Gradle application plugin with multiple main classes

Question

I'm using the gradle 'application' plugin to start my application. This works well. Now I want to add the option to start a different main class in the same project. Can I change the plugin's configuration to allow that?

apply plugin: 'application'

mainClassName = "net.worcade.my.MainClass"

Answer 1

From http://mrhaki.blogspot.com/2010/09/gradle-goodness-run-java-application.html

apply plugin: 'java'

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

Clearly then what you can change:

• runSimple can be named whatever you want
• set main as appropriate
• clear out args and systemProperty if not needed

To run:

gradle runSimple

You can put as many of these as you like into your build.gradle file.

Answer 2

You can directly configure the Application Plugin with properties:

application {
    mainClassName = project.findProperty("chooseMain").toString()
}

And after in command line you can pass the name of the main class:

./gradlew run -PchooseMain=net.worcade.my.MainClass