ADDITIONAL SYSTEM INFORMATION :
generic

A DESCRIPTION OF THE PROBLEM :
The issue was oberserved first in JDK 8 u242. However the code is still the same in JDK 12.
When reading hugh images with the MemoryCacheImageInputStream it happens that following exception is thrown:

java.lang.ArrayIndexOutOfBoundsException
    at javax.imageio.stream.MemoryCache.read(MemoryCache.java:327)
    at javax.imageio.stream.MemoryCacheImageInputStream.read(MemoryCacheImageInputStream.java:115)
    at javax.imageio.stream.ImageInputStreamImpl.readShort(ImageInputStreamImpl.java:228)
    at javax.imageio.stream.ImageInputStreamImpl.readUnsignedShort(ImageInputStreamImpl.java:242)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFIFD.initialize(TIFFIFD.java:237)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFImageMetadata.initializeFromStream(TIFFImageMetadata.java:148)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFImageReader.readMetadata(TIFFImageReader.java:911)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFImageReader.seekToImage(TIFFImageReader.java:864)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFImageReader.seekToImage(TIFFImageReader.java:822)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFImageReader.getWidth(TIFFImageReader.java:1080)

This is due to the line 323 (line 336 in JDK 12) i the class MemoryCache Line 323:

int offset = (int)pos % BUFFER_LENGTH;
This results for the specific use case in offset being -8184

I think the line should actually be
int offset = (int)(pos % BUFFER_LENGTH);
This way offset will be 8.

The image is readable when explicitly a FileCacheImageInputStream is used.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Read an Image via the class MemoryCacheImageInputStream.

More specifically, using ImageIO.createImageInputStream(imageStream) will use a MemoryCacheImageInputStream e.g. if the image (e.g Tiff) is an entry within in zip file and big enough 32768x32768 pixel. But also other input streams should do.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The image should be read and no exception should occur.
ACTUAL -
java.lang.ArrayIndexOutOfBoundsException
    at javax.imageio.stream.MemoryCache.read(MemoryCache.java:327)
    at javax.imageio.stream.MemoryCacheImageInputStream.read(MemoryCacheImageInputStream.java:115)
    at javax.imageio.stream.ImageInputStreamImpl.readShort(ImageInputStreamImpl.java:228)
    at javax.imageio.stream.ImageInputStreamImpl.readUnsignedShort(ImageInputStreamImpl.java:242)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFIFD.initialize(TIFFIFD.java:237)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFImageMetadata.initializeFromStream(TIFFImageMetadata.java:148)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFImageReader.readMetadata(TIFFImageReader.java:911)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFImageReader.seekToImage(TIFFImageReader.java:864)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFImageReader.seekToImage(TIFFImageReader.java:822)
    at it.geosolutions.imageioimpl.plugins.tiff.TIFFImageReader.getWidth(TIFFImageReader.java:1080)


CUSTOMER SUBMITTED WORKAROUND :
The image is readable when explicitly a FileCacheImageInputStream is used.

FREQUENCY : always