kotlin - 即使使用默认目录结构，`gradlew run`也找不到主kotlin类

我项目的gradle/kotlin目录结构遵循默认/推荐的方法:

MYPROJ
      /src/main/kotlin
                       app/OnsetsWebapp.kt

这是build.gradle.kts:注意，我们指定了mainClassName = app.OnsetsWebapp:

plugins {
  application
  kotlin("jvm") version "1.3.71"
}

application {
  mainClassName = "app.OnsetsWebapp"
}

dependencies {
  compile(kotlin("stdlib"))
  compile("org.slf4j:slf4j-simple:1.7.25")
  compile("io.javalin:javalin:3.8.0")
  compile("org.json:json:20160810")
  compile("com.j2html:j2html:1.3.0")
}

repositories {
  jcenter()
}

让我们来构建它:./gradlew build

BUILD SUCCESSFUL in 1s
8 actionable tasks: 5 executed, 3 up-to-date

现在运行它:

 $./gradlew run

这导致

> Task :run FAILED
Error: Could not find or load main class app.OnsetsWebapp
Caused by: java.lang.ClassNotFoundException: app.OnsetsWebapp

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':run'.
> Process 'command '/Library/Java/JavaVirtualMachines/openjdk-11.0.2.jdk/Contents/Home/bin/java'' finished with non-zero exit value 1

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 0s
4 actionable tasks: 1 executed, 3 up-to-date

那么为什么找不到app.OnsetsWebapp类呢？

最佳答案

我相信应该是:
申请{
mainClassName =“app.OnsetsWebappKt”
}
如果查看build/classes/kotlin/main/app文件夹，则应该在其中看到两个类文件:OnsetsWebappKt和OnsetsWebapp。您想要一个带有Kt后缀的