FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
Certain JPEGs with embedded thumbnails in APP1 markers throw an exception when attempting to read in the width of second preview image. Example image is here:

https://github.com/haraldk/TwelveMonkeys/issues/202

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Call getWidth on the image reader for the second image:

ImageReader reader;
int pageNum = 1;
int width = reader.getWidth(pageNum + reader.getMinIndex());

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The thumbnail width is returned
ACTUAL -
Caused by: javax.imageio.IIOException: Not a JPEG file: starts with 0xff 0xe9
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readImageHeader(JPEGImageReader.java)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readNativeHeader(JPEGImageReader.java:609)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.readHeader(JPEGImageReader.java:603)
at com.sun.imageio.plugins.jpeg.JPEGImageReader.getWidth(JPEGImageReader.java:716)

REPRODUCIBILITY :
This bug can be reproduced always.