Undo `api` -> `implementation` of Spring Boot and Dependency management plugin

[felixscheinost]

I don't understand the reasoning behind https://github.com/grails/grails-gradle-plugin/commit/42ba793ca27f2a6c751e53630d3d1e1313fea3e8

(Besides, this was done in a patch version of Grails and broke my build, that shouldn't happen)

My thinking:

• I want to use the Spring Boot version that the specific Grails version that I am using is compiled against. (Seems obvious)
• Newer versions of Gradle, and also the Grails starter recently, have pushed the use of buildSrc.
• Using buildSrc, it is idiomatic to have some references to e.g. org.springframework.boot.gradle.plugin.SpringBootPlugin, e.g. for dependency management
• For references to the above class, org.springframework.boot:spring-boot-gradle-plugin needs to be on the compile classpath of buildSrc
• Before Grails 6.1.2, where org.springframework.boot:spring-boot-gradle-plugin was still api, I could do the following:

dependencies {
  implementation("org.grails:grails-gradle-plugin:${project.property("grailsVersion")}")
  implementation("org.springframework.boot:spring-boot-gradle-plugin")
  implementation("io.spring.gradle:dependency-management-plugin")
}

I didn't have to specify versions for the other two plugins.

• Since Grails 6.1.2 because of https://github.com/grails/grails-gradle-plugin/commit/42ba793ca27f2a6c751e53630d3d1e1313fea3e8 I now have to manually lookup what versions I have to use which is cumbersome.

[matrei]

While I acknowledge what you are saying, I'm not sure that having these dependencies on the compile classpath of all downstream projects is the correct way to solve this.

Also, I believe the springboot version you are referring to is not actually the one defined in the version of grails you are using but the one defined in grails-gradle-plugin which at the moment could be different versions.

A better way, would perhaps be if these dependencies were added to grails-bom (or a new grails-build-bom). Then the versions could be imported by both grails-gradle-plugin and any grails project that would like to use them with synced-up versions.

Regarding the change in patch release version, these dependencies were (to my understanding) never meant to be exposed, but it could not be prevented with previous versions of Gradles compile scope and then it got changed to the unnecessarily open api when upgrading to Gradle 7.