How to refer to gradle configuration set in gradle.properties with Kotlin DSL?

Question

I'm trying to adopt the Kotlin Gradle DSL. I have a gradle.properties with, among other things:

slf4jVersion=2.0.0-alpha1

I declare the dependency in build.gradle.kts with:

implementation( name = "slf4j-api",
  group = "org.slf4j", version = project.properties["slf4jVersion"].toString())

Yes, it works, but it also smells. The issue is the ugliness of project.properties["slf4jVersion"].toString()

Shouldn't I be able to just write slf4jVersion? It makes standard configuration look like a custom hack. What is the canonical and succinct way to keep version numbers together in a separate file with the Kotlin Gradle DSL?

Saurabh Thorat · Accepted Answer · 2020-11-10 10:50:13Z

2

You can access project properties via delegated properties.

In your build.gradle.kts:

val slf4jVersion: String by project
implementation(name = "slf4j-api", group = "org.slf4j", version = slf4jVersion)

Official sample: https://github.com/gradle/kotlin-dsl-samples/blob/3c977388f78bdcff1f7ed466e8d27feb5bf32275/samples/project-properties/build.gradle.kts#L14

answered Nov 10, 2020 at 10:50

Saurabh Thorat

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3 Comments

Travis Well Over a year ago

So every entry in gradle.properties needs a matching val delegation? This looks nicer but is also more fragile. I do appreciate the option, though. Maybe there could be a better way to declare the version numbers than in gradle.properties.

Arst Over a year ago

@TravisWell same question... have you found a solution?

Travis Well Over a year ago

@Arst no. now I just put versions in the gradle file instead of using a properties file. with a naming convention, it's easy to grep versions from the build.gradle.kts files, and a one-line bash script uses sed -i to update versions.

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