Gradle application plugin with kotlin DSL with multiple main classes

Question

I am have a java application that has multiple main classes, the build.gradle is written in kotlin and named build.gradle.kts

It is failing with error Build failed with an exception

Script compilation errors:

Line 50: task(runSimple, dependsOn: "classes", type: JavaExec) {

Expecting ')'

I can solve the problem by using build.gradle as shown in Gradle application plugin with multiple main classes

but team want to stay with kotlin

apply plugin: 'java'

task(runSimple, dependsOn: 'classes', type: JavaExec) { 
   main = 'com.mrhaki.java.Simple'
   classpath = sourceSets.main.runtimeClasspath
   args 'mrhaki'
   systemProperty 'simple.message', 'Hello '
}

is the code when build.gradle is used and it does work,

but

plugins {
  java 
  application
}

task(runSimple, dependsOn: 'classes', type: JavaExec) {
   main = 'com.mrhaki.java.Simple'
   classpath = sourceSets.main.runtimeClasspath
   args 'mrhaki'
   systemProperty 'simple.message', 'Hello '
}

does not work

It should be able to run the class com.mrhaki.java.Simple but does not

I guess the kotlin translation is not correct.

Answer 1

I finally found execute JavaExec task using gradle kotlin dsl and that helped me. It can be run from command line as ./gradlew runSimple --debug-jvm

group = "com.lapots.breed"
version = "1.0-SNAPSHOT"

plugins {
    java
}

java {
    sourceCompatibility = JavaVersion.VERSION_1_8
}

repositories {
    mavenCentral()
}

task("runSimple", JavaExec::class) {
    main = "com.mrhaki.java.Simple"
    classpath = sourceSets["main"].runtimeClasspath
}

Answer 2

if you want debug also then modify task as follows and run with ./gradlew runSimple , taken from gradle: change default port from 5005

no --debug-jvm needed

task("runSimple", JavaExec::class) {
    main = "com.mrhaki.java.Simple"
    classpath = sourceSets["main"].runtimeClasspath

jvmArgs= listOf( "-Xdebug", "-agentlib:jdwp=transport=dt_socket,address=8787,server=y,suspend=y")
    }