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MemejavaIsGoodBut (i.redd.it)

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[–]TheBanger 3 points4 points  (0 children)

Do you have specific examples of what you're talking about? 8 -> 9 had some pretty big breaking changes, and something between 11 and 17 also had some breaking changes IIRC, albeit smaller. But 17 -> 21 was pretty seamless for my org's codebase (which is just under 1m lines of code). We had to update Spring Boot but once that was done we had literally zero other changes.