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

*** 1350,1359 ****
--- 1350,1364 ----
          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;
*** 1396,1405 ****
--- 1401,1415 ----
              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();
*** 1533,1542 ****
--- 1543,1556 ----
              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();
          }
*** 1575,1584 ****
--- 1589,1602 ----
              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();
          }