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Java EE 與 雲端運算的展望
Java EE 7 will focus on enabling Java EE applications and services to easily operate in public and private cloud environments. Key areas of focus include improved packaging for cloud deployment, tighter resource management, and potential new APIs for cloud services. Modularity enhancements based on Java SE 8 modules will allow applications to be composed of independent, versioned modules. The first Java EE 7 specifications have already been approved.
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Java EE 與 雲端運算的展望
- 2. Java EE 7 Reachingfor the Cloud Lee Chuk Munn chuk-munn.lee@oracle.com
- 3. The following isintended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle's products remains at the sole discretion of Oracle.
- 4. Java EE 6Platform December 10, 2009
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- 8. What is Newin Java EE 6? • Several new APIs • Web profile • Pluggability/extensibility • Dependency injection • Lots of improvements to existing API
- 9. New And UpdatedComponents • EJB 3.1 (+Lite) • Managed Beans 1.0 • JPA 2.0 • Interceptors 1.1 • Servlet 3.0 • JSP 2.2 • JSF 2.0 • EL 2.2 • JAX-RS 1.1 • JSR-250 1.1 • Bean Validation 1.0 • JASPIC 1.1 • DI 1.0 • JACC 1.5 • CDI 1.0 • JAX-WS 2.2 • Connectors 1.6 • JSR-109 1.3
- 10. Java EE 6Web Profile Web container JSP 2.2 extensions JSF 2.0 JSTL 1.2 CDI Bean Validation 1.0 extensions Servlet 3.0 · EL 2.2 DI 1.0 · CDI 1.0 · Interceptors 1.1 · JSR-250 1.1 Managed Beans 1.0 EJB 3.1 Lite JPA 2.0 · JTA 1.1
- 11. Web Tier Updates •Annotations in Servlet 3.0 • Automatic discovery and registration of libraries • web.xml is optional • Package static files in resource jars • Use EJBs directly inside web apps
- 12. Web Apps SimplifiedPackaging Web Application WEB-INF/classes com/acme/MyServlet.class com/acme/MyFilter.class WEB-INF/lib someframework.jar WEB-INF/web.xml index.html main.css jquery-1.4.2.js ui/jquery.ui.core.js ui/jquery.ui.widget.js
- 13. Web Apps SimplifiedPackaging Web Application WEB-INF/classes @WebServlet(urlPatterns=”/foo”) com/acme/MyServlet.class public class MyServlet { … } com/acme/MyFilter.class WEB-INF/lib @WebFilter(urlPatterns=”/foo”) someframework.jar public class MyFilter { … } WEB-INF/web.xml index.html main.css jquery-1.4.2.js ui/jquery.ui.core.js ui/jquery.ui.widget.js
- 14. Web Apps SimplifiedPackaging Web Application WEB-INF/classes com/acme/MyServlet.class com/acme/MyFilter.class Framework Jar WEB-INF/lib META-INF/web-fragment.xml someframework.jar com/fw/FwServlet.class com/fw/FwFilter.class index.html main.css jquery-1.4.2.js ui/jquery.ui.core.js ui/jquery.ui.widget.js
- 15. Web Apps SimplifiedPackaging Web Application WEB-INF/classes com/acme/MyServlet.class com/acme/MyFilter.class WEB-INF/lib someframework.jar jQuery Resource Jar jquery-ui-1.8.4.jar META-INF/resources/jquery-1.4.2.js META-INF/resources/ui/jquery.ui.core.js META-INF/resources/ui/jquery.ui.widget.js index.html main.css
- 16. Web Apps SimplifiedPackaging Web Application • Self-contained WEB-INF/classes • Generic com/acme/MyServlet.class • Reusable com/acme/MyFilter.class WEB-INF/lib someframework.jar jquery-ui-1.8.4.jar index.html main.css
- 17. Java EE 6Programming Model • Complementary declarative/programmatic layer • Annotations are additive • Code can evolve gradually • Managed beans as a common foundation
- 18. EJB 3.1 Lite •Session bean programming model • Stateless, singleton programming model • Annotation based declarative security and transactions • Deployment descriptors are optional
- 19. EJB 3.1 NewFirst Class Construct @Singleton @Startup public class StartupBean { @PostConstruct public void doAtStartup() { … } } @Stateless public class BackupBean { @Schedule(dayOfWeek=”Fri”, hour=”3”, minute=”15”) public void performBackup() { … } } @Stateless public class BatchProcessor { @Asynchronous public Future<Result> submit(Task t){ … } }
- 20. Dependency Injection • Powerfultype-safe model • Can be enabled per-module • Integrated with JSF, JSP, EJB, web tier • Friendly to pre-Java EE 6 resources and services • Event model • Highly extensible
- 21. Bean with ConstructorInjection @RequestScoped public class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…}
- 22. Bean with ConstructorInjection @RequestScoped public class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) Types PaymentProcessor processor, @Default ShoppingCart cart) {…}
- 23. Bean with ConstructorInjection @RequestScoped public class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) Qualifiers PaymentProcessor processor, @Default ShoppingCart cart) {…}
- 24. Bean with ConstructorInjection Request scoped @RequestScoped public class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…}
- 25. Bean with ConstructorInjection @RequestScoped public class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) Session scoped PaymentProcessor processor, @Default ShoppingCart cart) {…}
- 26. Bean with ConstructorInjection @RequestScoped public class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…} Application scoped
- 27. Bean with ConstructorInjection @RequestScoped public class CheckoutHandler { @Inject public CheckoutHandler( @LoggedIn User user, @Reliable @PayBy(CREDIT_CARD) PaymentProcessor processor, @Default ShoppingCart cart) {…} Conversation scoped
- 28. Java EE 7 Cloudy Ahead
- 29. Layers of Cloud Software as a Service (SaaS) Platform as a Service (PaaS) Infrastructure as a Service (IaaS)
- 30. Java EE andthe Cloud • Containers are back in vogue! • We have containers • We have services... injectable services... • We scale to large clusters... • We have a security model...
- 31. JSR 342 –Java EE for the Cloud • More easily operate on public/private cloud – Multi tenancy, elasticiy • Tighter requirements for resource and state management • Better isolation between applications • Potential standard APIs for NRDBMS, caching, etc. • Common management and monitoring interfaces • Evolving the platform
- 32. Better Packaging forthe Cloud • Applications should be versioned • Multiple versions should be able to coexists • Dealing with data versioning, upgrades, etc. • Need the ability to specify QoS properties • Exposed and connected to services
- 33. Cloud Platform Application Java Persistence Queueing Service Service Service ... State Management Virtualization Layer
- 34. Cloud Platform Application Code Code Code QoS Module Module Module Schema Migration Security Information … Java Persistence Queueing Service Service Service ... State Management Virtualization Layer
- 35. Cloud Platform Application Application Application Application Application Java Persistence Queueing Service Service Service ... State Management Virtualization Layer
- 36. Cloud Platform Managed Environment Application Application Application Application Application Java Persistence Queueing Service Service Service ... State Management Virtualization Layer
- 37. Modularity • Build onJavaSE 8 modularity • Applications are composed of modules • Dependencies are explicit • Versioning is built-in • Additional metadata for JavaEE
- 38. JavaSE 8 Modules com.foo.app module-info.java module com.foo @ 1.0.0 { com.foo.extra class com.foo.app.Main requires com.foo.lib @ 2.1-alpha; com.foo.lib provides com.foo.app.lib @ 1.0.0; requires optional com.foo.extra; } org.bar.lib edu.baz.util
- 39. Packaging and Install •Compiling Java classes with modules $ javac -modulepath mods src/com.foo.app/... • Packaging classes into modules $ jpkg -modulepath mods jmod com.foo.app com.foo.extra com.foo.lib • Installing modules into library $ jmod -L mlib install $EXT/edu.baz.util@*.jmod $EXT/org.bar.lib@*.jmod
- 40. Modular Applications j1demo.app j1demo-1.0.3
- 41. Modular Applications j1demo.app twitter-client-2.3.0 j1demo-1.0.3 requires j1demo-persist-1.4.0
- 42. Modular Applications j1demo.app twitter-client-2.3.0 j1demo-1.0.3 j1demo-persist-1.4.0 javaee-web-7.0 jpa-2.1 jax-rs-2.0
- 43. Modular Applications j1demo.app twitter-client-2.3.0 j1demo-1.0.3 j1demo-persist-1.4.0 javaee-web-7.0 jpa-2.1 jax-rs-2.0 implements gf-appserv-4.01. ...
- 44. Modular Applications j1demo.app twitter-client-2.3.0 j1demo-1.0.3 j1demo-persist-1.4.0 javaee-web-7.0 jpa-2.1 jax-rs-2.0 implements gf-appserv-4.01. eclipselink- 2.1.3 ... jersey-2.0.5
- 45. Modular Applications j1demo.app twitter-client-2.3.0 jax-rs-2.1 j1demo-1.0.3 j1demo-persist-1.4.0 jersey-2.1.1 javaee-web-7.0 jpa-2.1 gf-appserv-4.01. eclipselink- 2.1.3 ...
- 46. Modular Applications j1demo.app twitter-client-2.3.0 jax-rs-2.1 j1demo-1.0.3 j1demo-persist-1.4.0 jersey-2.1.1 javaee-web-7.0 jpa-2.1 jax-rs-2.1 gf-appserv-4.01. eclipselink- 2.1.3 ... jersey-2.1.1
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- 48. Web Tier • Websocket support in Servlet container • Standard JSON API • HTML5 support in JSF • NIO2 based web container • Updates to Web Profile • JAX-RS 2.0 will be mandatory
- 49. New API • ConcurrencyUtilities – JSR 236 – Eg. transaction-, security- naming- aware ExecutorService • JCache – JSR 107 – Local cache API, key-value map – Needs to be aligned with JPA cache API • JMS 2.0 – Annotation based programming model to JMS • JSON 1.0 • RESTful client API for JAX-RS 2.0
- 50. Java EE 7JSRs Status Approved Ongoing • JPA 2.1 • Concurrency Utilities 1.0 • JAX-RS 2.0 • JCache 1.0 • Servlet 3.1 • EL 3.0 Yet to be filed • Platform 7/Web Profile 7 • EJB 3.2 • JMS 2.0 • CDI 1.1 • JSF 2.2 • JSR-330 1.1 • Bean Validation 1.1 • JSON 1.0
- 51. Java EE 7Schedule • First seven JSRs already filed • Remaining ones to be filed soon... – Stay tuned • Final release late 2012 • Date driven release – Anything not ready will be deferred to Java EE 8
- 52. JavaEE 6 onthe Cloud Today
- 53. JRockit Virtualized Edition • Oracle JRockit VE runs natively on hypervisor – Better performance – Improved security • Deterministic GC behaviour – “Soft” real-time • Simple administration – Console and scripting
- 54. Java EE 6Platform Available from http://www.oracle.com/javaee
- 55. Java EE 7 Reachingfor the Cloud Lee Chuk Munn chuk-munn.lee@oracle.com