如何从命令行将参数传递给Gradle

Question

I try to pass arguments from command line to gradle.

My build.gradle is:

task execute(type:JavaExec) {
   main = mainClass
   classpath = sourceSets.main.output
}

When I do:

gradle -PmainClass=Hello execute

I get this:

FAILURE: Build failed with an exception.

* Where:
Build file '/home/example2/build.gradle' line: 7

* What went wrong:
A problem occurred evaluating root project 'example2'.
> Could not find property 'sourceSets' on task ':execute'.

My question is that what should I provide for main? name of any java file package? any specific path? What should actually be sourceSet?

Answer 1

Your minimal build.gradle file should look like this:

apply plugin: 'java'

task execute(type:JavaExec) {
   main = mainClass
   classpath = sourceSets.main.output
}

And you need a java class located in src/main/java/Hello.java like this:

public class Hello {

    public static void main(String[] a) {}

}