8032788: ImageIcon constructor throws an NPE and hangs when passed a null String parameter

Reviewed-by: pchelko, serb

src/share/classes/sun/awt/image/FileImageSource.java

@@ -48,6 +48,10 @@ public class FileImageSource extends InputStreamImageSource {
     }
 
     protected ImageDecoder getDecoder() {
+        if (imagefile == null) {
+            return null;
+        }
+
         InputStream is;
         try {
             is = new BufferedInputStream(new FileInputStream(imagefile));

test/java/awt/image/ImageIconHang.java

+/*
+ * Copyright (c) 2014, 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.*;
+
+/*
+ * @test
+ * @bug     8032788
+ * @summary Checks that null filename argument is processed correctly
+ *
+ * @run     main ImageIconHang
+ */
+public class ImageIconHang {
+    public static void main(String[] args) throws Exception {
+        Image image = Toolkit.getDefaultToolkit().getImage((String) null);
+        MediaTracker mt = new MediaTracker(new Component() {});
+        mt.addImage(image, 1);
+        mt.waitForID(1, 5000);
+
+        int status = mt.statusID(1, false);
+
+        System.out.println("Status: " + status);
+
+        if (status != MediaTracker.ERRORED) {
+            throw new RuntimeException("MediaTracker.waitForID() hung.");
+        }
+    }
+}