"""
        file("buildSrc/src/main/java/CustomTask.java") << """
            import org.gradle.api.GradleException;
            import org.gradle.api.tasks.TaskAction;

            public class CustomTask extends AbstractCustomTask {
                @TaskAction
                public void checkFiles() {
                    System.out.println("checking files");
                    if (getSourceFiles().isEmpty()) {

 * limitations under the License.
 */

package org.gradle.api.file

import org.gradle.api.DefaultTask
import org.gradle.api.tasks.Nested
import org.gradle.api.tasks.OutputFile
import org.gradle.api.tasks.TaskAction

import java.nio.file.Files

class FilePropertyJavaInterOpIntegrationTest extends AbstractFilePropertyJavaInterOpIntegrationTest {
    @Override
    void taskDefinition() {

                @TaskAction void foo() {
                    def dir = outDir.get().asFile
                    assert new File(dir, 'baz').createNewFile()
                }
            }
            abstract class Bar extends DefaultTask {
                @InputFile abstract RegularFileProperty getInDir()
                @TaskAction void bar() {}
            }

            import ${RegularFileProperty.name}
            import ${TaskAction.name}
            import ${OutputFile.name}

            open class ProducerTask: DefaultTask() {
                @OutputFile
                val outFile: RegularFileProperty = project.objects.fileProperty()

                @TaskAction
                fun run() {
                    outFile.get().asFile.writeText("content")

import org.gradle.api.Project
import org.gradle.api.file.FileSystemOperations
import org.gradle.api.provider.ProviderFactory
import org.gradle.api.DefaultTask
import org.gradle.api.tasks.Input
import org.gradle.api.tasks.TaskAction
import org.gradle.workers.WorkAction
import org.gradle.workers.WorkParameters
import org.gradle.workers.WorkerExecutor
import org.gradle.tooling.provider.model.ToolingModelBuilder

            import ${TaskAction.name};
            import ${OutputFile.name};
            import ${Files.name};
            import ${IOException.name};

            public abstract class ProducerTask extends DefaultTask {
                @OutputFile
                public abstract RegularFileProperty getOutFile();

                @TaskAction
                public void run() throws IOException {

import org.gradle.api.tasks.Input
import org.gradle.api.tasks.TaskAction
import org.gradle.workers.WorkAction
import org.gradle.workers.WorkParameters
import org.gradle.workers.WorkerExecutor
import org.gradle.tooling.provider.model.ToolingModelBuilderRegistry
import org.gradle.tooling.provider.model.ToolingModelBuilder

plugins {
    id 'groovy'
}

repositories {
    mavenCentral()
}

// tag::object-factory[]

To create a task, inherit from the `DefaultTask` class and implement a link:{javadocPath}/org/gradle/api/tasks/TaskAction.html[`@TaskAction`] handler:

.build.gradle.kts
[source,kotlin]
----
abstract class CreateFileTask : DefaultTask() {
    @TaskAction
    fun action() {
        val file = File("myfile.txt")
        file.createNewFile()
        file.writeText("HELLO FROM MY TASK")
    }
}

        buildFile << """
            class MyTask extends DefaultTask {
                @Output${files ? "Files" : "Directories"} FileCollection out

                @TaskAction def exec() {
                    out.each { it${files ? ".text = 'data' + it.name" : ".mkdirs(); new File(it, 'contents').text = 'data' + it.name"} }
                }
            }

            task myTask(type: MyTask) {

        buildFile << """
            abstract class SomeTask extends DefaultTask {
                ${annotation}
                ${propertyImpl}

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

            task show(type: SomeTask) {
                def layout = project.layout