Gradle Kotlin DSL 无法识别 buildscript 中的 ext [英] ext in buildscript can not be recognised by Gradle Kotlin DSL

问题描述

这几天在尝试写一些代码来体验一下Spring 5中的Spring反应式特性和kotlin扩展，还准备了一个gradle Kotlin DSL build.gradle.kt来配置gradle build.

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.

build.gradle.kt 由http://生成的Spring Boot模板代码转换而来start.spring.io.

但是Gradle检测不到buildscript中的ext.

But the ext in the buildscript can not be detected by Gradle.

buildscript {
  ext { }
}

ext 会导致 Gradle 构建错误.

The ext will cause Gradle build error.

在classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")和compile("org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlinVersion") 工作，我以困难的方式添加了变量.

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"

但我必须在全局顶级位置声明它们并在buildscript中复制它们.

But I have to declare them in global top location and duplicate them in the buildscript.

代码:https://github.com/hantsy/spring-reactive-sample/blob/master/kotlin-gradle/build.gradle.kts

是否有一种优雅的方法可以让 ext 工作?

Is there a graceful approach to make ext work?

更新:有一些丑陋的方法:

1. 来自 Gradle Kotlin DSL 示例，https://github.com/gradle/kotlin-dsl/tree/master/samples/project-properties，在gradel.properties中声明属性.

1. 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

并在 build.gradle.kts 中使用它.

And use it in build.gradle.kts.

buildScript{
   val kotlinVersion by project

}
 val kotlinVersion by project //another declare out of buildscript block.

与上面类似，在 buildScript 块中声明它们:

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.

如何避免重复val kotlinVersion: String by extra?

推荐答案

With Kotlin DSL ext 已经改为 extra 可以在 buildscript 下使用了.

With Kotlin DSL ext has been changed to extra and it can be used under buildscript.

例如:-

buildscript {
    // Define versions in a single place
    extra.apply{
        set("minSdkVersion", 26)
        set("targetSdkVersion", 27)
    }
}

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