I think that the main problem upgrading beyond Java 8 is Java 9 and module system and a lot of javax package classes that were removed. It will be very helpful

I think that the main problem upgrading beyond Java 8 is Java 9 and module system and a lot of javax package classes that were removed. It will be very helpful a tool that can detect what modules or classes that are being used by your codebase and add them as maven or gradle dependencies and add them to the classpath.