Spring MVC
WebRootConfig Class @Configuration @EnableTransactionManagement @PropertySource ( "classpath:application.properties" ) public class WebRootConfig { @Autowired private Environment env ; @Bean public LocalContainerEntityManagerFactoryBean entityManagerFactory (DataSource ds , JpaVendorAdapter jpaVendorAdapter){ LocalContainerEntityManagerFactoryBean emfb = new LocalContainerEntityManagerFactoryBean() ; emfb.setDataSource(ds) ; emfb.setJpaVendorAdapter(jpaVendorAdapter) ; emfb.setPackagesToScan( "lk.ijse.hotelbackend.entity" ) ; return emfb ; } @Bean public DataSource dataSource (){ DriverManagerDataSource ds = new DriverManagerDataSource() ; ds.setDriverClassName( env .getRequiredProperty( "javax.persistence.jdbc.driver" )) ; ds.setUrl( env .getRequiredProperty( "javax.persistence.jdbc.url" )) ; ds.setUsername( env .getRequiredProperty( ...