JavaExec

plugins {
    id 'java'
}

task runApp(type: JavaExec) {
  classpath = sourceSets.main.runtimeClasspath

  mainClass = 'package.Main'

  // arguments to pass to the application
  args 'appArg1'
}

// Using and creating an Executable Jar
jar {
  manifest {
    attributes('Main-Class': 'package.Main')
  }
}

task runExecutableJar(type: JavaExec) {
  // Executable jars can have only _one_ jar on the classpath.
  classpath = files(tasks.jar)

  // 'main' does not need to be specified

  // arguments to pass to the application
  args 'appArg1'
}

gradle someJavaExecTask --debug-jvm

task runApp(type: JavaExec) {
   ...

   debugOptions {
       enabled = true
       port = 5566
       server = true
       suspend = false
   }
}