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The only problem we see with our old legacy Java code is third-party libraries. Some of them do not exist in newer versions.


What do you mean? Unless they use sun.*, those old libraries should be fine.


Since Java 9 deprecated APIs are actually removed, and since Java 16 naughty reflection tricks are forbidden.


Both are rare to encounter. I think migration of JavaEE to JakartaEE had bigger impact than anything else, but even in that case working with javax packages is still possible.




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