Java EE 8 Update
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The document provides an overview of the Java EE 8 specification update including proposed enhancements and changes. Key points include: - Servlet 4.0 will add support for HTTP/2 to improve performance. Other specifications like JAX-RS 2.1 and JSF 2.3 will be enhanced. - Some originally planned specifications like JMS 2.1 and Java EE Management 2.0 may be dropped from Java EE 8. - A "reboot" was conducted and the scope of some specs like Security 1.0 was expanded. New specifications around areas like health checking and configuration may be added. - Specification groups are actively working on drafts and milestones for specs like CDI
![JMS 2.1 Asynchronous Batches
Example:
@MessageDriven
public class MyFlexibleMDB {
@JMSQueueListener(destinationLookup="java:global/
myQueue")
public void myMessageCallback(@Batch(maxSize=10,timeout=
1000) Message[] messages) {
...
}
JSR 368](https://image.slidesharecdn.com/javaee8update-170208005011/85/Java-EE-8-Update-18-320.jpg)
![Java EE Security: Proposed Provider
@SecurityProvider
public class MySecurityProvider {
@Inject UserService userService;
@OnAuthentication
// The parameters could suit the credentials mechanism being used.
public Principal getPrincipal(String username, String password) {
// Construct the principal using the user service.
}
@OnAuthorization
public String[] getRoles (Principal principal) {
// Construct an array of roles using the principal and user service.
}
}
JSR 375](https://image.slidesharecdn.com/javaee8update-170208005011/85/Java-EE-8-Update-51-320.jpg)
Java EE 8 Update
- 1. JAVA EE 8 UPDATE Ryan Cuprak
- 2. Agenda • Java EE 8 specification overview and current status • Example of proposed enhancements • JavaOne 2016 Java EE Reboot • How to get involved and help
- 3. Importance of Java EE https://javaee-guardians.io/java-ee-adoption-surveys
- 5. Microservices and Java EE http://microprofile.io
- 6. Java EE: Past, Present, Future J2EE 1.2 Servlet, JSP, EJB, JMS, RMI J2EE 1.3 CMP, JCA J2EE 1.4 Web Services, Mgmt, Deploy Java EE 5 Ease of Use, EJB 3, JPA, JSF, JAXB, JAX-WS Java EE 6 Pruning, Ease of Use, JAX-RS, CDI, Bean- ValidationWeb Profile Servlet 3, EJB 3.1 Lite Java EE 7 JMS 2, Batch, TX, Concurrency Web- Sockets, JSON Java EE 8 SERVLET 4, JSON-B, JSON-P 1.1, JSF 2.3, CDI 2.0, JAX- RS 2.1, SECURITY
- 7. Java EE 8 Community Survey https://java.net/downloads/javaee-spec/JavaEE8_Community_Survey_Results.pdf https://blogs.oracle.com/ldemichiel/entry/results_from_the_java_ee
- 8. Java EE 8 Overview – Original Plan • Continued Enhancements for Web Standards Alignment • HTTP/2, JSON Binding, JSON-P, MVC • Cloud enhancements • Security, RESTful Management API • CDI Programming Model • Ease of use, EJB via CDI • Smaller, but Important Features • Caching, Better Messaging • Alignment with Java SE 8
- 9. Java EE 8 Specifications (Original) • JMS 2.1 • JAX-RS 2.1 • JSF 2.3 • CDI 2.0 • JSON-P 1.1 • Servlet 4.0 • JCache 1.0 • JSON-B 1.0 • MVC 1.0 • Java EE Security1.0 • Java EE Management 2.0
- 10. Java EE 8 Reboot JSRs proposed to be dropped: • Management 2.0 (JSR 373) • JMS 2.1 (JSR 368) • MVC 1.0 (JSR 371) Expanded scope: • Security 1.0 (JSR 375) Proposed new JSRs: • Health Checking • Configuration New Survey Conducted Results Not Yet Published New Target Release Q4 2017
- 12. Servlet 4.0 • Early Draft published 10/2015 • Early implementation available in Tomcat 9 JSR 369 Expert Group Activity
- 13. Servlet 4.0: HTTP/2 • HTTP/2 Support -> Major Update • Why do we need HTTP/2? • Problems with HTTP/1.1: • Head-of-Line Blocking • HTTP Pipelining, File Concatenation, & Image Sprites • Key differences: • Binary instead of textual • Fully multiplexed instead of ordered and blocking • One connection for parallelism • Uses header compression • Allows server push JSR 369
- 14. Servlet 4.0: HTTP/2 Support NOTE: HTTPS only for browsers!
- 15. Servlet 4.0 • Principal goal to support HTTP/2 • Request/response multiplexing over single connection • Transparent to most developers, although possibly slight changes to the Servlet API • Most affected: frameworks JSR 369
- 16. Servlet 4.0 – Exposing HTTP./2 • Stream Prioritization • New Priority class • Enhance HttpServletRequest and HttpServletResponse to accommodate • Server Push • Frameworks can push resources to the client • Not replacing WebSockets JSR 369
- 17. Servlet 4.0 - HttpClient API • Plans to provide easy to use API • Target HttpClient in Java 9 • Support both HTTP/1.1 and 2 • Builds on existing Java API Classes JSR 368
- 18. JMS 2.1 Asynchronous Batches Example: @MessageDriven public class MyFlexibleMDB { @JMSQueueListener(destinationLookup="java:global/ myQueue") public void myMessageCallback(@Batch(maxSize=10,timeout= 1000) Message[] messages) { ... } JSR 368
- 19. JMS 2.1 Declarative JMS Listeners @ApplicationScoped @MaxConcurrency(10) public class HandlingEventRegistrationAttemptConsumer { @JmsListener( destinationLookup="jms/HandlingEventRegistrationAttemptQueue", selector="source = 'mobile'", batchSize=10, retry=5, retryDelay=7000, orderBy=TIMESTAMP) @Transactional public void onEventRegistrationAttempt( HandlingEventRegistrationAttempt... attempts) { ... } } JSR 368
- 20. JAX-RS 2.1 • JSR 370 - In Early Stages • No builds available for testing. • Reboot: Add Circuit Breaker support JSR 370 Expert Group Activity
- 21. JAX-RS 2.1 • Hypermedia API • Reactive API • Security API • Support for SSE (Server Sent Events) • Improved CDI Integration • Support for Non-Blocking IO in Providers JSR 370
- 22. JAX-RS 2.1 • Conditional JAXB on Runtimes • Integration with JSON-B • Support for CDI in Java SE JSR 370
- 23. JSF 2.3 • JSR 372 - in active progress • Milestones available for testing • Read, Test, Supply Feedback JSR 372 Emails from Oracle spec leads
- 24. JSF 2.3 • Standardize Web Socket integration • f:websocket • Multi-field validation • Enhanced CDI Integration • Lifecycle Enhancements • PostRenderViewEvent • EL API Enhancements • Configuration Enhancements • AJAX Enhancements JSR 372
- 25. JSF 2.3 Enhanced CDI Integration Injection of Resources @Inject FacesContext facesContext; @ApplicationMap @Inject Map applicationMap; JSR 372
- 26. JSF 2.3 Enhanced CDI Integration • Wider Support of Injection into JSF Artifacts • javax.faces.convert.Converter • javax.faces.validator.Validator • javax.faces.component.behavior.Behavior • Upgraded to CDI qualifiers JSR 372
- 27. CDI 2.0 • JSR 365 - in active progress • Early draft review 2 published August 2016 • Test Releases of Reference Implementation http://weld.cdi-spec.org/news/ JSR 374
- 28. CDI 2.0 • Java SE Bootstrap • XML Configuration • Asynchronous Events • @Startup for CDI Beans • Portable Extension SPI Simplification • Small features and enhancements JSR 374
- 29. CDI 2.0 Workshop Status Description Parts API was split Working on modularity (sub specs) Events Finished Enhance events (asynchronous, ordering,etc… ) AOP Started Interceptors & Decoractors enhancement Java SE First part done Boostrap CDI in Java SE JDK 8 Started Enhancements from Java 8 SPI Not Started more open SPI for 3rd party Contexts Not Started Provide a way to start/stop contexts for SE mode JSR 374
- 30. CDI Event System Enhancements • Asynchronous Events @Inject private ExperimentalEvent<Configuration> event; … event.fireAsync(new Configuration()); • Call to event.fireAsync() returns immediately JSR 365
- 31. CDI 2.0 @Schedule Outside EJB @ApplicationScoped public class MyScheduledBean { ... @Schedule(...) public void myScheduledTask() { ... } } @ApplicationScoped @Stereotype @Retention(RUNTIME) @Target(TYPE) @Schedule(...) public @interface MonthlyTask {} JSR 365
- 32. JSON-P 1.1 • JSR 374 - In Early Draft Review • More Information: • https://json-processing-spec.java.net/ • Sources: https://java.net/projects/jsonp JSR 374
- 33. JSON-P 1.1 • Updates to new API in Java EE 7 • New JSON Standards • JSON-Pointer and JSON-Patch • Editing Operations on JSON objects and arrays • Helper Classes and Enhanced Java SE 8 support JSR 374
- 34. JSON-P 1.1 Java SE 8 Support • Java 8 Stream Support • JsonArray persons; persons.getValuesAs(JsonObject.class).stream() .filter(x->x.getString(“age”) >= 65) .forEach(System.out.println(x.getString(“name”))); JSR 374
- 35. JSON-P 1.1: JSON-Pointer JSR 374
- 36. JSON-P 1.1: JSON-Patch public void shouldBuildJsonPatchExpressionUsingJsonPatchBuilder() { JsonPatchBuilder patchBuilder = new JsonPatchBuilder(); JsonObject result = patchBuilder.add("/email", "[email protected]") .replace("/age", 30) .remove("/phoneNumber") .test("/firstName", "John") .copy("/address/lastName", "/lastName") .apply(buildPerson()); } JSR 374
- 37. Java EE Management API 2.0 • Oracle proposing to drop JSR from EE 8. • Currently working on Early Draft • Java EE Management API 1.0 – released 2002 • Join mailing list of JSR 373 JSR 373
- 38. Java EE Management API 2.0 • REST Based Interface to Supersede EJB Management APIs of JSR 77 • Monitoring and deployment • SSE for Event Support (WebSockets also under consideration) JSR 373
- 39. Bean Validation 2.0 • Add support for LocalTime, Optional, etc. • Leverage type annotation, repeatable annotations, reflective parameter name retrieval • Potential enhancements: • Customized constraint validations • Object graph validation • Example: List<@Email String> emails; JSR 380
- 41. MVC • Model - View - Controller • JSR 371 • Active Progress…download milestones • Ozark: https://ozark.java.net/ JSR 371
- 42. MVC • Action-Based Web Framework for Java EE • Follows suit of Spring MVC or Apache Struts • Does Not Replace JSF • Model: CDI, Bean Validation, JPA • View: Facelets, JSP (Extensible) • Controller: Layered on top of JAX-RS JSR 371
- 43. MVC: Controller Example @Controller @Path("/customers") @View("my-view.jsp") public class CustomerController { @Inject private Models models; @GET public String getItems(){ . . . return “customers.jsp”; } JSR 371
- 44. MVC: View Example <c:forEach var="customer" items="${customers}"> <tr> <td class="text-left">${customer.name}</td> <td class="text-center"> <form action="${pageContext.request.contextPath}/r/customers/edit" method="POST"> <input type="hidden" name="id" value="${item.id}"/> <button type="submit"> Edit </button> </form> </td> </tr> </c:forEach> JSR 371
- 45. JSON-B • Java API for JSON Binding • JSR 367 - Public Review • Read the spec, start testing: https://java.net/projects/jsonb-spec/pages/Home JSR 367
- 46. JSON-B Next Logical Step • Standardize means of converting JSON to Java objects and vice versa • Default mapping algorithm for converting Java classes • Draw from best of breed ideas in existing JSON binding solutions • Provide JAX-RS a standard way to support “application/json” for POJOs • JAX-RS currently supports JSON-P JSR 367
- 47. JSON-B Mapping @Entity public class Person { @Id String name; String gender; @ElementCollection Map<String, String> phones; ... } Person duke = new Person(); duke.setName("Duke"); duke.setGender("Male"); phones = new HashMap<>(); phones.put("home", "650-123-4567"); phones.put("mobile", "650-234-5678"); duke.setPhones(phones); { "name":"Duke", "gender":"Male", "phones":{ "home":"650-123-4567", "mobile":"650-234-5678" } } JSR 367
- 48. JSON-B: Proposed Custom Mapping • Utilization of annotations to map fields to JSON Document Elements @JsonProperty(“poolType”) public String poolType; @JsonPropertyOrder(“poolType”,”shape”) public class Pool(){ public String poolType; public String shape; … } { poolType : “Inground”, } { poolType : “Inground”, shape : “Rectangle” } JSR 367
- 49. Java EE Security • Improve Java EE platform by ensuring that the security API is useful in the modern cloud/PaaS paradigm • Simplify, standardize, modernize • Promotes modern concepts (EL and CDI) JSR 367
- 50. Java EE Security • Simplify security providers • Easy pluggability and mapping • Enabling existing security annotations for all beans • Proposed examples: • https://github.com/javaee-security-spec/javaee-security-proposals JSR 375
- 51. Java EE Security: Proposed Provider @SecurityProvider public class MySecurityProvider { @Inject UserService userService; @OnAuthentication // The parameters could suit the credentials mechanism being used. public Principal getPrincipal(String username, String password) { // Construct the principal using the user service. } @OnAuthorization public String[] getRoles (Principal principal) { // Construct an array of roles using the principal and user service. } } JSR 375
- 52. Java EE Security – JavaOne 2016 • Add OAuth and OpenID support • Secret management JSR 375
- 53. JCache • Java Temporary Caching API • JSR 107 - Started in 2001 • Provides a common way for Java applications to create, access, update, and remove entries from caches JSR 197
- 54. JCache • Provide applications with caching functionality…particularly the ability to cache Java objects • Define common set of caching concepts & facilities • Minimize learning curve • Maximize portability • Support in-process and distributed cache implementations JSR 107
- 55. Others: Not Addressed • JPA • WebSocket • Concurrency Utilities • Batching • etc…
- 56. PROPOSED JSRS
- 57. Configuration • Standardize a mechanism of defining, injecting and using configuration within an application. • Define configuration persistence mechanisms, formats, and bindings. • Support for merging, overriding, and federating configurations from different sources • Provide a standard mechanism for working with mutable/dynamic configurations
- 58. Health Check • Goal: Standardize health reporting • Proposed new REST API enabling health checking • Available via configurable context (/healthcheck) • Will include semantics for reporting health • Health status codes • Reasons/warnings • Health of dependencies
- 59. Java EE Roadmap - JavaOne 2016 2016 • Feedback through Survey • Launch Java EE Next JSRs 2017 • Java EE 8 • Specs, RI, TCK complete • Initial microservices support • Define Java EE 9 • Early access implementation of Java EE 9 2018 • Java EE 9 • Specs, RI, TCK complete • Modular Java EE runtime • Enhanced microservices support
- 60. Java EE: Take Action • Start working with Java EE 8 today • Tools: • GlassFish v5 (or Payara) • Tomcat 9 web sockets • Milestones • Examples and Specification Docs
- 61. Java EE Resources • JavaOne 2016 EE 8 Update/Reboot • http://tinyurl.com/zeark5t • Java EE 8 by Arjan Tijms • https://javaee8.zeef.com/arjan.tijms • JavaOne 2016 Sessions • https://www.oracle.com/javaone/ • JSR 366 • https://www.jcp.org/en/jsr/detail?id=366
- 63. Adopt-A-JSR • Started in 2007, easy way for JUGs to get involved • What you can do depends upon what you want to do & what spec leads are looking for