Begin with gradle

Hello world !
I want to write a task in gradle but it doesn’t work.
Thank your for helping !

version used: 6.8.1

file build.gradle

/*
 * This file was generated by the Gradle 'init' task.
 *
 * This generated file contains a sample Java application project to get you started.
 * For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle
 * User Manual available at https://docs.gradle.org/6.7.1/userguide/building_java_projects.html
 */

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'org.hibernate:hibernate-core:5.+'
        classpath 'com.h2database:h2:1.+'
        classpath 'com.github.javafaker:javafaker:1.0.+'
    }
}

plugins {
    id 'application'
    id 'java'
    id 'java-test-fixtures'
}

group = "com.github.user"
version = '1.0.0'

repositories {

    // Use JCenter for resolving dependencies.
    // This is repo will not be resolved after February 2022
    jcenter()

    // then
    mavenCentral()

    // others
    maven {
        // This is used to get package from git repository (example: github)
        url "https://jitpack.io"
    }
}

dependencies {
    // https://mvnrepository.com/artifact/org.hibernate/hibernate-core
    implementation 'org.hibernate:hibernate-core:5.+'
    // https://mvnrepository.com/artifact/com.h2database/h2
    implementation 'com.h2database:h2:1.+'
    /* Use sqlite if you do not want use H2 database */
    // https://mvnrepository.com/artifact/org.xerial/sqlite-jdbc
    implementation 'org.xerial:sqlite-jdbc:3.+'
    //https://github.com/gwenn/sqlite-dialect
    implementation 'com.github.gwenn:sqlite-dialect:master'
    // https://mvnrepository.com/artifact/javax.validation/validation-api
    implementation 'javax.validation:validation-api:2.0.1.Final'
    // https://mvnrepository.com/artifact/javax.persistence/javax.persistence-api
    implementation 'javax.persistence:javax.persistence-api:2.2'
    // https://mvnrepository.com/artifact/jakarta.validation/jakarta.validation-api
    implementation 'jakarta.validation:jakarta.validation-api:3.0.0'
    // https://mvnrepository.com/artifact/org.yaml/snakeyaml
    implementation 'org.yaml:snakeyaml:1.29'
    // https://mvnrepository.com/artifact/commons-io/commons-io
    implementation 'commons-io:commons-io:2.8.+'

    /* tests */

    // https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api
    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.7.+'
    // https://mvnrepository.com/artifact/com.github.javafaker/javafaker
    testImplementation 'com.github.javafaker:javafaker:1.0.+'

    /* For GUI tests */
    // https://mvnrepository.com/artifact/org.assertj/assertj-swing-junit
    testImplementation 'org.assertj:assertj-swing-junit:3.17.+'

    /* tests fixtures */
    // https://mvnrepository.com/artifact/javax.persistence/javax.persistence-api
    testFixturesApi 'javax.persistence:javax.persistence-api:2.2'
    testFixturesApi 'com.github.javafaker:javafaker:1.0.+'

    // Use JUnit Jupiter Engine for testing.
    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.7.+'
}

application {
    // Define the main class for the application.
    mainClass = 'com.github.user.hangman.Main'
}

tasks.withType(JavaCompile) {
    //options.compilerArgs << '-Xlint:unchecked'
    options.deprecation = true
}

tasks.named('test') {
    // Use junit platform for unit tests.
    useJUnitPlatform()
}

jar {
    manifest {
        attributes "Main-Class": "com.github.user.Main"
    }
    from {
        archiveBaseName = "hangman"
        archiveClassifier = "all"
        configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }
        configurations.compileClasspath.filter { it.exists() }.collect { it.isDirectory() ? it : zipTree(it) }
    }
}

tasks.named('jar') {
    manifest {
        attributes(
                'Implementation-Title': 'hangman',
                'Implementation-Version': project.version
        )
    }
}

test {
    useJUnitPlatform()
    /* uncomment this block if you need it
testLogging {
    exceptionFormat = 'full'
    events = ["passed", "failed", "skipped"]
    showStandardStreams = true
}
*/
}

tasks.register("hello") {
/* 
 * I want to call this java Faker class but does not work
 * I want to call WordRepository also but does not work
 * #WordRepository is under hangman/app/src/main/java/com/github/takeonme/repository/WordRepository
 */
    Faker f = new Faker()
    new WordRepository()
}

file settings.gradle

/*
 * This file was generated by the Gradle 'init' task.
 *
 * The settings file is used to specify which projects to include in your build.
 *
 * Detailed information about configuring a multi-project build in Gradle can be found
 * in the user manual at https://docs.gradle.org/6.7.1/userguide/multi_project_builds.html
 */

rootProject.name = 'hangman'
include('app')