定义删除任务时出错

Question

我在使用以下 DSL 脚本块时遇到错误。

val DerbyDbDataFolder: File = file("DerbyDbData")
val DerbyLog: File = file("derby.log")

tasks {
    var cleanDerbyDbData by creating (Delete::class) {
        delete(DerbyDbDataFolder)
        delete(DerbyLog)
    }

    "clean" {
        dependsOn(cleanDerbyDbData)
    }
}

但是我收到以下错误消息。

       var cleanDerbyDbData by creating (Delete::class) {
                               ^ Missing 'setValue(Nothing?, KProperty<*>, Delete)' method on delegate of type 'PolymorphicDomainObjectContainer<Delete>'

此错误消息是什么，我该如何解决？

Answer 1

TLDR

将 cleanDerbyDbData 定义为 val 而不是 var：

val DerbyDbDataFolder: File = file("DerbyDbData")
val DerbyLog: File = file("derby.log")

tasks {
    val cleanDerbyDbData by creating (Delete::class) {
        delete(DerbyDbDataFolder)
        delete(DerbyLog)
    }

    "clean" {
        dependsOn(cleanDerbyDbData)
    }
}

详情

cleanDerbyDbData 是 creating() 函数返回的 delegated property, and for it to be a var, the expression to the right of by must return a mutable value. The PolymorphicDomainObjectContainerDelegateProvider 不提供任何设置器，这就是您看到的错误。

定义删除任务时出错

Error defining delete task

gradle-kotlin-dsl

TLDR

详情