Oracle JDK has some internal classes that are not part of OpenJDK. These include code that is used to read and write JPeg images, for example:

com/sun/image/codec/jpeg/JPEGImageDecoder

But generally everything under the com/sun/image/codec/jpeg package.

This is a very old problem and application should have moved away from internal classes but we still encounter some that use them and break on OpenJDK.

It would be nice to have a rule that can tell the customer to not use these classes, and instead use the official javax.imageio.ImageIO for similar functionality.

For some additional information, please refer to this:

https://access.redhat.com/solutions/443673