buildFile << """
            class TaskWithNestedProperty extends DefaultTask  {
                @Nested
                Object bean
            }

            class NestedBeanWithInput {
                @InputFiles
                FileCollection input
            }

            class GeneratorTask extends DefaultTask {
                @OutputFile

    @Issue("https://issues.gradle.org/browse/GRADLE-3540")
    def "order of #annotation marks task not up-to-date"() {
        buildFile << """
            class MyTask extends DefaultTask {
                @Output${files ? "Files" : "Directories"} FileCollection out

                @TaskAction def exec() {

        myProperty.set("Hello, Gradle!")
        println myProperty.get()
    }
}
// end::object-factory[]

// tag::object-factory-inject[]
abstract class MyObjectFactoryTask extends DefaultTask {
    private ObjectFactory objectFactory

    @Inject //@javax.inject.Inject
    MyObjectFactoryTask(ObjectFactory objectFactory) {
        this.objectFactory = objectFactory
    }

    @TaskAction

            class TestTask extends DefaultTask { @Input String property }
        """

        expect:
        succeeds "all"
    }

    def "can define task using type Task"() {
        buildFile << """
            task thing(type: Task) { t ->
                assert t instanceof DefaultTask
                doFirst { println("thing") }
            }
        """

        configurationCacheFails ":foo:dependent"

        then:
        problems.assertFailureHasProblems(failure) {
            withProblem("Task `:foo:dependent` of type `org.gradle.api.DefaultTask`: cannot serialize object of type 'org.gradle.api.DefaultTask'")
            totalProblemsCount = 1
            problemsWithStackTraceCount = 0
        }
    }

    def "restores task fields whose value is an object graph with cycles"() {

        given:
        buildFile << """
            class Param<T> {
                T display
                String toString() { display.toString() }
            }

            abstract class MyTask extends DefaultTask {
                @Input
                abstract Property<$type> getProp()

                @TaskAction
                void go() {
                    println("prop = \${prop.get()}")
                }

// Accessing a provider
println(simpleMessageProvider.get())
// end::set-prov[]

// tag::introduction[]
abstract class MyIntroTask extends DefaultTask {
    @Input
    abstract Property<String> getConfiguration()

    @TaskAction
    void printConfiguration() {
        println "Configuration value: ${configuration.get()}"
    }
}

import org.gradle.api.DefaultTask;
import org.gradle.api.provider.Property;
import org.gradle.api.tasks.Input;
import org.gradle.api.tasks.TaskAction;

import java.net.URI;

// tag::download[]
public abstract class Download extends DefaultTask {
    @Input
    public abstract Property<URI> getUri(); // abstract getter of type Property<T>

    @TaskAction
    void run() {

== Task implementation by extending `DefaultTask`

To address more individual needs, and if no existing plugins provide the build functionality you need, you can create your own task implementation.

Implementing a class means creating a custom class (i.e., _type_), which is done by subclassing link:{javadocPath}/org/gradle/api/DefaultTask.html[`DefaultTask`]

        file("buildSrc/src/main/java/SomeTask.java") << """
import org.gradle.api.DefaultTask;
import org.gradle.api.tasks.TaskAction;
import org.gradle.api.tasks.Input;
import org.gradle.api.tasks.OutputDirectory;
import org.gradle.api.tasks.Optional;
import java.io.File;

public class SomeTask extends DefaultTask {
    private $type v;
    @Input
    public $type getV() { return v; }