Java Configuration Deep Dive with Spring
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The document outlines a presentation by Josh Long about configuring Java applications using Spring, focusing on database access with Hibernate and RESTful endpoint creation. It includes code snippets illustrating the use of Spring annotations, service configuration, and dependency injection. Various approaches to application context and transaction management are discussed, providing developers with practical examples for building robust applications.
![The Spring ApplicationContext
From XML:
public class Main {
public static void main(String [] args) throws Throwable {
ApplicationContext ctx =
new ClassPathXmlApplication( “my-config.xml” );
CustomerService serviceReference = ctx.getBean( CustomerService.class );
Customer customer = serviceReference.createCustomer( "Juergen", "Hoeller");
}
}
From Java Configuration
public class Main {
public static void main(String [] args) throws Throwable {
ApplicationContext ctx =
new AnnotationConfigApplicationContext( ServicesConfiguration.class );
CustomerService serviceReference = ctx.getBean( CustomerService.class );
Customer customer = serviceReference.createCustomer( "Juergen", "Hoeller");
}
}
10](https://image.slidesharecdn.com/javaconfigdeepdive-131119005642-phpapp02/85/Java-Configuration-Deep-Dive-with-Spring-10-320.jpg)
Java Configuration Deep Dive with Spring
- 1. Josh Long (⻰龙之春) @starbuxman joshlong.com [email protected] slideshare.net/joshlong github.com/joshlong http://spring.io J AVA C O N F I G U R AT I O N D E E P D I V E WITH
- 2. REST DESIGN WITH SPRING About Josh Long (⻰龙之春) Spring Developer Advocate @starbuxman Jean Claude van Damme! | [email protected] Java mascot Duke some thing’s I’ve authored...
- 3. It’s Easy to Use Spring’s Annotations in Your Code Not confidential. Tell everyone. 3
- 4. I want Database Access ... with Hibernate 4 Support @Service public class CustomerService { public Customer getCustomerById( long customerId) ... } { public Customer createCustomer( String firstName, String lastName, Date date){ ... } } Not confidential. Tell everyone. 4
- 5. I want Database Access ... with Hibernate 4 Support @Service public class CustomerService { @Inject // JSR 330 private SessionFactory sessionFactory; public Customer createCustomer(String firstName, String lastName, Date signupDate) { Customer customer = new Customer(); customer.setFirstName(firstName); customer.setLastName(lastName); customer.setSignupDate(signupDate); sessionFactory.getCurrentSession().save(customer); return customer; } } Not confidential. Tell everyone. 5
- 6. I want Database Access ... with Hibernate 4 Support @Service public class CustomerService { @Inject private SessionFactory sessionFactory; @Transactional public Customer createCustomer(String firstName, String lastName, Date signupDate) { Customer customer = new Customer(); customer.setFirstName(firstName); customer.setLastName(lastName); customer.setSignupDate(signupDate); sessionFactory.getCurrentSession().save(customer); return customer; } } Not confidential. Tell everyone. 6
- 7. I want Declarative Cache Management... @Service public class CustomerService { @Inject private SessionFactory sessionFactory; @Transactional(readOnly = true) @Cacheable(“customers”) public Customer getCustomerById( long customerId) ... } { ... } Not confidential. Tell everyone. 7
- 8. I want a RESTful Endpoint... package org.springsource.examples.spring31.web; .. @RestController class CustomerController { @Inject CustomerService customerService; @RequestMapping(value = "/customer/{id}" ) Customer customerById( @PathVariable Integer id ) { return customerService.getCustomerById(id); } ... } Not confidential. Tell everyone. 8
- 9. ...But Where’d the SessionFactory come from? Not confidential. Tell everyone. 9
- 10. The Spring ApplicationContext From XML: public class Main { public static void main(String [] args) throws Throwable { ApplicationContext ctx = new ClassPathXmlApplication( “my-config.xml” ); CustomerService serviceReference = ctx.getBean( CustomerService.class ); Customer customer = serviceReference.createCustomer( "Juergen", "Hoeller"); } } From Java Configuration public class Main { public static void main(String [] args) throws Throwable { ApplicationContext ctx = new AnnotationConfigApplicationContext( ServicesConfiguration.class ); CustomerService serviceReference = ctx.getBean( CustomerService.class ); Customer customer = serviceReference.createCustomer( "Juergen", "Hoeller"); } } 10
- 11. A Quick Primer on Configuration .... <beans> <tx:annotation-driven transaction-manager = "txManager" /> <context:component-scan base-package = "org.springsource.examples.spring31.services" /> <context:property-placeholder properties = "config.properties" /> <bean id = "txManager" class = "org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name = "sessionFactory" ref = "sessionFactory" /> </bean> <bean id = "sessionFactory" class = "org.springframework.orm.hibernate4.LocalSessionFactoryBean"> ... </bean> <bean id = "dataSource" class = "..SimpleDriverDataSource"> <property name= "userName" value = "${ds.user}"/> ... </bean> </beans> ApplicationContext ctx = new ClassPathXmlApplication( “service-config.xml” ); Not confidential. Tell everyone.
- 12. A Quick Primer on Configuration .... <beans> <tx:annotation-driven transaction-manager = "txManager" /> <context:component-scan base-package = "org.springsource.examples.spring31.services" /> <context:property-placeholder properties = "config.properties" /> <bean id = "txManager" class = "org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name = "sessionFactory" ref = "sessionFactory" /> </bean> <bean id = "sessionFactory" class = "org.springframework.orm.hibernate4.LocalSessionFactoryBean"> ... </bean> <bean id = "dataSource" class = "..SimpleDriverDataSource"> <property name= "userName" value = "${ds.user}"/> ... </bean> </beans> ApplicationContext ctx = new ClassPathXmlApplication( “service-config.xml” ); Not confidential. Tell everyone.
- 13. A Quick Primer on Configuration @Configuration @PropertySource("/config.properties") @EnableTransactionManagement @ComponentScan(basePackageClasses = {CustomerService.class}) public class ServicesConfiguration { @Inject private Environment environment; @Bean public PlatformTransactionManager txManager() throws Exception { return new HibernateTransactionManager(this.sessionFactory()); } @Bean public SessionFactory sessionFactory() { ... } @Bean public DataSource dataSource(){ SimpleDriverDataSource sds = new SimpleDriverDataSource(); sds.setUserName( this.environment.getProperty( “ds.user”)); // ... return sds; } } ApplicationContext ctx = new AnnotationConfigApplicationContext( ServicesConfiguration.class ); Not confidential. Tell everyone.
- 14. A Quick Primer on Configuration .... <beans> <tx:annotation-driven transaction-manager = "txManager" /> <context:component-scan base-package = "org.springsource.examples.spring31.services" /> <context:property-placeholder properties = "config.properties" /> <bean id = "txManager" class = "org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name = "sessionFactory" ref = "sessionFactory" /> </bean> <bean id = "sessionFactory" class = "org.springframework.orm.hibernate4.LocalSessionFactoryBean"> ... </bean> <bean id = "dataSource" class = "..SimpleDriverDataSource"> <property name= "userName" value = "${ds.user}"/> ... </bean> </beans> ApplicationContext ctx = new ClassPathXmlApplication( “service-config.xml” ); Not confidential. Tell everyone.
- 15. A Quick Primer on Configuration @Configuration @PropertySource("/config.properties") @EnableTransactionManagement @ComponentScan(basePackageClasses = {CustomerService.class}) public class ServicesConfiguration { @Inject private Environment environment; @Bean public PlatformTransactionManager txManager() throws Exception { return new HibernateTransactionManager(this.sessionFactory()); } @Bean public SessionFactory sessionFactory() { ... } @Bean public DataSource dataSource(){ SimpleDriverDataSource sds = new SimpleDriverDataSource(); sds.setUserName( this.environment.getProperty( “ds.user”)); // ... return sds; } } ApplicationContext ctx = new AnnotationConfigApplicationContext( ServicesConfiguration.class ); Not confidential. Tell everyone.
- 16. A Quick Primer on Configuration : Tangent on Injection @Configuration @PropertySource("/config.properties") @EnableTransactionManagement @ComponentScan(basePackageClasses = {CustomerService.class}) public class ServicesConfiguration { @Inject private Environment environment; @Bean public PlatformTransactionManager txManager() throws Exception { return new HibernateTransactionManager(this.sessionFactory()); } @Bean public SessionFactory sessionFactory() { ... } @Bean public DataSource dataSource(){ SimpleDriverDataSource sds = new SimpleDriverDataSource(); sds.setUserName( this.environment.getProperty( “ds.user”)); // ... return sds; } } ApplicationContext ctx = new AnnotationConfigApplicationContext( ServicesConfiguration.class ); Not confidential. Tell everyone.
- 17. A Quick Primer on Configuration : Tangent on Injection @Configuration @PropertySource("/config.properties") @EnableTransactionManagement @ComponentScan(basePackageClasses = {CustomerService.class}) public class ServicesConfiguration { @Inject private Environment environment; @Bean public PlatformTransactionManager txManager( SessionFactory sessionFactory ) throws Exception { return new HibernateTransactionManager( sessionFactory ); } @Bean public SessionFactory sessionFactory() { ... } @Bean public DataSource dataSource(){ SimpleDriverDataSource sds = new SimpleDriverDataSource(); sds.setUserName( this.environment.getProperty( “ds.user”)); // ... return sds; } } ApplicationContext ctx = new AnnotationConfigApplicationContext( ServicesConfiguration.class ); Not confidential. Tell everyone.
- 18. A Quick Primer on Configuration .... <beans> <tx:annotation-driven transaction-manager = "txManager" /> <context:component-scan base-package = "org.springsource.examples.spring31.services" /> <context:property-placeholder properties = "config.properties" /> <bean id = "txManager" class = "org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name = "sessionFactory" ref = "sessionFactory" /> </bean> <bean id = "sessionFactory" class = "org.springframework.orm.hibernate4.LocalSessionFactoryBean"> ... </bean> <bean id = "dataSource" class = "..SimpleDriverDataSource"> <property name= "userName" value = "${ds.user}"/> ... </bean> </beans> ApplicationContext ctx = new ClassPathXmlApplication( “service-config.xml” ); Not confidential. Tell everyone.
- 19. A Quick Primer on Configuration @Configuration @PropertySource("/config.properties") @EnableTransactionManagement @ComponentScan (basePackageClasses = {CustomerService.class}) public class ServicesConfiguration { @Inject private Environment environment; @Bean public PlatformTransactionManager txManager() throws Exception { return new HibernateTransactionManager(this.sessionFactory()); } @Bean public SessionFactory sessionFactory() { ... } @Bean public DataSource dataSource(){ SimpleDriverDataSource sds = new SimpleDriverDataSource(); sds.setUserName( this.environment.getProperty( “ds.user”)); // ... return sds; } } ApplicationContext ctx = new AnnotationConfigApplicationContext( ServicesConfiguration.class ); Not confidential. Tell everyone.
- 20. A Quick Primer on Configuration .... <beans> <tx:annotation-driven transaction-manager = "txManager" /> <context:component-scan base-package = "org.springsource.examples.spring31.services" /> <context:property-placeholder properties = "config.properties" /> <bean id = "txManager" class = "org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name = "sessionFactory" ref = "sessionFactory" /> </bean> <bean id = "sessionFactory" class = "org.springframework.orm.hibernate4.LocalSessionFactoryBean"> ... </bean> <bean id = "dataSource" class = "..SimpleDriverDataSource"> <property name= "userName" value = "${ds.user}"/> ... </bean> </beans> ApplicationContext ctx = new ClassPathXmlApplication( “service-config.xml” ); Not confidential. Tell everyone.
- 21. A Quick Primer on Configuration @Configuration @PropertySource("/config.properties") @EnableTransactionManagement @ComponentScan(basePackageClasses = {CustomerService.class}) public class ServicesConfiguration { @Inject private Environment environment; @Bean public PlatformTransactionManager txManager() throws Exception { return new HibernateTransactionManager(this.sessionFactory()); } @Bean public SessionFactory sessionFactory() { ... } @Bean public DataSource dataSource(){ SimpleDriverDataSource sds = new SimpleDriverDataSource(); sds.setUserName( this.environment.getProperty( “ds.user”)); // ... return sds; } } ApplicationContext ctx = new AnnotationConfigApplicationContext( ServicesConfiguration.class ); Not confidential. Tell everyone.
- 22. A Quick Primer on Configuration .... <beans> <tx:annotation-driven transaction-manager = "txManager" /> <context:component-scan base-package = "org.springsource.examples.spring31.services" /> <context:property-placeholder properties = "config.properties" /> <bean id = "txManager" class = "org.springframework.orm.hibernate4.HibernateTransactionManager"> <property name = "sessionFactory" ref = "sessionFactory" /> </bean> <bean id = "sessionFactory" class = "org.springframework.orm.hibernate4.LocalSessionFactoryBean"> ... </bean> <bean id = "dataSource" class = "..SimpleDriverDataSource"> <property name= "userName" value = "${ds.user}"/> ... </bean> </beans> ApplicationContext ctx = new ClassPathXmlApplication( “service-config.xml” ); Not confidential. Tell everyone.
- 23. A Quick Primer on Configuration @Configuration @PropertySource("/config.properties") @EnableTransactionManagement @ComponentScan(basePackageClasses = {CustomerService.class}) public class ServicesConfiguration { @Inject private Environment environment; @Bean public PlatformTransactionManager txManager() throws Exception { return new HibernateTransactionManager(this.sessionFactory()); } @Bean public SessionFactory sessionFactory() { ... } @Bean public DataSource dataSource(){ SimpleDriverDataSource sds = new SimpleDriverDataSource(); sds.setUserName( this.environment.getProperty( “ds.user”)); // ... return sds; } } ApplicationContext ctx = new AnnotationConfigApplicationContext( ServicesConfiguration.class ); Not confidential. Tell everyone.
- 24. Test Context Framework @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration( loader=AnnotationConfigContextLoader.class, classes={TransferServiceConfig.class, DataConfig.class}) @ActiveProfiles("dev") public class TransferServiceTest { @Autowired private TransferService transferService; @Test public void testTransferService() { ... } } 24
- 25. REST DESIGN WITH SPRING @starbuxman [email protected] [email protected] github.com/joshlong slideshare.net/joshlong Any ? Questions