src/java.desktop/share/classes/javax/imageio/ImageIO.java

@@ -1350,10 +1350,15 @@
         if (input == null) {
             throw new IllegalArgumentException("input == null!");
         }
 
         ImageInputStream stream = createImageInputStream(input);
+
+        if (stream == null) {
+            throw new IIOException("Can't create an ImageInputStream!");
+        }
+
         BufferedImage bi = read(stream);
         if (bi == null) {
             stream.close();
         }
         return bi;

@@ -1396,10 +1401,15 @@
             istream = input.openStream();
         } catch (IOException e) {
             throw new IIOException("Can't get input stream from URL!", e);
         }
         ImageInputStream stream = createImageInputStream(istream);
+
+        if (stream == null) {
+            throw new IIOException("Can't create an ImageInputStream!");
+        }
+
         BufferedImage bi;
         try {
             bi = read(stream);
             if (bi == null) {
                 stream.close();

@@ -1533,10 +1543,14 @@
             stream = createImageOutputStream(output);
         } catch (IOException e) {
             throw new IIOException("Can't create output stream!", e);
         }
 
+        if (stream == null) {
+            throw new IIOException("Can't create an ImageOutputStream!");
+        }
+
         try {
             return doWrite(im, writer, stream);
         } finally {
             stream.close();
         }

@@ -1575,10 +1589,14 @@
             stream = createImageOutputStream(output);
         } catch (IOException e) {
             throw new IIOException("Can't create output stream!", e);
         }
 
+        if (stream == null) {
+            throw new IIOException("Can't create an ImageOutputStream!");
+        }
+
         try {
             return doWrite(im, getWriter(im, formatName), stream);
         } finally {
             stream.close();
         }