Require at least Java 11 about hop HOT 2 CLOSED

With Spring's RestTemplate being in maintenance mode and Spring planning to require Java 17 by the end of 2022, the Client should consider migrating to another HTTP layer. The HttpClient introduced in Java 11 is a good candidate. That would imply requiring Java 11 for Hop, but this is a reasonable decision.

If possible without too much hassle, we could squeeze JDK's HttpClient along the RestTemplate in Client and deprecate any method involving some RestTemplate configuration in a major version and then remove RestTemplate all together in another major version.

from hop.

I think it's perfectly fine to require Java 11. Older releases can still be used just fine on Java 8.

from hop.