package org.gradle.sample;

import org.apache.log4j.LogManager;

public class SimpleGreeter {
    public String getGreeting() throws Exception {
        LogManager.getRootLogger().info("generating greeting.");
        return "Hello world!";
    }

import org.junit.Test;
import static org.junit.Assert.*;

public class AppTest {
    @Test public void appHasAGreeting() {
        App classUnderTest = new App();
        assertNotNull("app should have a greeting", classUnderTest.getGreeting());
    }

                @Internal
                public Property<String> getGreeting() {
                    return greeting;
                }

                @TaskAction
                public void run() {
                    System.out.println(getGreeting().get());
                }
            }
        """

        buildFile << """

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>

// tag::add-property[]
abstract class GreetingTask extends DefaultTask {
    @Input
    abstract Property<String> getGreeting()

    GreetingTask() {
        greeting.convention('hello from GreetingTask')
    }

    @TaskAction
    def greet() {
        println greeting.get()
    }
}

// Use the default greeting
tasks.register('hello', GreetingTask)

// Customize the greeting
tasks.register('greeting',GreetingTask) {

package pkg;

public class Java {
    public static String getGreeting() {
        return "Hello world!";
    }

${fileComment.multilineComment}${packageDecl.statement}
class App {
    String getGreeting() {
        return 'Hello World!'
    }

    static void main(String[] args) {
        println new App().greeting
    }

package org.gradle.sample;

import java.io.InputStream;
import org.apache.log4j.LogManager;
import org.apache.commons.io.IOUtils;

public class Greeter {
    public String getGreeting() throws Exception {
        LogManager.getRootLogger().info("generating greeting.");
        InputStream greetingStr = getClass().getResourceAsStream("/greeting.txt");
        try {
            return IOUtils.toString(greetingStr).trim();
        }
        finally {

[source,java]
----
package authoring.tutorial;

import com.gradle.CustomLib;

public class App {
    public String getGreeting() {
        return "CustomLib identifier is: " + CustomLib.identifier;
    }

    public static void main(String[] args) {
        System.out.println(new App().getGreeting());
    }
}
----

Next, let's run the task with `./gradlew :app:license`:

[source,text]
----

package org.gradle.sample;

import org.apache.log4j.LogManager;

public class SimpleGreeter {
    public String getGreeting() throws Exception {
        LogManager.getRootLogger().info("generating greeting.");
        return "Hello world!";
    }