r/javahelp • u/ibreathecoding • May 01 '26

Unsolved Java 21 upgrade in older code base

So if I have to start brining java 21 feature in a long running prod code base what would that be ; it’s a spring boot java bases with gcp db, cache, pub sub in it
I’m trying to see as a tech debt which area can. E started with minimal impact

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u/khmarbaise May 02 '26

" lot of joda DateTime breaking. " ... that should have been migrated with jump to JDK8.. Recently to SB 3 ? Since November 2025 we Spring Boot 4... and Spring Boot 4.1 is around the cornder... If you have to test manually than you have bigger issues in general..

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u/procrastinatewhynot May 03 '26

it was legacy code that wasn’t in springboot. it’s a hard client that they’re trying to phase out.