Spring Application and Hibernate Application without XML configuration - spring

Question

Recently in a interview, It was asked from me that is it possible to have Spring Application or Hibernate Application without XML configuration..?
So what could be the best answer of it, Please explain.

Answer 1

Yes you can, e.g:-> Account
#Entity
public class Account {
#Id
#GeneratedValue
private Long id;
#Temporal(TemporalType.DATE)
private Data data;
private Long accountNumber;
private String owner;
private double balance;
public Long getAccountNumber() {
return accountNumber;
}
public void setAccountNumber(Long accountNumber) {
this.accountNumber = accountNumber;
}
public String getOwner() {
return owner;
}
public void setOwner(String owner) {
this.owner = owner;
}
public double getBalance() {
return balance;
}
public void setBalance(double balance) {
this.balance = balance;
}
#Override
public String toString() {
return "Account{" +
"accountNumber=" + accountNumber +
", owner='" + owner + '\'' +
", balance=" + balance +
'}';
}
}
Dao:
#Repository
public class AccountDao {
#PersistenceContext
EntityManager entityManager;
#Transactional
public void save(Account account) {
entityManager.persist(account);
}
protected Account getByKey(Long key) {
return (Account) entityManager.find(Account.class, key);
}
}
Configuration->
#Configuration
#EnableTransactionManagement
#ComponentScan("your scan package path")
public class AppConfig {
#Bean
public DataSource dataSource() {
DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
driverManagerDataSource.setUsername("root");
driverManagerDataSource.setUrl("jdbc:mysql://localhost:3306/your_data_base_name");
driverManagerDataSource.setDriverClassName("com.mysql.jdbc.Driver");
driverManagerDataSource.setPassword("password");
return driverManagerDataSource;
}
#Bean
public LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBean = new LocalContainerEntityManagerFactoryBean();
localContainerEntityManagerFactoryBean.setDataSource(dataSource());
localContainerEntityManagerFactoryBean.setJpaVendorAdapter(getHibernateJpaVendorAdapter());
localContainerEntityManagerFactoryBean.setJpaProperties(additionalProperties());
localContainerEntityManagerFactoryBean.setPackagesToScan("entity_package_name");
return localContainerEntityManagerFactoryBean;
}
#Bean
public JpaVendorAdapter getHibernateJpaVendorAdapter() {
HibernateJpaVendorAdapter hibernateJpaVendorAdapter = new HibernateJpaVendorAdapter();
hibernateJpaVendorAdapter.setShowSql(true);
hibernateJpaVendorAdapter.setGenerateDdl(true);
return hibernateJpaVendorAdapter;
}
#Bean
public PlatformTransactionManager transactionManager(EntityManagerFactory emf) {
return new JpaTransactionManager(entityManagerFactory().getObject());
}
#Bean
public PersistenceExceptionTranslationPostProcessor exceptionTranslation() {
return new PersistenceExceptionTranslationPostProcessor();
}
Properties additionalProperties() {
Properties properties = new Properties();
properties.put("hibernate.dialect", "org.hibernate.dialect.MySQL5Dialect");
properties.put("hibernate.hbm2ddl.auto", "create");
properties.put("hibernate_show_sql", true);
return properties;
}
}
Test class :
public class Test {
public static void main(String[] args) {
ApplicationContext applicationContext = new AnnotationConfigApplicationContext(AppConfig.class);
Account account = new Account();
account.setAccountNumber(123L);
account.setBalance(100056.5);
AccountService accountService = applicationContext.getBean(AccountService.class);
accountService.save(account);
}
}