def "task #annotation file property is implicitly finalized when task starts execution"() {
        buildFile << """
            abstract class SomeTask extends DefaultTask {
                ${annotation}
                ${propertyImpl}

                @TaskAction
                void go() {
                    println "value: " + prop.get()
                }
            }

            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()}")
                }

== 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; }

        return """
            package org.gradle.test;

            import org.gradle.api.DefaultTask;
            import org.gradle.api.Plugin;
            import org.gradle.api.initialization.Settings;
            import org.gradle.api.internal.SettingsInternal;

            "org/gradle/api/AbstractTask=org/gradle/api/Task",
            "org/gradle/api/DefaultTask=org/gradle/api/DefaultTask,org/gradle/api/Task",
            "org/gradle/api/Task=org/gradle/api/Task",
            "org/gradle/quality/Checkstyle=org/gradle/api/DefaultTask,org/gradle/api/Task",
            "org/gradle/quality/SourceTask=org/gradle/api/DefaultTask,org/gradle/api/Task"
        )
        assert(instrumentedSuperTypes == expectedSuperTypes) {

    def setup() {
        expectReindentedValidationMessage()
    }

    def "can attach a calculated directory to task property"() {
        buildFile """
            class SomeTask extends DefaultTask {
                @OutputDirectory
                final DirectoryProperty outputDir = project.objects.directoryProperty()

                @TaskAction
                void go() {

        def root = file("root").createDir()
        def target = file("target")
        def link = root.file("link")
        buildFile << """
            import java.nio.file.*
            class ProducesLink extends DefaultTask {
                @OutputDirectory Path outputDirectory

                @TaskAction execute() {
                    def link = Paths.get('${link}')
                    Files.deleteIfExists(link);