a good primer on Spring's Java configuration style. I present simialar content to this as an introduction to many other talks.

1. Josh Long (⻰龙之春)
@starbuxman
joshlong.com
josh.long@springsource.com
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!
| josh.long@springsource.com
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
josh.long@springsource.com
josh@joshlong.com
github.com/joshlong
slideshare.net/joshlong
Any
?
Questions