abstract class Greeting extends DefaultTask { // <1>
    @Input
    abstract Property<String> getGreeting() // <2>

    @Internal
    final Provider<String> message = greeting.map { it + ' from Gradle' } // <3>

    @TaskAction
    void printMessage() {
        logger.quiet(message.get())
    }
}

tasks.register("greeting", Greeting) {
    greeting.set('Hi') // <4>
    greeting = 'Hi' // <5>

public class GreetingTask extends DefaultTask {

    private String greeting = "hello from GreetingTask";

    public void setGreeting(String greeting) {
        this.greeting = greeting;
    }

    @Input
    public String getGreeting() {
        return greeting;
    }

    @TaskAction
    public void greet() {
        System.out.println(greeting);
    }

public class GreetingTask extends DefaultTask {

    private String greeting = "hello from GreetingTask";

    public void setGreeting(String greeting) {
        this.greeting = greeting;
    }

    @Input
    public String getGreeting() {
        return greeting;
    }

    @TaskAction
    public void greet() {
        System.out.println(greeting);
    }

> Task :greeting-plugin:compileJava
> Task :greeting-plugin:pluginDescriptors
> Task :greeting-plugin:processResources
> Task :greeting-plugin:classes
> Task :greeting-plugin:jar

> Task :my-greeting-app:greeting
Hi Bob!!!

BUILD SUCCESSFUL in 0s

        def producer = file('producer')
        def consumer = file('consumer')
        def pluginModule = mavenRepo.module('com.example', 'producer', '1.0')
        def pluginMarker = mavenRepo.module('com.example.greeting', 'com.example.greeting.gradle.plugin', '1.0')

        producer.file('settings.gradle') << ''
        producer.file('build.gradle') << """
            plugins {
                id('java-gradle-plugin')

        def producer = file('producer')
        def consumer = file('consumer')
        def pluginModule = mavenRepo.module('com.example', 'producer', '1.0')
        def pluginMarker = mavenRepo.module('com.example.greeting', 'com.example.greeting.gradle.plugin', '1.0')

        producer.file('settings.gradle').createFile()
        producer.file('build.gradle') << """
            plugins {
                id('java-gradle-plugin')

		fmt.Fprintln(w, "Hello, client")
	}))
	defer ts.Close()

	res, err := http.Get(ts.URL)
	if err != nil {
		log.Fatal(err)
	}
	greeting, err := io.ReadAll(res.Body)
	res.Body.Close()
	if err != nil {
		log.Fatal(err)
	}

	fmt.Printf("%s", greeting)
	// Output: Hello, client
}

func ExampleServer_hTTP2() {

executable: gradle
args: greeting
flags: "--include-build=greeting-plugin"

# tag::cli[]
# gradle greeting
# end::cli[]
executable: gradle
args: greeting

            doLast {
                println("Hello from plugin 'com.tutorial.greeting'")
            }
        }
    }
}
----
=====

As we can see, the `license` plugin, when applied, exposes a `greeting` task with a simple print statement.

== Step 5. View Plugin Tasks

When the `license` plugin is applied to the `app` project, the `greeting` task becomes available: