persistence.xml using java configuration

Question

Why is persistence.xml file needed:

@Configuration
@EnableTransactionManagement
@ComponentScan(basePackages="es.japanathome")
public class DataAccessConfig
{

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

@Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory()
{
    LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();

    HibernateJpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
    vendorAdapter.setGenerateDdl(Boolean.TRUE);
    vendorAdapter.setShowSql(Boolean.TRUE);

    factory.setJpaVendorAdapter( vendorAdapter );
    factory.setDataSource( dataSource() );
    factory.setPackagesToScan("es.japanathome.domain");
    factory.setLoadTimeWeaver(new InstrumentationLoadTimeWeaver());
    return factory;
}

Spring knows where can find my entities, so I don't understand why is still needed this file.

persistence.xml is used to define the persistence-unit and also the classes that will be used by this persistence. — fmodos
– fmodos, Commented May 27, 2014 at 19:34

ikumen · Accepted Answer · 2014-05-27 19:49:34Z

3

Depending on which Spring version you use, you may not need to provide a persistence.xml.

Since Spring 3.1, persistence.xml is no longer explicitly required when you're using LocalContainerEntityManagerFactoryBean. Basically packagesToScan was added allowing a way for Spring to find @Entity classes.

answered May 27, 2014 at 19:49

ikumen

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