How to rotate JPEG images based on the orientation metadata?

Question

I have some server code that is generating thumbnails when an image is uploaded. The issue is that when the image was taken and the camera/device was rotated, the thumbnail

Answer 1

As dnault mentioned in previous comment, Thumbnaliator library resolves the issue. But you should use correct input/output formats to avoid color change on this automatic rotation.

ByteArrayOutputStream baos = new ByteArrayOutputStream();
ByteArrayInputStream in = new ByteArrayInputStream(file.getContents());
Thumbnails.of(in)
    .scale(1)
    .toOutputStream(baos);
byte[] bytes = baos.toByteArray();