Review Google AppEngine documentation

[mhalbritter]

In https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#deployment.cloud.google, we document how to run a Boot application in Google AppEngine. It contains this snippet:

runtime_config:
  jdk: "openjdk8"

This won't work, as Spring Boot 3.x needs Java 17. I'm not sure if AppEngine has support for Java 17. If it has, update the snippet in the documentation.

[shantanusingh10]

Right now GCP only supports jdk8 and jdk11. So, what can we do for this requirement of Java 17 ?

Source - https://github.com/GoogleCloudPlatform/openjdk-runtime

[wilkinsona]

I don't think the version of Java in their base Docker image is relevant here. The GAE documentation states that Java 17 is supported.

[snicoll]

There are some other bits that are outdated in that section.