How to use plugin version from gradle.properties in Gradle Kotlin DSL?

There are a couple issues that have some details around this:

• gradle/kotlin-dsl#480
• gradle/gradle#1697

The way to do this in the most recent verions of Gradle is to use settings.gradle or settings.gradle.kts and the pluginManagement {} block.

In your case, it could look like:

pluginManagement {
  resolutionStrategy {
    eachPlugin {
      when (requested.id.id) {
        "org.jetbrains.kotlin.plugin.allopen" -> {
          val kotlinVersion: String by settings
          useVersion(kotlinVersion)
        }
        "org.jetbrains.kotlin.jvm" -> {
          val kotlinVersion: String by settings
          useVersion(kotlinVersion)
        }
        "org.springframework.boot" -> {
          val springBootPluginVersion: String by settings
          useVersion(springBootPluginVersion)
        }
        "io.spring.dependency-management" -> {
          val springDependencyManagementPluginVersion: String by settings
          useVersion(springDependencyManagementPluginVersion)
        }
      }
    }
  }
}

(Cross-post: source)

Apparently this has become possible recently, if it wasn't possible in the past. (Almost) from the docs:

gradle.properties:

helloPluginVersion=1.0.0

settings.gradle.kts:

pluginManagement {
  val helloPluginVersion: String by settings
  plugins {
    id("com.example.hello") version helloPluginVersion
  }
}

And now the docs say that build.gradle.kts should be empty but my testing shows that you still need this in build.gradle.kts:

plugins {
  id("com.example.hello")
}

The version is now determined by settings.gradle.kts and hence by gradle.properties which is what we want...