See #18536
Comment From: dreis2211
Do we have some documentation about minimum supported versions in general, @philwebb ? I recently noticed that Spring-Boot apps on Jetty 9.4.14.v20181114 don't work with Spring-Boot 2.2 anymore, for example. Not directly relevant for this issue, but the "earlier" might be less versions than one would think ;)
Comment From: wilkinsona
We don't. Generally speaking it is only safe to assume that the version Boot uses by default and later maintenance versions are supported. This could be because Boot relies on a bug fix or because there's been a breaking change in a third-party maintenance release that causes a compatibility problem. You can read this issue as a little more than a reminder to remove the code that tolerates 9.4.21 and earlier.
Comment From: dreis2211
That's what I thought as well. The issue reminded me of asking though.
Comment From: philwebb
Yeah, this issue was mainly me reminding myself that in we'll be able to drop that reflection code in the Boot 2.3.
Comment From: snicoll
Isn't that issue superseded somehow by https://github.com/spring-projects/spring-boot/issues/18842? I see that the related commit already removed the reflection code.
Comment From: wilkinsona
We still have tests that verify compatibility with the older version.