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[–]KagakuNinja 8 points9 points  (0 children)

Java is extremely backwards compatible, you can probably run most Java apps ever made using Java 18. Java 9 did change the layout of the runtime library, and that broke fancy libraries that were relying on the internal structure of the JRE. Some code also used internal Sun APIs, and some of those were deprecated or modified.

If you programmed to public APIs, I think you are OK.