     }
 
     @SuppressWarnings("try")
     protected static boolean imageExists(URL url) {
-        checkPermissions(url);
         if (url != null) {
+            checkPermissions(url);
             try (InputStream is = url.openStream()) {
                 return true;
             }catch(IOException e){

jdk/test/java/awt/Toolkit/GetImage/bug8078165.java

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2015, 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.awt.*;
+import java.net.URL;
+import java.security.Permission;
+
+
+/**
+ * @test
+ * @bug 8078165
+ * @summary NPE when attempting to get image from toolkit
+ * @author Anton Nashatyrev
+ */
+public final class bug8078165 {
+
+    public static void main(final String[] args) throws Exception {
+        // Mac only
+        System.setSecurityManager(new SecurityManager() {
+            @Override
+            public void checkPermission(Permission permission) {
+                // Just allows everything
+            }
+        });
+        // The method shouldn't throw NPE
+        Toolkit.getDefaultToolkit().getImage(new URL("file://./dummyImage@2x.png"));
+        Toolkit.getDefaultToolkit().getImage("./dummyImage@2x.png");
+    }
+}