content: package market;
  
  import com.zaxxer.hikari.HikariDataSource;
  import org.springframework.boot.autoconfigure.domain.EntityScan;
  import org.springframework.boot.autoconfigure.jdbc.DataSourceProperties;
  import org.springframework.boot.context.properties.ConfigurationProperties;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.ComponentScan;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.context.annotation.Primary;
  import org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor;
  import org.springframework.orm.jpa.JpaTransactionManager;
  import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
  import org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter;
  import org.springframework.transaction.PlatformTransactionManager;
  import org.springframework.transaction.annotation.EnableTransactionManagement;
  
  import javax.persistence.EntityManagerFactory;
  import javax.sql.DataSource;
  
  @Configuration
  @EntityScan(basePackages="market.domain")
  @EnableTransactionManagement
  @ComponentScan(basePackages = {
  	"market.properties",
  	"market.service"
  })
  public class DataConfig {
  
  	@Bean
  	@Primary
  	@ConfigurationProperties("spring.datasource")
  	public DataSourceProperties dataSourceProperties() {
  		return new DataSourceProperties();
  	}
  
  	@Bean // with Spring Boot this is actually not necessary but leaving it to note things explicitly
  	@Primary
  	@ConfigurationProperties("spring.datasource.configuration")
  	public HikariDataSource dataSource() {
  		DataSourceProperties properties = dataSourceProperties();
  		return properties.initializeDataSourceBuilder().type(HikariDataSource.class).build();
  	}
  
  	@Bean
  	public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {
  		LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean(); // todo: EntityManagerFactoryBuilder ?
  		em.setDataSource(dataSource);
  		em.setPackagesToScan("market.domain");
  		em.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
  		return em;
  	}
  
  	@Bean
  	public PlatformTransactionManager transactionManager(EntityManagerFactory emf) {
  		JpaTransactionManager transactionManager = new JpaTransactionManager();
  		transactionManager.setEntityManagerFactory(emf);
  		return transactionManager;
  	}
  
  	@Bean
  	public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
  		return new PersistenceExceptionTranslationPostProcessor();
  	}
  }
  