Java 7 ImageIO can fail to read and write in Windows 7 due to permissions problems

Question

I had a program running in Windows 7 64 bit using Java 6 which fails using Java 7. ImageIO it seems makes temporary cache files when reading and writing. In my Eclipse IDE, ImageIO now hangs with no error messsage. In another machine, I get an IOException permission denied.

The workaround I've adopted is to read the image using Toolkit.createImage and convert to a BufferedImage. This doesn't seem to need to create any files but is clunky. I am now writing by converting to a byte array.

Is anyone else having these problems?

Answer 1

I had a performance problem with those cached files and solved it by calling javax.imageio.ImageIO.setUseCache(false) . As long as the original image files are already on a disk already, there shouldn't be a performance penalty.