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Create new exercise "Hello JPA Repository"
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‎hello-jpa-repository/README.MD‎

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# <img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=50/>Hello JpaRepository exercise :muscle:
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Improve your *Spring Data JPA* Java configuration skills
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### Task
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The task is to **configure Spring Data JPA repository** for `User`. In order to do that you need to **configure
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`EntityManagerFactory`**, **enable transaction management** and **create a JPA repository**. Please follow
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the instruction in the *todo* sections.
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To verify your configuration, run `SpringDataJpaConfigTest.java`
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### Pre-conditions :heavy_exclamation_mark:
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You're supposed to be familiar with *Spring IoC* and *Dependency injection*
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### How to start :question:
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* Just clone the repository and start implementing the **todo** section, verify your changes by running tests
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* If you don't have enough knowledge about this domain, check out the [links below](#related-materials-information_source)
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* Don't worry if you got stuck, checkout the **exercise/completed** branch and see the final implementation
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### Related materials :information_source:
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* [Spring Data JPA basics tutorial](https://github.com/bobocode-projects/spring-data-jpa-tutorial/tree/master/jpa-repository-basics)<img src="https://raw.githubusercontent.com/bobocode-projects/resources/master/image/logo_transparent_background.png" height=20/>
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‎hello-jpa-repository/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<parent>
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<artifactId>spring-data-jpa-exercises</artifactId>
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<groupId>com.bobocode</groupId>
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<version>1.0-SNAPSHOT</version>
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</parent>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>hello-jpa-repository</artifactId>
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<dependencies>
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<dependency>
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<groupId>com.bobocode</groupId>
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<artifactId>spring-data-jpa-exercises-util</artifactId>
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<version>1.0-SNAPSHOT</version>
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</dependency>
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</dependencies>
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</project>

‎hello-jpa-repository/src/main/java/com/bobocode/config/JpaConfig.java‎

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package com.bobocode.config;
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import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
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import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
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import org.springframework.orm.jpa.JpaVendorAdapter;
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import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
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import javax.sql.DataSource;
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/**
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* This class provides spring configuration for {@link javax.persistence.EntityManagerFactory} bean.
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* <p>
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* todo: 1. PLEASE NOTE, THAT SOME REQUIRED STEPS ARE OMITTED IN THE TODO LIST AND YOU HAVE TO DO IT ON YOUR OWN
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* <p>
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* todo: 2. Configure {@link DataSource} bean
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* todo: 3. Configure {@link JpaVendorAdapter} bean
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* todo: 3. Configure {@link javax.persistence.EntityManagerFactory} bean with name "entityManagerFactory"
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* todo: 4. Enable JPA repository, set appropriate package using annotation property "basePackages"
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*/
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public class JpaConfig {
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public DataSource dataSource() {
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return new EmbeddedDatabaseBuilder()
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.setType(EmbeddedDatabaseType.H2)
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.build();
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}
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public JpaVendorAdapter jpaVendorAdapter() {
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// todo: create HibernateJpaVendorAdapter
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// todo: set H2 database
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// todo: enable DDL generation
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throw new UnsupportedOperationException("Application won't start until you provide configs");
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}
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public LocalContainerEntityManagerFactoryBean localContainerEMF() {
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// todo: create and configure required bean
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// todo: set package "com.bobocode.model" to scan for JPA entities
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throw new UnsupportedOperationException("Application won't start until you provide configs");
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}
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}

‎hello-jpa-repository/src/main/java/com/bobocode/config/RootConfig.java‎

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package com.bobocode.config;
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import org.springframework.transaction.PlatformTransactionManager;
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/**
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* This class is provides root Java config for Spring application.
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* <p>
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* todo: 1. PLEASE NOTE, THAT SOME REQUIRED STEPS ARE OMITTED IN THE TODO LIST AND YOU HAVE TO DO IT ON YOUR OWN
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* <p>
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* todo: 2. Configure {@link PlatformTransactionManager} bean with name "transactionManager"
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* todo: 3. Enable transaction management
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*/
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public class RootConfig {
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}
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‎hello-jpa-repository/src/main/java/com/bobocode/dao/UserRepository.java‎

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package com.bobocode.dao;
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import com.bobocode.model.User;
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import org.springframework.data.jpa.repository.JpaRepository;
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/**
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* This interface represents a data access object (DAO) for {@link User}.
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* <p>
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* todo: 1. Configure {@link UserRepository} as {@link JpaRepository} for class User
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*/
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public interface UserRepository extends JpaRepository {
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}

‎hello-jpa-repository/src/test/java/com/bobocode/SpringDataJpaConfigTest.java‎

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package com.bobocode;
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import com.bobocode.config.JpaConfig;
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import com.bobocode.config.RootConfig;
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import com.bobocode.dao.UserRepository;
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import com.bobocode.model.User;
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import com.bobocode.util.TestDataGenerator;
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import org.junit.jupiter.api.Test;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.context.ApplicationContext;
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import org.springframework.context.annotation.Bean;
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import org.springframework.context.annotation.ComponentScan;
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import org.springframework.context.annotation.Configuration;
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import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
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import org.springframework.stereotype.Repository;
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import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
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import org.springframework.transaction.PlatformTransactionManager;
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import org.springframework.transaction.annotation.Transactional;
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import javax.persistence.EntityManagerFactory;
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import java.util.List;
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import java.util.stream.Stream;
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import static org.hamcrest.MatcherAssert.assertThat;
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import static org.hamcrest.Matchers.*;
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import static org.hamcrest.core.IsNull.notNullValue;
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@SpringJUnitConfig(RootConfig.class)
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@Transactional
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public class SpringDataJpaConfigTest {
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@Configuration
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static class TestConfig {
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@Bean
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TestDataGenerator dataGenerator() {
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return new TestDataGenerator();
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}
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}
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@Autowired
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private ApplicationContext applicationContext;
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@Autowired
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private UserRepository userRepository;
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@Autowired
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private TestDataGenerator dataGenerator;
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@Test
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public void testTxManagerBeanName() {
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PlatformTransactionManager transactionManager = applicationContext.getBean(PlatformTransactionManager.class, "transactionManager");
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assertThat(transactionManager, notNullValue());
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}
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@Test
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public void testUserRepositoryBeanName() {
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UserRepository userRepository = applicationContext.getBean(UserRepository.class, "userRepository");
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assertThat(userRepository, notNullValue());
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}
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@Test
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public void testEntityManagerFactoryBeanName() {
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EntityManagerFactory entityManagerFactory = applicationContext.getBean(EntityManagerFactory.class, "entityManagerFactory");
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assertThat(entityManagerFactory, notNullValue());
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}
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@Test
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public void testUserRepositoryIsNotMarkedAsRepository() {
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Repository repository = UserRepository.class.getAnnotation(Repository.class);
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assertThat(repository, nullValue());
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}
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@Test
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public void testRootConfigComponentScan() {
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ComponentScan componentScan = RootConfig.class.getAnnotation(ComponentScan.class);
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String[] basePackages = componentScan.basePackages();
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if (basePackages.length == 0) {
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basePackages = componentScan.value();
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}
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assertThat(basePackages, array(equalTo("com.bobocode")));
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}
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@Test
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public void testJpaConfigRepositoriesPackage() {
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EnableJpaRepositories enableJpaRepositories = JpaConfig.class.getAnnotation(EnableJpaRepositories.class);
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assertThat(enableJpaRepositories.basePackages(), array(equalTo("com.bobocode.dao")));
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}
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@Test
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public void testSaveUser() {
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User user = dataGenerator.generateUser();
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userRepository.save(user);
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assertThat(user.getId(), notNullValue());
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}
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@Test
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public void testFindAll() {
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Stream.generate(dataGenerator::generateUser).limit(10).forEach(userRepository::save);
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List<User> users = userRepository.findAll();
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assertThat(users.size(), is(10));
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}
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}

‎pom.xml‎

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<modules>
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<module>spring-data-jpa-exercises-model</module>
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<module>spring-data-jpa-exercises-util</module>
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<module>hello-jpa-repository</module>
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</modules>
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<packaging>pom</packaging>
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<artifactId>spring-data-jpa</artifactId>
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<version>2.1.0.RELEASE</version>
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</dependency>
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<dependency>
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<groupId>org.springframework</groupId>
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<artifactId>spring-test</artifactId>
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<version>5.0.7.RELEASE</version>
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</dependency>
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<dependency>
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<groupId>com.h2database</groupId>
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<artifactId>h2</artifactId>
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<artifactId>hibernate-core</artifactId>
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<version>5.3.2.Final</version>
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</dependency>
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<dependency>
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<groupId>org.junit.jupiter</groupId>
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<artifactId>junit-jupiter-engine</artifactId>
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<version>5.2.0</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.junit.platform</groupId>
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<artifactId>junit-platform-launcher</artifactId>
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<version>1.3.1</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.hamcrest</groupId>
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<artifactId>hamcrest-all</artifactId>
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<version>1.3</version>
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<scope>test</scope>
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</dependency>
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<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
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<dependency>
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<groupId>org.projectlombok</groupId>

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