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50 features of Java EE 7 in 50 minutes at Geecon 2014

Arun Gupta, profile picture
Arun Gupta

This document provides a summary of 50 features of Java EE 7 across various Java EE technologies like CDI, EJB, JPA, JTA, JMS and more. Each feature is summarized in 1-2 lines with the specification and a brief description. The document is aimed at covering 50 features of Java EE 7 in 50 minutes for developers to get up to speed with the latest additions and enhancements in various Java EE technologies.

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1 50 features of Java EE 7 in 50 minutes Arun Gupta, @arungupta
2 #NN: <spec>: <feature>
3 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5
4 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 CDI 1.1 (JSR 346)
5 #01: CDI: Default enabling Finer scanning control Possible values: all, annotated, none! Annotated behaves like in Java EE 6 (default)! ! <beans ... version="1.1" bean-discovery-mode="all">! <alternatives>! <class>org.agoncal.book.MockGenerator</class>! </alternatives>! </beans>!
6 #02: CDI: @Vetoed Veto the processing of the class or package @Vetoed! public class NonProcessedBean {
 ...! }! ! package-info.java @Vetoed! package com.non.processed.package;!
7 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Bean Validation 1.1 (JSR 349)
8 #03: Bean Validation: Method validation public class CardValidator {! ! public CardValidator(@NotNull Algorithm algorithm) {! this.algorithm = algorithm;! }! ! @AssertTrue! public Boolean validate(@NotNull CreditCard creditCard) {! return algorithm.validate(creditCard.getNumber());! }! }! Pre/post conditions on method and constructors
9 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Interceptors 1.2 (JSR 318)
10 #04: Interceptors: AroundConstruct Interceptor associated with a constructor public class LoggingInterceptor {! ! @AroundConstruct! private void init(InvocationContext ic) 
 throws Exception{! logger.fine("Entering constructor");! ic.proceed();! logger.fine("Exiting constructor");! }! ! @AroundInvoke! public Object logMethod(InvocationContext ic) ... { // ...! }! }!
11 #05: Interceptors: @Priority Prioritizing interceptor bindings PLATFORM_BEFORE (0), LIBRARY_BEFORE (1000), APPLICATION (2000), LIBRARY_AFTER (3000), PLATFORM_AFTER (4000)! @Interceptor! @Loggable! @Priority(Interceptor.Priority.LIBRARY_BEFORE + 10)! public class LoggingInterceptor {! ! @AroundInvoke! ...! }!
12 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Concurrency Utilities 1.0 (JSR 236)
13 #06: Concurrency: ManagedExecutor User threads in Java EE applications Support simple and advance concurrency design patterns Extend Concurrency Utilities API from Java SE (JSR 166y) java.util.concurrent package
14 #06: Concurrency: ManagedExecutor @Resource
 ManagedExecutorService executor;
 ! 
 ManagedExecutorService executor = 
 (ManagedExecutorService) ctx
 .lookup("java:comp/DefaultManagedExecutorService");! Default ManagedExectuor
15 #06: Concurrency: ManagedExecutor <web-app … version="3.1">! <resource-env-ref>! <resource-env-ref-name>! concurrent/myExecutor! </resource-env-ref-name>! <resource-env-ref-type>! javax.enterprise.concurrent.ManagedExecutorService! </resource-env-ref-type>! </resource-env-ref>! </web-app>! Specify in web.xml
16 #07: Concurrency: ManagedScheduledExecutor Managed version of ScheduledExecutorService! Submit delayed or periodic tasks @Resource
 ManagedScheduledExecutorService executor;!
17 #07: Concurrency: ManagedScheduledExecutor InitialContext ctx = new InitialContext(); 
 
 ManagedScheduledExecutorService executor = (ManagedScheduledExecutorService)ctx.lookup(
 "java:comp/DefaultManagedScheduledExecutorService");
 ! Can be defined in web.xml as well Access using JNDI
18 #07: Concurrency: ManagedScheduledExecutor executor.schedule(new MyCallableTask(), 5, TimeUnit.SECONDS);! executor.scheduleAtFixedRate(new MyRunnableTask(), 2, 3, TimeUnit.SECONDS);! executor.scheduleWithFixedDelay(new MyRunnableTask(), 2, 3, TimeUnit.SECONDS);!
19 #08: Concurrency: ManagedThreadFactory Extends ThreadFactory @Resource(name = "DefaultManagedThreadFactory")
 ManagedThreadFactory factory; ManagedThreadFactory factory = (ManagedThreadFactory) ctx.lookup("java:comp/DefaultManagedThreadFactory");

20 #08: Concurrency: ManagedThreadFactory Thread thread = factory.newThread(new MyTask()); ((ManageableThread)thread).isShutdown();

21 #09: Concurrency: DynamicProxy Create dynamic proxy objects, adds contextual information available for applications running in Java EE environment Classloading, JNDI, Security, …
22 #09: Concurrency: DynamicProxy @Resource
 ContextService service;
 
 
 Runnable proxy = service.createContextualProxy(new MyRunnable(), Runnable.class);
 
 
 Future f = executor.submit(proxy);!
23 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JPA 2.1 (JSR 338)
24 #10: JPA: Schema Generation Standardized database schema generation <persistence ... version="2.1">! <persistence-unit ...>! <properties>! <property
 name="javax.persistence.schema-generation.scripts.action”! value="drop-and-create"/>! <property
 name="javax.persistence.schema-generation.scripts.create-target" value="create.sql"/>! <property name="javax.persistence.sql-load-script-source" ! value="insert.sql"/>! </properties>! </persistence-unit>!
25 #11: JPA: @Index Defines additional indexes in schema generation @Entity! @Table(indexes = {! @Index(columnList = "ISBN"),! @Index(columnList = "NBOFPAGE")! })! public class Book {! ! @Id @GeneratedValue! private Long id;! private String isbn;! private Integer nbOfPage;! ...! }!
26 #12: JPA: Unsynchronized PC Persistence context is not enlisted in any tx unless explicitly joined @PersistenceContext(synchronization =! SynchronizationType.UNSYNCHRONIZED)! private EntityManager em;! ...! ! em.persist(book);! ! ...! em.joinTransaction();! !
27 #13: JPA: Stored Procedure Calling a stored procedure @Entity! @NamedStoredProcedureQuery(name = "archiveOldBooks", ! procedureName = "sp_archive_books",! parameters = {! @StoredProcedureParameter(name = ”date", mode = IN, ! type = Date.class),! @StoredProcedureParameter(name = "warehouse", mode = IN, type = String.class)! })! public class Book {...}!
28 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JTA 1.2 (JSR 907)
29 #14: JTA: @Transactional Transaction management on Managed Beans as CDI interceptor binding @Path("book")! @Transactional(value = Transactional.TxType.REQUIRED,! rollbackOn = {SQLException.class, JMSException.class},! dontRollbackOn = SQLWarning.class)! public class BookRestService {! ! @PersistenceContext! private EntityManager em;! ! @POST! @Consumes(MediaType.APPLICATION_XML)! public Response createBook(Book book) {...}! }!
30 #15: JTA: @TransactionScoped CDI scope whose lifecycle is scoped to the currently active JTA transaction @TransactionScoped! public class BookBean {...}! ! @WebServlet! public class TxServlet extends HttpServlet {! @Inject UserTransaction tx;! @Inject BookBean b1;! @Inject BookBean b2;! ! protected void processRequest(...) {! tx.begin();! s_out.println(b1.getReference());! s_out.println(b2.getReference());! tx.commit();! }! }!
31 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 EJB 3.2 (JSR 345)
32 #16: EJB: Disable passivation of stateful @Stateful(passivationCapable = false)! public class ShoppingCart {! ...! }! In some cases increases performance, scalability and robustness
33 #17: EJB-Lite: Async + Non-persistent timer @Stateless! public class OrderEJB {! ! @Asynchronous! public void sendEmail (Order order) {! // Very Long task! }! ! @Schedule(hour="2", persistent=false)! public void createDailyReport() {! // ...! }! }! Extended the EJB Lite to include local asynchronous invocations and non-persistent EJB Timer Service
34 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JMS 2.0 (JSR 343)
35 #18: JMS: JMSContext API New simplified API to produce and consume messages @Inject JMSContext ctx;! ! ctx.createProducer().send(queue, "Text message sent");! ! ctx.createConsumer(queue).receiveBody(String.class);! ! ctx.createProducer()! .setPriority(2)! .setTimeToLive(1000)! .setDeliveryMode(DeliveryMode.NON_PERSISTENT)! .send(queue, message);!
36 #19: JMS: Autocloseable Several JMS interfaces implement Autocloseable try (JMSContext ctx = connectionFactory.createContext()) {! ctx.createProducer().send(queue, "Text message sent");! }! ! ...! ! try (JMSContext ctx = connectionFactory.createContext()) {! while (true) {! String s = ctx.createConsumer(queue).receiveBody(String.class);! }! }!
37 #20: JMS: JMSConnectionFactoryDefinition @Stateless! @JMSConnectionFactoryDefinition(! name = "java:app/jms/MyConnectionFactory",! interfaceName = "javax.jms.TopicConnectionFactory")! ! ! ! public class ExpensiveOrderEJB {...}! A JMS ConnectionFactory can be defined using an annotation on a container-managed class
38 #21: JMS: JMSDestinationDefinition A JMS queue or topic can be defined using an annotation @Stateless! @JMSConnectionFactoryDefinition(! name = "java:app/jms/MyConnectionFactory",! interfaceName = "javax.jms.TopicConnectionFactory")! @JMSDestinationDefinition(! name = "java:app/jms/MyTopic",! interfaceName = "javax.jms.Topic")! public class ExpensiveOrderEJB {...}!
39 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Servlet 3.1 (JSR 340)
40 #22: Servlet: Non-blocking I/O public class TestServlet extends HttpServlet
 protected void doGet(HttpServletRequest request,
 HttpServletResponse response) 
 throws IOException, ServletException {
 ServletInputStream input = request.getInputStream();
 byte[] b = new byte[1024];
 int len = -1;
 while ((len = input.read(b)) != -1) {
 . . .
 }
 }
 }!
41 #22: Servlet: Non-blocking I/O ServletInputStream! public void setReadListener(ReadListener listener);! public boolean isFinished();! public boolean isReady();! ServletOutputStream! public setWriteListener(WriteListener listener);! public boolean canWrite();! New methods to existing interfaces
42 #22: Servlet: Non-blocking I/O public interface ReadListener extends EventListener {
 public void onDataAvailable();
 pubic void onAllDataRead();
 public void onError();
 }! public interface WriteListener extends EventListener {
 public void onWritePossible();
 public void onError();
 }! New interfaces
43 #22: Servlet: Non-blocking I/O AsyncContext context = request.startAsync();
 ServletInputStream input = request.getInputStream();
 input.setReadListener(
 new MyReadListener(input, context)); ! Only for Asynchronous Servlets
44 #23: Servlet: Protocol Upgrade <T extends HttpUpgradeHandler> T HttpServletRequest.upgrade(Class<T> class) throws IOException;
 
 
 ! HttpUpgradeHandler! init(WebConnection wc);! destroy();!
45 #23: Servlet: Protocol Upgrade public interface WebConnection {
 ServletInputStream getInputStream();
 ServletOutputStream getOutputStream();
 }!
46 #24: Servlet: Improved Security <web-app . . . version="3.1"> 
 <web-resource-collection>
 <url-pattern>/account/*</url-pattern> 
 <http-method>GET</http-method>
 </web-resource-collection>
 <auth-contraint>
 . . .
 </auth-contraint>
 </web-app> ! ! Deny an HTTP method request for an uncovered HTTP method
47 #24: Servlet: Improved Security <web-app . . . version="3.1"> 
 <deny-uncovered-http-methods/>
 <web-resource-collection>
 <url-pattern>/account/*</url-pattern> 
 <http-method>GET</http-method>
 </web-resource-collection>
 <auth-contraint>
 . . .
 </auth-contraint> 
 </web-app> ! ! Deny an HTTP method request for an uncovered HTTP method
48 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Web Socket 1.0 (JSR 356)
49 #25: WebSocket: Annotated server endpoint Enables full-duplex bi-directional communication over single TCP connection @javax.websocket.server.ServerEndpoint("/chat")
 public class ChatServer {
 
 @OnMessage
 public String chat(String name, Session session) {
 for (Session peer : client.getOpenSessions()) {! peer.getBasicRemote().sendObject(message);! }
 }
 }!
50 #26: WebSocket: Lifecycle callbacks @javax.websocket.OnOpen
 public void open(Session s) { . . . }
 
 @javax.websocket.OnClose
 public void close(CloseReason c) { . . . }
 
 @javax.websocket.OnError
 public void error(Throwable t) { . . . }!
51 #27: WebSocket: Annotated client endpoint @javax.websocket.ClientEndpoint
 public class MyClient {
 @javax.websocket.OnOpen
 public void open(Session session) { … }
 
 // Lifecycle callbacks
 }!
52 #27: WebSocket: Annotated client endpoint ContainerProvider
 .getWebSocketContainer()
 .connectToServer(
 MyClient.class, 
 URI.create("ws://. . ."));!
53 #28: WebSocket: Programmatic endpoints public class ChatServer extends Endpoint {
 @Override
 public void onOpen(Session s, EndpointConfig ec) {
 s.addMessageHandler(new MessageHandler.Whole<String>() { public void onMessage(String text) { . . . }
 }
 }
 
 @Override
 public void onClose(Session s, CloseReason cr) { . . . }
 
 //. . . 
 }!
54 #28: WebSocket: Programmatic endpoints public class MyApplicationConfig implements ServerApplicationConfig {
 public Set<ServerEndpointConfig> getEndpointConfigs(…) { 
 ServerEndpointConfig.Builder
 .create(MyEndpoint.class, "/websocket”)
 .configurator(new MyConfig())
 .build()
 }
 }!
55 #28: WebSocket: Programmatic endpoints public class MyConfig extends ServerEndpointConfig.Configurator {
 
 public <T> T getEndpointInstance(. . .) { . . . }
 
 public void modifyHandshake(. . .) { . . . }
 
 . . .
 }!
56 #29: WebSocket: Encoder and Decoder @javax.websocket.server.ServerEndpoint(
 value="/chat",
 decoders="MyDecoder.class",
 encoders="MyEncoder.class")
 public class ChatServer {
 
 @OnMessage
 public String chat(ChatMessage name, Session session) {
 . . . 
 }
 }!
57 #29: WebSocket: Encoder and Decoder public class MyDecoder implements Decoder.Text<ChatMessage> {
 public ChatMessage decode(String s) {
 // . . .
 }
 
 public boolean willDecode(String string) {
 // . . .
 }
 
 //. . .
 }
 
 !
58 #29: WebSocket: Encoder and Decoder public class MyEncoder implements Encoder.Text<ChatMessage> {
 
 public String encode(ChatMessage chatMessage) {
 // . . .
 }
 ! // . . .
 }!
59 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Expression Language 3.0 (JSR 341)
60 #30: Expression Langauge: ELProcessor Use EL in a stand-alone environment Evaluate EL expressions Defining a static method as an EL function Defining an object instance as an EL name ELProcessor elp = new ELProcessor();
 elp.defineBean("employee", new Employee("Charlie Brown"));
 String name = elp.eval("employee.name");!
61 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JSF 2.2 (JSR 344)
62 #31: JSF: Faces Flow ./src/main/webapp/flow1
 /flow1.xhtml
 /flow1a.xhtml
 /flow1b.xhtml
 ./src/main/webapp/flow2
 /flow2-flow.xml
 /flow2.xhtml
 /flow2a.xhtml
 /flow2b.xhtml
 /index.xhtml! Package reusable flows in JAR
63 #31: JSF: Faces Flow @Named
 @FlowScoped("flow1")
 public class Flow1Bean implements Serializable {
 }! ! @Produces @FlowDefinition
 public Flow defineFlow(@FlowBuilderParameter FlowBuilder fb) {
 String flowId = "flow1";
 //. . .
 return fb.getFlow();
 }! Package reusable flows in JAR
64 #31: JSF: Faces Flow #{flowScope}: Local flow storage #{facesContext.application.flowHandler.currentFlow}: Returns true if within a flow Package reusable flows in JAR
65 #32: JSF: Resource Library Contract index-blue.xhtml
 index-red.xhtml
 WEB-INF/lib/contracts-library-1.0-SNAPSHOT.jar
 /META-INF/contracts/blue
 /style.css
 /javax.faces.contract.xml
 /template.xhtml
 /META-INF/contracts/red
 /style.css
 /javax.faces.contract.xml
 /template.xhtml! Apply templates in a reusable and interchangeable manner
66 #32: JSF: Resource Library Contract <f:view contracts=”red”>
 <ui:composition template="/template.xhtml">
 . . .
 </ui:composition>
 </f:view>
 ! Apply templates in a reusable and interchangeable manner
67 #33: JSF: Pass-through Attributes <h:inputText type="email" value="#{user.email}"/> 
 ! <input type="text" name="j_idt6:j_idt10"/>! HTML5-Friendly Markup <h:inputText p:type="email" value="#{user.email}"/> 
 
 <input type="email" name="j_idt6:j_idt10"/>! !
68 #34: JSF: File Upload Component <h:form enctype="multipart/form-data">
 <h:inputFile value="#{fileUploadBean.file}"/><br/>
 <h:commandButton value="Upload"/><p/>
 </h:form> ! @Named @RequestScoped 
 public class FileUploadBean {
 private Part file;
 
 //getter and setter
 } !
69 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JAX-RS 2.0 (JSR 339)
70 #35: JAX-RS: Client API Client client = ClientBuilder.newClient();! WebTarget target = client.target("http://www.foo.com/ book");! Invocation invocation = target.request(TEXT_PLAIN).buildGet();! Response response = invocation.invoke();! ! Response response = ClientBuilder.newClient()! .target("http://www.foo.com/book")! .request(MediaType.TEXT_PLAIN)! .get();! ! String body = ClientBuilder.newClient()! .target("http://www.foo.com/book")! .request()! .get(String.class);! New API to consume rest services
71 #36: JAX-RS: Async Client Future<String> future = ClientBuilder.newClient()! .target("http://www.foo.com/book")! .request()! .async()! .get(String.class);! ! try {! String body = future.get(1, TimeUnit.MINUTES);! } catch (InterruptedException | ExecutionException e) { . . .
 }! The client API also supports asynchronous invocation
72 #37: JAX-RS: Async Server @Path("/async")! public class AsyncResource {! ! @GET! public void asyncGet(@Suspended AsyncResponse asyncResp) {! ! new Thread(new Runnable() {! ! public void run() {! String result = veryExpensiveOperation();! asyncResp.resume(result);! }! }).start();! }}! Asynchronous request processing on the server
73 #38: JAX-RS: Message Filter Filters on client side ClientRequestFilter! ClientResponseFilter! Filters on server side ContainerRequestFilter! ContainerResponseFilter! Used to process incoming and outgoing request or response headers
74 #38: JAX-RS: Message Filter public class LogginFilter implements ClientRequestFilter {! ! public void filter(ClientRequestContext ctx) throws IOException {! System.out.println(ctx.getMethod());! System.out.println(ctx.getUri());! }! }! Used to process incoming and outgoing request or response headers
75 #39: JAX-RS: Entity Interceptors Intercepts inbound entity streams (reads from the “wire”) ReaderInterceptor! Intercepts outbound entity streams (writes to the “wire”) WriterInterceptor! Marshalling and unmarshalling HTTP message bodies
76 #39: JAX-RS: Entity Interceptors public class GZipInterceptor implements WriterInterceptor {! ! public void aroundWriteTo(WriterInterceptorContext ctx){! OutputStream os = ctx.getOutputStream();! ctx.setOutputStream(new GZIPOutputStream(os));! ctx.proceed();! }! }! Marshalling and unmarshalling HTTP message bodies
77 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JSON-P 1.0 (JSR 353)
78 #40: JSON-P: JSON Builder JsonObject value = Json.createObjectBuilder()! .add("id", "1234")! .add("date", "19/09/2012")! .add("total_amount", "93.48")! .add("customer", Json.createObjectBuilder()! .add("first_name", "James")! .add("last_name", "Rorrison")! .add("email", "j.rorri@me.com")! .add("phoneNumber", "+44 12341234")! )! .build();! Creates an object model (or an array) in memory by adding elements
79 #41: JSON-P: JsonParser JsonParser parser = Json.createParser(new FileReader(“order.json"));! while (parser.hasNext()) {! JsonParser.Event event = parser.next();! ! if (event.equals(JsonParser.Event.KEY_NAME) && ! parser.getString().matches("email")) {! parser.next();! email = parser.getString();! }! }! Event-based parser that can read JSON data from a stream
80 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Batch 1.0 (JSR 352)
81 #42: Batch: Chunk-style Processing Item-oriented Processing Style (primary)
82 #42: Batch: Chunk-style Processing <step id=”sendStatements”>! <chunk item-count=“3”>
 <reader ref=”accountReader”/>! <processor ref=”accountProcessor”/>
 <writer ref=”emailWriter”/>! </step>! …implements ItemReader {
 public Object readItem() {
 // read account using JP }! ! …implements ItemProcessor {! public Object processItems(Object account) {
 // read Account, return Statement! }! ! …implements ItemWriter {! public void writeItems(List accounts) {
 // use JavaMail to send email! }! !
83 #43: Batch: Batchlet-style Processing Task-oriented processing style <step id=”transferFile”>! <batchlet ref=“MyFileTransfer” />! </step>! …implements Batchlet {! @Override
 public void process() {
 // Transfer file! }! !
84 #44: Batch: Job/Step/Chunk Listeners <job id="myJob" xmlns="http://xmlns.jcp.org/xml/ns/javaee" version="1.0”>
 <listeners>
 <listener ref="myJobListener"/>
 </listeners>
 <step id="myStep" >
 <listeners>
 <listener ref="myStepListener"/>
 <listener ref="myChunkListener"/>
 <listener ref="myItemReadListener"/>
 <listener ref="myItemProcessorListener"/>
 <listener ref="myItemWriteListener"/>
 </listeners>
 <chunk item-count="3”>. . .</chunk>
 </step>
 </job>! !
85 #44: Batch: Job/Step/Chunk Listeners Interface Abstract Classes JobListener! AbstractJobListener! StepListener! AbstractStepListener! ChunkListener! AbstractChunkListener! ItemRead/Write/ ProcessListener! AbstractItemRead/Write/ ProcessListener! SkipRead/Write/ ProcessListener! AbstractSkipRead/Write/ ProcessListener! RetryRead/Write/ ProcessListener! AbstractRetryRead/Write/ ProcessListener!
86 #44: Batch: Job/Step/Chunk Listeners @Named
 public class MyJobListener extends AbstractJobListener {
 
 @Override
 public void beforeJob() throws Exception { . . . }
 
 @Override
 public void afterJob() throws Exception { . . . }
 }!
87 #45: Batch: Partition <step>
 <chunk item-count="3">
 <reader ref="myItemReader">
 <properties>
 <property name="start" value="#{partitionPlan['start']}"/>
 <property name="end" value="#{partitionPlan['end']}"/>
 </properties> 
 </reader>
 . . .
 </chunk>!
88 #45: Batch: Partition <partition>
 <plan partitions="2">
 <properties partition="0">
 <property name="start" value="1"/>
 <property name="end" value="10"/>
 </properties>
 <properties partition="1">
 <property name="start" value="11"/>
 <property name="end" value="20"/>
 </properties>
 </plan>
 </partition>
 </step>!
89 #46: Batch: Creating Workflows <flow id="flow1" next="step3">
 <step id="step1" next="step2"> . . . </step>
 <step id="step2"> . . . </step>
 </flow>
 <step id="step3"> . . . </step>! Flow: Elements that execute together as a unit
90 #46: Batch: Creating Workflows <split id="split1" next=" . . . ">
 <flow id="flow1”>
 <step id="step1”> . . . </step>
 </flow>
 <flow id="flow2”>
 <step id="step2”> . . . </step>
 </flow>
 </split>! Split: Concurrent execution of flows
91 #46: Batch: Creating Workflows <step id="step1" next="decider1">. . .</step>
 <decision id="decider1" ref="myDecider"> 
 <next on="DATA_LOADED" to="step2"/> 
 <end on="NOT_LOADED"/> </decision>
 <step id="step2">. . .</step> ! ! Decision: Customized way of sequencing between steps, flows, splits @Named
 public class MyDecider implements Decider {
 @Override
 public String decide(StepExecution[] ses) throws Exception {
 . . .
 return "DATA_LOADED"; // or "NOT_LOADED"! } ! }!
92 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JavaMail 1.5 (JSR 919)
93 #47: JavaMail @MailSessionDefinition(name = "java:comp/myMailSession",
 properties = {
 "mail.smtp.host=smtp.gmail.com",
 "mail.smtp.ssl.enable=true",
 "mail.smtp.auth=true",
 "mail.transport.protocol=smtp",
 "mail.debug=true"
 })
 
 
 @Resource(lookup = "java:comp/myMailSession")
 Session session;!
94 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JCA 1.7 (JSR 322)
95 #48: Java Connector Architecture @ConnectionDefinition(
 connection="MyConnection.class",
 connectionImpl="MyConnectionImpl.class",
 connectionFactory="MyConnectionFactory.class",
 connectionFactoryImpl="MyConnectionFactoryImpl.class"
 )
 ! @AdministeredObjectDefinition(
 className="MyQueueImpl.class",
 name="java:comp/MyQueue",
 resourceAdapter="myAdapter",
 )!
96 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Java EE 7 (JSR 342)
97 #49: Default Resources JNDI name: java:comp/DefaultDataSource Default Data Source @Resource(lookup="java:comp/DefaultDataSource")
 DataSource myDS;
 ! @Resource
 DataSource myDS; !
98 #49: Default Resources JNDI name: java:comp/DefaultJMSConnectionFactory
 
 @Resource(lookup="java:comp/DefaultJMSConnectionFactory”)
 ConnectionFactory myCF; @Resource
 ConnectionFactory myCF;! Default JMS Connection Factory
99 #49: Default Resources JNDI names java:comp/DefaultManagedExecutorService! java:comp/DefaultManagedScheduledExecutorService! java:comp/DefaultManagedThreadFactory! java:comp/DefaultContextService! Default Concurrency Utilities Objects
100 #50: Buy our books!
101 References github.com/javaee-samples/javaee7-samples github.com/javaee-samples/javaee7-hol
102

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50 features of Java EE 7 in 50 minutes at Geecon 2014

  • 1. 1 50 features of Java EE 7 in 50 minutes Arun Gupta, @arungupta
  • 3. 3 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5
  • 4. 4 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 CDI 1.1 (JSR 346)
  • 5. 5 #01: CDI: Default enabling Finer scanning control Possible values: all, annotated, none! Annotated behaves like in Java EE 6 (default)! ! <beans ... version="1.1" bean-discovery-mode="all">! <alternatives>! <class>org.agoncal.book.MockGenerator</class>! </alternatives>! </beans>!
  • 6. 6 #02: CDI: @Vetoed Veto the processing of the class or package @Vetoed! public class NonProcessedBean {
 ...! }! ! package-info.java @Vetoed! package com.non.processed.package;!
  • 7. 7 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Bean Validation 1.1 (JSR 349)
  • 8. 8 #03: Bean Validation: Method validation public class CardValidator {! ! public CardValidator(@NotNull Algorithm algorithm) {! this.algorithm = algorithm;! }! ! @AssertTrue! public Boolean validate(@NotNull CreditCard creditCard) {! return algorithm.validate(creditCard.getNumber());! }! }! Pre/post conditions on method and constructors
  • 9. 9 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Interceptors 1.2 (JSR 318)
  • 10. 10 #04: Interceptors: AroundConstruct Interceptor associated with a constructor public class LoggingInterceptor {! ! @AroundConstruct! private void init(InvocationContext ic) 
 throws Exception{! logger.fine("Entering constructor");! ic.proceed();! logger.fine("Exiting constructor");! }! ! @AroundInvoke! public Object logMethod(InvocationContext ic) ... { // ...! }! }!
  • 11. 11 #05: Interceptors: @Priority Prioritizing interceptor bindings PLATFORM_BEFORE (0), LIBRARY_BEFORE (1000), APPLICATION (2000), LIBRARY_AFTER (3000), PLATFORM_AFTER (4000)! @Interceptor! @Loggable! @Priority(Interceptor.Priority.LIBRARY_BEFORE + 10)! public class LoggingInterceptor {! ! @AroundInvoke! ...! }!
  • 12. 12 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Concurrency Utilities 1.0 (JSR 236)
  • 13. 13 #06: Concurrency: ManagedExecutor User threads in Java EE applications Support simple and advance concurrency design patterns Extend Concurrency Utilities API from Java SE (JSR 166y) java.util.concurrent package
  • 14. 14 #06: Concurrency: ManagedExecutor @Resource
 ManagedExecutorService executor;
 ! 
 ManagedExecutorService executor = 
 (ManagedExecutorService) ctx
 .lookup("java:comp/DefaultManagedExecutorService");! Default ManagedExectuor
  • 15. 15 #06: Concurrency: ManagedExecutor <web-app … version="3.1">! <resource-env-ref>! <resource-env-ref-name>! concurrent/myExecutor! </resource-env-ref-name>! <resource-env-ref-type>! javax.enterprise.concurrent.ManagedExecutorService! </resource-env-ref-type>! </resource-env-ref>! </web-app>! Specify in web.xml
  • 16. 16 #07: Concurrency: ManagedScheduledExecutor Managed version of ScheduledExecutorService! Submit delayed or periodic tasks @Resource
 ManagedScheduledExecutorService executor;!
  • 17. 17 #07: Concurrency: ManagedScheduledExecutor InitialContext ctx = new InitialContext(); 
 
 ManagedScheduledExecutorService executor = (ManagedScheduledExecutorService)ctx.lookup(
 "java:comp/DefaultManagedScheduledExecutorService");
 ! Can be defined in web.xml as well Access using JNDI
  • 18. 18 #07: Concurrency: ManagedScheduledExecutor executor.schedule(new MyCallableTask(), 5, TimeUnit.SECONDS);! executor.scheduleAtFixedRate(new MyRunnableTask(), 2, 3, TimeUnit.SECONDS);! executor.scheduleWithFixedDelay(new MyRunnableTask(), 2, 3, TimeUnit.SECONDS);!
  • 19. 19 #08: Concurrency: ManagedThreadFactory Extends ThreadFactory @Resource(name = "DefaultManagedThreadFactory")
 ManagedThreadFactory factory; ManagedThreadFactory factory = (ManagedThreadFactory) ctx.lookup("java:comp/DefaultManagedThreadFactory");

  • 20. 20 #08: Concurrency: ManagedThreadFactory Thread thread = factory.newThread(new MyTask()); ((ManageableThread)thread).isShutdown();

  • 21. 21 #09: Concurrency: DynamicProxy Create dynamic proxy objects, adds contextual information available for applications running in Java EE environment Classloading, JNDI, Security, …
  • 22. 22 #09: Concurrency: DynamicProxy @Resource
 ContextService service;
 
 
 Runnable proxy = service.createContextualProxy(new MyRunnable(), Runnable.class);
 
 
 Future f = executor.submit(proxy);!
  • 23. 23 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JPA 2.1 (JSR 338)
  • 24. 24 #10: JPA: Schema Generation Standardized database schema generation <persistence ... version="2.1">! <persistence-unit ...>! <properties>! <property
 name="javax.persistence.schema-generation.scripts.action”! value="drop-and-create"/>! <property
 name="javax.persistence.schema-generation.scripts.create-target" value="create.sql"/>! <property name="javax.persistence.sql-load-script-source" ! value="insert.sql"/>! </properties>! </persistence-unit>!
  • 25. 25 #11: JPA: @Index Defines additional indexes in schema generation @Entity! @Table(indexes = {! @Index(columnList = "ISBN"),! @Index(columnList = "NBOFPAGE")! })! public class Book {! ! @Id @GeneratedValue! private Long id;! private String isbn;! private Integer nbOfPage;! ...! }!
  • 26. 26 #12: JPA: Unsynchronized PC Persistence context is not enlisted in any tx unless explicitly joined @PersistenceContext(synchronization =! SynchronizationType.UNSYNCHRONIZED)! private EntityManager em;! ...! ! em.persist(book);! ! ...! em.joinTransaction();! !
  • 27. 27 #13: JPA: Stored Procedure Calling a stored procedure @Entity! @NamedStoredProcedureQuery(name = "archiveOldBooks", ! procedureName = "sp_archive_books",! parameters = {! @StoredProcedureParameter(name = ”date", mode = IN, ! type = Date.class),! @StoredProcedureParameter(name = "warehouse", mode = IN, type = String.class)! })! public class Book {...}!
  • 28. 28 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JTA 1.2 (JSR 907)
  • 29. 29 #14: JTA: @Transactional Transaction management on Managed Beans as CDI interceptor binding @Path("book")! @Transactional(value = Transactional.TxType.REQUIRED,! rollbackOn = {SQLException.class, JMSException.class},! dontRollbackOn = SQLWarning.class)! public class BookRestService {! ! @PersistenceContext! private EntityManager em;! ! @POST! @Consumes(MediaType.APPLICATION_XML)! public Response createBook(Book book) {...}! }!
  • 30. 30 #15: JTA: @TransactionScoped CDI scope whose lifecycle is scoped to the currently active JTA transaction @TransactionScoped! public class BookBean {...}! ! @WebServlet! public class TxServlet extends HttpServlet {! @Inject UserTransaction tx;! @Inject BookBean b1;! @Inject BookBean b2;! ! protected void processRequest(...) {! tx.begin();! s_out.println(b1.getReference());! s_out.println(b2.getReference());! tx.commit();! }! }!
  • 31. 31 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 EJB 3.2 (JSR 345)
  • 32. 32 #16: EJB: Disable passivation of stateful @Stateful(passivationCapable = false)! public class ShoppingCart {! ...! }! In some cases increases performance, scalability and robustness
  • 33. 33 #17: EJB-Lite: Async + Non-persistent timer @Stateless! public class OrderEJB {! ! @Asynchronous! public void sendEmail (Order order) {! // Very Long task! }! ! @Schedule(hour="2", persistent=false)! public void createDailyReport() {! // ...! }! }! Extended the EJB Lite to include local asynchronous invocations and non-persistent EJB Timer Service
  • 34. 34 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JMS 2.0 (JSR 343)
  • 35. 35 #18: JMS: JMSContext API New simplified API to produce and consume messages @Inject JMSContext ctx;! ! ctx.createProducer().send(queue, "Text message sent");! ! ctx.createConsumer(queue).receiveBody(String.class);! ! ctx.createProducer()! .setPriority(2)! .setTimeToLive(1000)! .setDeliveryMode(DeliveryMode.NON_PERSISTENT)! .send(queue, message);!
  • 36. 36 #19: JMS: Autocloseable Several JMS interfaces implement Autocloseable try (JMSContext ctx = connectionFactory.createContext()) {! ctx.createProducer().send(queue, "Text message sent");! }! ! ...! ! try (JMSContext ctx = connectionFactory.createContext()) {! while (true) {! String s = ctx.createConsumer(queue).receiveBody(String.class);! }! }!
  • 37. 37 #20: JMS: JMSConnectionFactoryDefinition @Stateless! @JMSConnectionFactoryDefinition(! name = "java:app/jms/MyConnectionFactory",! interfaceName = "javax.jms.TopicConnectionFactory")! ! ! ! public class ExpensiveOrderEJB {...}! A JMS ConnectionFactory can be defined using an annotation on a container-managed class
  • 38. 38 #21: JMS: JMSDestinationDefinition A JMS queue or topic can be defined using an annotation @Stateless! @JMSConnectionFactoryDefinition(! name = "java:app/jms/MyConnectionFactory",! interfaceName = "javax.jms.TopicConnectionFactory")! @JMSDestinationDefinition(! name = "java:app/jms/MyTopic",! interfaceName = "javax.jms.Topic")! public class ExpensiveOrderEJB {...}!
  • 39. 39 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Servlet 3.1 (JSR 340)
  • 40. 40 #22: Servlet: Non-blocking I/O public class TestServlet extends HttpServlet
 protected void doGet(HttpServletRequest request,
 HttpServletResponse response) 
 throws IOException, ServletException {
 ServletInputStream input = request.getInputStream();
 byte[] b = new byte[1024];
 int len = -1;
 while ((len = input.read(b)) != -1) {
 . . .
 }
 }
 }!
  • 41. 41 #22: Servlet: Non-blocking I/O ServletInputStream! public void setReadListener(ReadListener listener);! public boolean isFinished();! public boolean isReady();! ServletOutputStream! public setWriteListener(WriteListener listener);! public boolean canWrite();! New methods to existing interfaces
  • 42. 42 #22: Servlet: Non-blocking I/O public interface ReadListener extends EventListener {
 public void onDataAvailable();
 pubic void onAllDataRead();
 public void onError();
 }! public interface WriteListener extends EventListener {
 public void onWritePossible();
 public void onError();
 }! New interfaces
  • 43. 43 #22: Servlet: Non-blocking I/O AsyncContext context = request.startAsync();
 ServletInputStream input = request.getInputStream();
 input.setReadListener(
 new MyReadListener(input, context)); ! Only for Asynchronous Servlets
  • 44. 44 #23: Servlet: Protocol Upgrade <T extends HttpUpgradeHandler> T HttpServletRequest.upgrade(Class<T> class) throws IOException;
 
 
 ! HttpUpgradeHandler! init(WebConnection wc);! destroy();!
  • 45. 45 #23: Servlet: Protocol Upgrade public interface WebConnection {
 ServletInputStream getInputStream();
 ServletOutputStream getOutputStream();
 }!
  • 46. 46 #24: Servlet: Improved Security <web-app . . . version="3.1"> 
 <web-resource-collection>
 <url-pattern>/account/*</url-pattern> 
 <http-method>GET</http-method>
 </web-resource-collection>
 <auth-contraint>
 . . .
 </auth-contraint>
 </web-app> ! ! Deny an HTTP method request for an uncovered HTTP method
  • 47. 47 #24: Servlet: Improved Security <web-app . . . version="3.1"> 
 <deny-uncovered-http-methods/>
 <web-resource-collection>
 <url-pattern>/account/*</url-pattern> 
 <http-method>GET</http-method>
 </web-resource-collection>
 <auth-contraint>
 . . .
 </auth-contraint> 
 </web-app> ! ! Deny an HTTP method request for an uncovered HTTP method
  • 48. 48 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Web Socket 1.0 (JSR 356)
  • 49. 49 #25: WebSocket: Annotated server endpoint Enables full-duplex bi-directional communication over single TCP connection @javax.websocket.server.ServerEndpoint("/chat")
 public class ChatServer {
 
 @OnMessage
 public String chat(String name, Session session) {
 for (Session peer : client.getOpenSessions()) {! peer.getBasicRemote().sendObject(message);! }
 }
 }!
  • 50. 50 #26: WebSocket: Lifecycle callbacks @javax.websocket.OnOpen
 public void open(Session s) { . . . }
 
 @javax.websocket.OnClose
 public void close(CloseReason c) { . . . }
 
 @javax.websocket.OnError
 public void error(Throwable t) { . . . }!
  • 51. 51 #27: WebSocket: Annotated client endpoint @javax.websocket.ClientEndpoint
 public class MyClient {
 @javax.websocket.OnOpen
 public void open(Session session) { … }
 
 // Lifecycle callbacks
 }!
  • 52. 52 #27: WebSocket: Annotated client endpoint ContainerProvider
 .getWebSocketContainer()
 .connectToServer(
 MyClient.class, 
 URI.create("ws://. . ."));!
  • 53. 53 #28: WebSocket: Programmatic endpoints public class ChatServer extends Endpoint {
 @Override
 public void onOpen(Session s, EndpointConfig ec) {
 s.addMessageHandler(new MessageHandler.Whole<String>() { public void onMessage(String text) { . . . }
 }
 }
 
 @Override
 public void onClose(Session s, CloseReason cr) { . . . }
 
 //. . . 
 }!
  • 54. 54 #28: WebSocket: Programmatic endpoints public class MyApplicationConfig implements ServerApplicationConfig {
 public Set<ServerEndpointConfig> getEndpointConfigs(…) { 
 ServerEndpointConfig.Builder
 .create(MyEndpoint.class, "/websocket”)
 .configurator(new MyConfig())
 .build()
 }
 }!
  • 55. 55 #28: WebSocket: Programmatic endpoints public class MyConfig extends ServerEndpointConfig.Configurator {
 
 public <T> T getEndpointInstance(. . .) { . . . }
 
 public void modifyHandshake(. . .) { . . . }
 
 . . .
 }!
  • 56. 56 #29: WebSocket: Encoder and Decoder @javax.websocket.server.ServerEndpoint(
 value="/chat",
 decoders="MyDecoder.class",
 encoders="MyEncoder.class")
 public class ChatServer {
 
 @OnMessage
 public String chat(ChatMessage name, Session session) {
 . . . 
 }
 }!
  • 57. 57 #29: WebSocket: Encoder and Decoder public class MyDecoder implements Decoder.Text<ChatMessage> {
 public ChatMessage decode(String s) {
 // . . .
 }
 
 public boolean willDecode(String string) {
 // . . .
 }
 
 //. . .
 }
 
 !
  • 58. 58 #29: WebSocket: Encoder and Decoder public class MyEncoder implements Encoder.Text<ChatMessage> {
 
 public String encode(ChatMessage chatMessage) {
 // . . .
 }
 ! // . . .
 }!
  • 59. 59 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Expression Language 3.0 (JSR 341)
  • 60. 60 #30: Expression Langauge: ELProcessor Use EL in a stand-alone environment Evaluate EL expressions Defining a static method as an EL function Defining an object instance as an EL name ELProcessor elp = new ELProcessor();
 elp.defineBean("employee", new Employee("Charlie Brown"));
 String name = elp.eval("employee.name");!
  • 61. 61 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JSF 2.2 (JSR 344)
  • 62. 62 #31: JSF: Faces Flow ./src/main/webapp/flow1
 /flow1.xhtml
 /flow1a.xhtml
 /flow1b.xhtml
 ./src/main/webapp/flow2
 /flow2-flow.xml
 /flow2.xhtml
 /flow2a.xhtml
 /flow2b.xhtml
 /index.xhtml! Package reusable flows in JAR
  • 63. 63 #31: JSF: Faces Flow @Named
 @FlowScoped("flow1")
 public class Flow1Bean implements Serializable {
 }! ! @Produces @FlowDefinition
 public Flow defineFlow(@FlowBuilderParameter FlowBuilder fb) {
 String flowId = "flow1";
 //. . .
 return fb.getFlow();
 }! Package reusable flows in JAR
  • 64. 64 #31: JSF: Faces Flow #{flowScope}: Local flow storage #{facesContext.application.flowHandler.currentFlow}: Returns true if within a flow Package reusable flows in JAR
  • 65. 65 #32: JSF: Resource Library Contract index-blue.xhtml
 index-red.xhtml
 WEB-INF/lib/contracts-library-1.0-SNAPSHOT.jar
 /META-INF/contracts/blue
 /style.css
 /javax.faces.contract.xml
 /template.xhtml
 /META-INF/contracts/red
 /style.css
 /javax.faces.contract.xml
 /template.xhtml! Apply templates in a reusable and interchangeable manner
  • 66. 66 #32: JSF: Resource Library Contract <f:view contracts=”red”>
 <ui:composition template="/template.xhtml">
 . . .
 </ui:composition>
 </f:view>
 ! Apply templates in a reusable and interchangeable manner
  • 67. 67 #33: JSF: Pass-through Attributes <h:inputText type="email" value="#{user.email}"/> 
 ! <input type="text" name="j_idt6:j_idt10"/>! HTML5-Friendly Markup <h:inputText p:type="email" value="#{user.email}"/> 
 
 <input type="email" name="j_idt6:j_idt10"/>! !
  • 68. 68 #34: JSF: File Upload Component <h:form enctype="multipart/form-data">
 <h:inputFile value="#{fileUploadBean.file}"/><br/>
 <h:commandButton value="Upload"/><p/>
 </h:form> ! @Named @RequestScoped 
 public class FileUploadBean {
 private Part file;
 
 //getter and setter
 } !
  • 69. 69 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JAX-RS 2.0 (JSR 339)
  • 70. 70 #35: JAX-RS: Client API Client client = ClientBuilder.newClient();! WebTarget target = client.target("http://www.foo.com/ book");! Invocation invocation = target.request(TEXT_PLAIN).buildGet();! Response response = invocation.invoke();! ! Response response = ClientBuilder.newClient()! .target("http://www.foo.com/book")! .request(MediaType.TEXT_PLAIN)! .get();! ! String body = ClientBuilder.newClient()! .target("http://www.foo.com/book")! .request()! .get(String.class);! New API to consume rest services
  • 71. 71 #36: JAX-RS: Async Client Future<String> future = ClientBuilder.newClient()! .target("http://www.foo.com/book")! .request()! .async()! .get(String.class);! ! try {! String body = future.get(1, TimeUnit.MINUTES);! } catch (InterruptedException | ExecutionException e) { . . .
 }! The client API also supports asynchronous invocation
  • 72. 72 #37: JAX-RS: Async Server @Path("/async")! public class AsyncResource {! ! @GET! public void asyncGet(@Suspended AsyncResponse asyncResp) {! ! new Thread(new Runnable() {! ! public void run() {! String result = veryExpensiveOperation();! asyncResp.resume(result);! }! }).start();! }}! Asynchronous request processing on the server
  • 73. 73 #38: JAX-RS: Message Filter Filters on client side ClientRequestFilter! ClientResponseFilter! Filters on server side ContainerRequestFilter! ContainerResponseFilter! Used to process incoming and outgoing request or response headers
  • 74. 74 #38: JAX-RS: Message Filter public class LogginFilter implements ClientRequestFilter {! ! public void filter(ClientRequestContext ctx) throws IOException {! System.out.println(ctx.getMethod());! System.out.println(ctx.getUri());! }! }! Used to process incoming and outgoing request or response headers
  • 75. 75 #39: JAX-RS: Entity Interceptors Intercepts inbound entity streams (reads from the “wire”) ReaderInterceptor! Intercepts outbound entity streams (writes to the “wire”) WriterInterceptor! Marshalling and unmarshalling HTTP message bodies
  • 76. 76 #39: JAX-RS: Entity Interceptors public class GZipInterceptor implements WriterInterceptor {! ! public void aroundWriteTo(WriterInterceptorContext ctx){! OutputStream os = ctx.getOutputStream();! ctx.setOutputStream(new GZIPOutputStream(os));! ctx.proceed();! }! }! Marshalling and unmarshalling HTTP message bodies
  • 77. 77 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JSON-P 1.0 (JSR 353)
  • 78. 78 #40: JSON-P: JSON Builder JsonObject value = Json.createObjectBuilder()! .add("id", "1234")! .add("date", "19/09/2012")! .add("total_amount", "93.48")! .add("customer", Json.createObjectBuilder()! .add("first_name", "James")! .add("last_name", "Rorrison")! .add("email", "j.rorri@me.com")! .add("phoneNumber", "+44 12341234")! )! .build();! Creates an object model (or an array) in memory by adding elements
  • 79. 79 #41: JSON-P: JsonParser JsonParser parser = Json.createParser(new FileReader(“order.json"));! while (parser.hasNext()) {! JsonParser.Event event = parser.next();! ! if (event.equals(JsonParser.Event.KEY_NAME) && ! parser.getString().matches("email")) {! parser.next();! email = parser.getString();! }! }! Event-based parser that can read JSON data from a stream
  • 80. 80 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Batch 1.0 (JSR 352)
  • 81. 81 #42: Batch: Chunk-style Processing Item-oriented Processing Style (primary)
  • 82. 82 #42: Batch: Chunk-style Processing <step id=”sendStatements”>! <chunk item-count=“3”>
 <reader ref=”accountReader”/>! <processor ref=”accountProcessor”/>
 <writer ref=”emailWriter”/>! </step>! …implements ItemReader {
 public Object readItem() {
 // read account using JP }! ! …implements ItemProcessor {! public Object processItems(Object account) {
 // read Account, return Statement! }! ! …implements ItemWriter {! public void writeItems(List accounts) {
 // use JavaMail to send email! }! !
  • 83. 83 #43: Batch: Batchlet-style Processing Task-oriented processing style <step id=”transferFile”>! <batchlet ref=“MyFileTransfer” />! </step>! …implements Batchlet {! @Override
 public void process() {
 // Transfer file! }! !
  • 84. 84 #44: Batch: Job/Step/Chunk Listeners <job id="myJob" xmlns="http://xmlns.jcp.org/xml/ns/javaee" version="1.0”>
 <listeners>
 <listener ref="myJobListener"/>
 </listeners>
 <step id="myStep" >
 <listeners>
 <listener ref="myStepListener"/>
 <listener ref="myChunkListener"/>
 <listener ref="myItemReadListener"/>
 <listener ref="myItemProcessorListener"/>
 <listener ref="myItemWriteListener"/>
 </listeners>
 <chunk item-count="3”>. . .</chunk>
 </step>
 </job>! !
  • 85. 85 #44: Batch: Job/Step/Chunk Listeners Interface Abstract Classes JobListener! AbstractJobListener! StepListener! AbstractStepListener! ChunkListener! AbstractChunkListener! ItemRead/Write/ ProcessListener! AbstractItemRead/Write/ ProcessListener! SkipRead/Write/ ProcessListener! AbstractSkipRead/Write/ ProcessListener! RetryRead/Write/ ProcessListener! AbstractRetryRead/Write/ ProcessListener!
  • 86. 86 #44: Batch: Job/Step/Chunk Listeners @Named
 public class MyJobListener extends AbstractJobListener {
 
 @Override
 public void beforeJob() throws Exception { . . . }
 
 @Override
 public void afterJob() throws Exception { . . . }
 }!
  • 87. 87 #45: Batch: Partition <step>
 <chunk item-count="3">
 <reader ref="myItemReader">
 <properties>
 <property name="start" value="#{partitionPlan['start']}"/>
 <property name="end" value="#{partitionPlan['end']}"/>
 </properties> 
 </reader>
 . . .
 </chunk>!
  • 88. 88 #45: Batch: Partition <partition>
 <plan partitions="2">
 <properties partition="0">
 <property name="start" value="1"/>
 <property name="end" value="10"/>
 </properties>
 <properties partition="1">
 <property name="start" value="11"/>
 <property name="end" value="20"/>
 </properties>
 </plan>
 </partition>
 </step>!
  • 89. 89 #46: Batch: Creating Workflows <flow id="flow1" next="step3">
 <step id="step1" next="step2"> . . . </step>
 <step id="step2"> . . . </step>
 </flow>
 <step id="step3"> . . . </step>! Flow: Elements that execute together as a unit
  • 90. 90 #46: Batch: Creating Workflows <split id="split1" next=" . . . ">
 <flow id="flow1”>
 <step id="step1”> . . . </step>
 </flow>
 <flow id="flow2”>
 <step id="step2”> . . . </step>
 </flow>
 </split>! Split: Concurrent execution of flows
  • 91. 91 #46: Batch: Creating Workflows <step id="step1" next="decider1">. . .</step>
 <decision id="decider1" ref="myDecider"> 
 <next on="DATA_LOADED" to="step2"/> 
 <end on="NOT_LOADED"/> </decision>
 <step id="step2">. . .</step> ! ! Decision: Customized way of sequencing between steps, flows, splits @Named
 public class MyDecider implements Decider {
 @Override
 public String decide(StepExecution[] ses) throws Exception {
 . . .
 return "DATA_LOADED"; // or "NOT_LOADED"! } ! }!
  • 92. 92 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JavaMail 1.5 (JSR 919)
  • 93. 93 #47: JavaMail @MailSessionDefinition(name = "java:comp/myMailSession",
 properties = {
 "mail.smtp.host=smtp.gmail.com",
 "mail.smtp.ssl.enable=true",
 "mail.smtp.auth=true",
 "mail.transport.protocol=smtp",
 "mail.debug=true"
 })
 
 
 @Resource(lookup = "java:comp/myMailSession")
 Session session;!
  • 94. 94 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 JCA 1.7 (JSR 322)
  • 95. 95 #48: Java Connector Architecture @ConnectionDefinition(
 connection="MyConnection.class",
 connectionImpl="MyConnectionImpl.class",
 connectionFactory="MyConnectionFactory.class",
 connectionFactoryImpl="MyConnectionFactoryImpl.class"
 )
 ! @AdministeredObjectDefinition(
 className="MyQueueImpl.class",
 name="java:comp/MyQueue",
 resourceAdapter="myAdapter",
 )!
  • 96. 96 JAX-RS 2.0 JSON-P 1.0Web Socket 1.0 Servlet 3.1 JSF 2.2EL 3.0 JSP JSTL BeanValidation1.1 Interceptors1.2 CDI1.1 Concurrency1.0 JPA 2.1 JTA 1.2 EJB 3.2 JMS 2.0 Batch 1.0 JCA 1.7 Java EE 7 JavaMail 1.5 Java EE 7 (JSR 342)
  • 97. 97 #49: Default Resources JNDI name: java:comp/DefaultDataSource Default Data Source @Resource(lookup="java:comp/DefaultDataSource")
 DataSource myDS;
 ! @Resource
 DataSource myDS; !
  • 98. 98 #49: Default Resources JNDI name: java:comp/DefaultJMSConnectionFactory
 
 @Resource(lookup="java:comp/DefaultJMSConnectionFactory”)
 ConnectionFactory myCF; @Resource
 ConnectionFactory myCF;! Default JMS Connection Factory
  • 99. 99 #49: Default Resources JNDI names java:comp/DefaultManagedExecutorService! java:comp/DefaultManagedScheduledExecutorService! java:comp/DefaultManagedThreadFactory! java:comp/DefaultContextService! Default Concurrency Utilities Objects
  • 100. 100 #50: Buy our books!
  • 102. 102