In these days, I am trying to write some codes to experience the Spring reactive features and kotlin extension in Spring 5, and I also prepared a gradle Kotlin DSL build.gradle.kt to configure the gradle build.
The build.gradle.kt
is converted from Spring Boot template codes generated by http://start.spring.io.
But the ext
in the buildscript
can not be detected by Gradle.
buildscript {
ext { }
}
The ext
will cause Gradle build error.
To make the variables in classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")
and compile("org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlinVersion")
work, I added the variables in the hard way.
val kotlinVersion = "1.1.4"
val springBootVersion = "2.0.0.M3"
But I have to declare them in global top location and duplicate them in the buildscript
.
Code: https://github.com/hantsy/spring-reactive-sample/blob/master/kotlin-gradle/build.gradle.kts
Is there a graceful approach to make ext
work?
Update: There are some ugly approaches:
From Gradle Kotlin DSL example, https://github.com/gradle/kotlin-dsl/tree/master/samples/project-properties, declares the properties in gradel.properties.
kotlinVersion = 1.1.4
springBootVersion = 2.0.0.M3
And use it in build.gradle.kts.
buildScript{
val kotlinVersion by project
}
val kotlinVersion by project //another declare out of buildscript block.
Similar with above declare them in buildScript block:
buildScript{
extra["kotlinVersion"] = "1.1.4"
extra["springBootVersion"] = "2.0.0.M3"
val kotlinVersion: String by extra
}
val kotlinVersion: String by extra//another declare out of buildscript block.
How can I avoid the duplication of val kotlinVersion: String by extra?
With Kotlin DSL ext has been changed to extra and it can be used under buildscript.
Eg :-
buildscript {
// Define versions in a single place
extra.apply{
set("minSdkVersion", 26)
set("targetSdkVersion", 27)
}
}