Spring Boot for the Java EE Developer

Transcript

1. Spring Boot for the Java EE Developer
4. Overview • What is Spring Boot? • Spring Boot in a Java EE App Server • Java EE in Spring Boot
5. WARning!! may contain traces of Spring boot 1.3
6. What is Spring Boot? • Convention over configuration • Embedded Servlet Container • Zero XML
7. “Spring Boot is like pair programming with the Spring Team”
8. “We searched stackoverflow.com so you don’t have to”
9. Demo Spring Boot in 5 minutEs
10. Application Servers Deploying Spring Boot Apps to Java EE servers
11. Your Code Spring Libs Java EE Libs Servlet Container .jar java -jar myapp.jar
12. App Server Your Code Spring Libs Java EE Libs .war ./bin/asadmin start-domain
13. Converting an app <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> <exclusions> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> </exclusion> <exclusion> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-validation</artifactId> </exclusion> </exclusions> </dependency>
14. Converting an app <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>7.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <scope>provided</scope> </dependency> or
15. Converting an app @SpringBootApplication public class DemoApplication extends SpringBootServletInitializer { }
16. Demo Spring Boot on payara
17. Application Server Support • JNDI Support • DataSource / JMS / JTA / Java MAIL • Environment properties • Websphere Hibernate support • Wildfly & TomEE integration tests
18. Java EE Consuming Java EE From Boot
19. Convention & Configuration • Add a *-starter POM • Inject & use beans • Customize with application.properties • If it’s not enough: Define your own @Configuration
20. Servlets & Filters • There’s no web.xml • Register using Spring Beans • Servlet or filter directly • Using *registration beans • or ServletContext Initializer
21. Demo Filter
22. JPA • Entity scanning from @SpringBootApplication • Auto-configured in-memory database • or use application.properties spring.datasource.url=jdbc:mysql://localhost/test spring.datasource.username=dbuser spring.datasource.password=dbpass spring-boot-starter-jpa
23. Demo JPA
24. JMS • ActiveMQ / Artemis / HornetQ • Sending • Receiving // inject JmsMessagingTemplate template.convertAndSend(“dest”, “message”); @JmsListener(destination = "someQueue") public void processMessage(String content) { // ... } spring-boot-starter-artemis
25. Demo JMS
26. Websockets • Spring’s Support (with sockjs fallback) spring-boot-starter-websocket @SpringBootApplication @EnableWebSocket public class Application implements WebSocketConfigurer { @Override public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) { registry.addHandler(echoHandler(), "/echo").withSockJS(); } @Bean public WebSocketHandler echoWebSocketHandler() { return new EchoWebSocketHandler(); } }
27. Websockets • JSR 356 Support spring-boot-starter-websocket @ServerEndpoint("/reverse") public class ReverseWebSocketEndpoint { @OnMessage public void handleMessage(Session session, String message) throws IOException { StringBuilder reverse = new StringBuilder(message).reverse(); session.getBasicRemote().sendText("Reversed: " + reverse); } } @Bean public ServerEndpointExporter serverEndpointExporter() { return new ServerEndpointExporter(); }
28. Demo Websockets
29. Bean Validation • JSR-303 & JSR-349 support • Spring MVC DataBinder • and @ConfigurationProperties spring-boot-starter-validation
30. Bean Validation spring-boot-starter-validation @Component @ConfigurationProperties(prefix = "myapp") public class ExampleConfiguration { @Length(min = 8) private String password; public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } } #application.properties myapp.password=short
31. Demo Bean validation
32. Caching • JSR-107 Auto-configuration (+ Others) • Spring’s @Cachable annotation spring-boot-starter-cache @Service public class MyService { @Cacheable("mycache") public String lengthy(int id) { // … } }
33. Demo Caching
34. Java mail • Auto-Configuration for java mail • MailSender interface spring-boot-starter-mail SimpleMailMessage message = new SimpleMailMessage(); message.setTo("example@example.com"); message.setText("Hello World!"); mailSender.send(message); spring.mail.host=mymailserver spring.mail.port=8025
35. Demo Java mail
36. Conclusion • Great way to consume Java EE • inside or outside of an App Server • cloud friendly • Go to spring.io for more information
37. Thanks! Questions? @phillip_webb speakerdeck.com/philwebb github.com/philwebb/spring-boot-for-the-java-ee-developer spring.io/blog/2014/11/23/bootiful-java-ee-support-in-spring-boot-1-2