Needs Java 17 for development now

[daniel-beck]

Amends #9358. Enforcer now complains when trying to build with 11.

[MarkEWaite]

Documentation change with no risk to code stability. Merging immediately to save CI costs and include in master branch.

[farhadmammadli]

@MarkEWaite I would also build jenkins/jenkins:latest tag (java 11 installed) same as jenkins/jenkins:latest-jdk17.
Otherwise, those who run jenkins from default tag inside container will have trouble if they will update the app from menu.

[MarkEWaite]

@MarkEWaite I would also build jenkins/jenkins:latest tag (java 11 installed) same as jenkins/jenkins:latest-jdk17. Otherwise, those who run jenkins from default tag inside container will have trouble if they will update the app from menu.

Thanks for the comment but as far as I can tell, that was completed the same week that 2.463 was delivered.

I confirmed that it is still the case with the command:

$ docker run --rm -i -t jenkins/jenkins:latest java -version
openjdk version "17.0.11" 2024-04-16
OpenJDK Runtime Environment Temurin-17.0.11+9 (build 17.0.11+9)
OpenJDK 64-Bit Server VM Temurin-17.0.11+9 (build 17.0.11+9, mixed mode)

$ docker run --rm -i -t jenkins/jenkins:2.463 java -version
openjdk version "17.0.11" 2024-04-16
OpenJDK Runtime Environment Temurin-17.0.11+9 (build 17.0.11+9)
OpenJDK 64-Bit Server VM Temurin-17.0.11+9 (build 17.0.11+9, mixed mode)