CODEWITHSUNDEEP
springhibernatejpaspring-boot
glhr
glhr

Reputation: 417

Spring Boot - using JPA Repositories with Hibernate

I have a simple Spring Boot application with the following auto-configuration properties:

spring.datasource.driver-class-name=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://localhost:5432/mywebapp
spring.datasource.username=username
spring.datasource.password=password
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
spring.jpa.hibernate.ddl-auto=validate

These work fine and I'm able to setup Spring Data JpaRepositories:

public interface UserRepository extends JpaRepository<User, String>
{
    User findByName(String name);
}

...for the following entities: 

@Entity
public class User
{
    @Id
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid", strategy = "uuid2")
    protected String uuid;

    @Column(nullable = false)
    private String name;

    @Column(nullable = false)
    private String password;

    @Column(nullable = false)
    private String email;
}

...and use them like this:

@Transactional
public void updatePassword(String username, String password)
{
    User user = userRepository.findByName(username);
    user.setEmail("[email protected]"); // This gets persisted automatically by the JpaRepository.
}

Now I'm struggling to configure the same thing manually. I've tried the following:

@Configuration
@EnableTransactionManagement
public class PersistenceConfig
{
    @Bean
    public DataSource dataSource()
    {
        DataSource dataSource = new DataSource();
        dataSource.setDriverClassName("org.postgresql.Driver");
        dataSource.setUrl("jdbc:postgresql://localhost:5432/mywebapp");
        dataSource.setUsername("username");
        dataSource.setPassword("password");

        return dataSource;
    }

    @Bean
    public LocalSessionFactoryBean sessionFactory()
    {
        LocalSessionFactoryBean sessionFactoryBean = new LocalSessionFactoryBean();
        sessionFactoryBean.setDataSource(dataSource());
        sessionFactoryBean.setPackagesToScan("com.example.persistent");

        Properties hibernateProperties = new Properties();
        hibernateProperties.setProperty("hibernate.dialect", "org.hibernate.dialect.PostgreSQLDialect");
        hibernateProperties.setProperty("hibernate.hbm2ddl.auto", "validate");
        sessionFactoryBean.setHibernateProperties(hibernateProperties);

        return sessionFactoryBean;
    }

    @Bean
    public HibernateTransactionManager transactionManager()
    {
        HibernateTransactionManager transactionManager = new HibernateTransactionManager();
        transactionManager.setSessionFactory(sessionFactory().getObject());
        return transactionManager;
    }

}

...but while no exceptions are thrown and i can now successfully read from the database, it seems that none of the changes I make to the entities are being persisted.

Does anyone have an idea what I'm missing for the persistence to work?

Upvotes: 3

Views: 2374

Answers (1)

glhr
glhr

Reputation: 417

OP here.

I seem to have misunderstood that JPA needs an EntityManager instead of a session.

The following configuration works:

@Configuration
@EnableTransactionManagement
public class PersistenceJpaConfig
{
    @Bean
    public DataSource dataSource()
    {
        DataSource dataSource = new DataSource();
        dataSource.setDriverClassName("org.postgresql.Driver");
        dataSource.setUrl("jdbc:postgresql://localhost:5432/mywebapp");
        dataSource.setUsername("username");
        dataSource.setPassword("password");

        return dataSource;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean entityManagerFactory()
    {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(dataSource());
        em.setPackagesToScan("com.example.persistent");

        JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter(vendorAdapter);

        Properties properties = new Properties();
        properties.setProperty("hibernate.dialect", "org.hibernate.dialect.PostgreSQLDialect");
        properties.setProperty("hibernate.hbm2ddl.auto", "validate");
        em.setJpaProperties(properties);

        return em;
    }

    @Bean
    public PlatformTransactionManager transactionManager(EntityManagerFactory emf)
    {
        JpaTransactionManager transactionManager = new JpaTransactionManager();
        transactionManager.setEntityManagerFactory(emf);

        return transactionManager;
    }

    @Bean
    public PersistenceExceptionTranslationPostProcessor exceptionTranslation()
    {
        return new PersistenceExceptionTranslationPostProcessor();
    }

}

Upvotes: 2

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