Java EE 7: Developing for the Cloud at Geecon, JEEConf, Johannesburg

1. Main sponsor The Java EE 7 Pla,orm: Developing for the Cloud Arun Gupta, Java EE & GlassFish Guy blogs.oracle.com/arungupta, @arungupta

2. The following is intended 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. 2 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

4. Java EE 6 – Key Statistics •  40+ Million Java EE 6 Component Downloads •  #1 Choice for Enterprise Developers •  #1 Application Development Platform •  Fastest implementation of a Java EE release 4 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

5. Top Ten Features in Java EE 6 1.  EJB packaging in a WAR 2.  Servlet and CDI extension points 3.  Optional web.xml! 4.  Type-safe dependency injection 5.  CDI Events 6.  JSF standardizing on Facelets 7.  EJBContainer API 8.  @Schedule! 9.  EJB No Interface View 10. Web Profile 5 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

8. Java EE 7 and 8 – Focus Areas Cloud Modularity HTML5 •  Provisioning •  Building on Jigsaw •  Emerging Web Standards require a •  Elastic & Autonomic •  Focus on OSGi interop programming model Scalability •  Supporting Profiles & •  JSON, WebSockets, •  Multi-Tenancy Modular Applications off-line, APIs & DOM 8 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

9. Java EE 7 Focus: Platform as a Service •  Next logical step for Java EE –  J2EE à Java EE 6 : The Java EE Platform provides services –  Java EE 7 : The Java EE Platform IS a service •  PaaS support entails evolutionary change •  Basic form of SaaS •  Provide way for customers and users to leverage public, private, and hybrid clouds 9 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

10. Roles Developer PaaS Provider PaaS Customer/ JVM JVM JVM JVM JVM JVM JVM JVM JVM Tenant Machine Machine Machine PaaS Product Provider JVM JVM JVM JVM JVM JVM JVM JVM JVM Deployer Machine Machine Machine PaaS Account Tenant 1 Tenant 2 Tenant 3 Manager Application Submitter PaaS Administrator Application Administrator 10 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

11. Existing Java EE model Database 1 Provision and Initialize Service •  Configure Java EE resources – JDBC, JMS etc LDAP 2 Service •  Deploy Application EAR Provision and Initialize Messaging 3 Provision and Initialize Service Application 4 Provision and Initialize Container 5 Deploy Application (EAR/ GAR/SAR …) 11 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

12. Java EE 7 Model: Auto-Provision Services from Application Dependencies Cloud Administration •  Provision and deploy application 1 Provision and Initialize Service resources (e.g. LDAP stripe, data source instantiation and Database 2 Service connection …) Provision and Initialize •  Extensible Deployment Models LDAP Supporting Multiple Frameworks 3 Provision and Initialize Service •  Spring, Seam, Play … Messaging 4 Provision and Initialize Service Application 5 Deploy Application (EAR/ GAR/SAR …) Container 12 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

13. Services •  Cloud apps consume services –  Persistence, queueing, mail, caching, … •  Service metadata facilitates ease of use when deploying into the cloud @DataSourceDefinition(! name=“java:app/jdbc/myDB”,! className=“oracle.jdbc.pool.OracleDataSource”,! isolationLevel=TRANSACTION_REPEATABLE_READ,! initialPoolSize=5! ) ! 13 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

14. Services •  Cloud apps consume services –  Persistence, queueing, mail, caching, … •  Service metadata facilitates ease of use when deploying into the cloud @JMSConnectionFactoryDefinition(  name=“java:app/myJMSConnectionFactory”, className=“javax.jms.QueueConnectionFactory”  resourceAdapterName=“myJMSRA”) ! ! @JMSDestinationDefinition(  name=“java:app/myQueue”,  className=“javax.jms.Queue”  destinationName=“myQueue1”)! 14 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

15. Services •  Cloud apps consume services –  Persistence, queueing, mail, caching, … •  Service metadata facilitates ease of use when deploying into the cloud @MailSessionDefinition(! name=“java:app/mailSession”,  host=“example.com”  from=“MyService@example.com”! ) ! 15 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

16. Services •  Cloud apps consume services –  Persistence, queueing, mail, caching, … •  Service metadata facilitates ease of use when deploying into the cloud @ConnectorResourceDefinition(! name=“java:app/myCustomConnector”,! className=“com.extraServices.CustomConnector.class”,! properties= {…}! ) ! 16 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

17. Resource/Service Metadata •  Which service ? –  Application require an instance, not a particular one –  Application require a particular instance, with specific properties •  Services scoped to application, or shareable •  Quality-of-service attributes such as pool size, elasticity •  Usecases –  Need only SQL and JTA transactions; use PaaS platform defaults –  Needs Oracle database, initial/minimum/maximum poolsize, JNDI name –  Pre-provisioned MySQL, JNDI name, host/port –  Apps sharing JMS queues by referring to global JNDI name 17 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

18. Elasticity Java EE 7 Focus: Move the Bar Right Elasticity Continuum Java EE Cluster Elastic Cluster Elastic Cluster Capacity Ca on Demand Single node Java EE Multi-Node Dynamic Self Adjusting Non-Elastic Multi-Instance Clustering SLA Driven Elasticity •  Service Levels •  Minimum and Maximum Instances •  Futures – Self Adjustment, Capacity On Demand 18 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

19. Example Scenario “A software company writes an application, submits it to a PaaS provider, then any number of tenants sign up for the application, deploy it, their end users access it” 19 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

30. Walkthrough (11) ExtraServices DiabloCloud End-‐Users Access the application Provisioned and Deployed App Administrator Administers the application 30 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

31. Walkthrough (12) ExtraServices DiabloCloud System Administrator Monitors End-‐Users Access the application Provisioned and Deployed App Administrator Administers the application 31 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

33. Conference Planning in the Cloud Java EE Application JSF JPA Deploy Services EJB Metadata <glassfish-services>  <service-description init-type="LB" name="ConferencePlanner-lb">  <template id="LBNative"/>  <configurations>  <configuration name="https-port" value="50443"/>  <configuration name="ssl-enabled" value="false"/>  <configuration name="http-port" value="50080"/>  </configurations></service-description>  <service-description init-type="JavaEE" name="ConferencePlanner">  <characteristics>  <characteristic name="service-type" value="JavaEE"/>  </characteristics>  <configurations>  <configuration name="max.clustersize" value="4"/>  <configuration name="min.clustersize" value="2"/>  </configurations>  </service-description>! . . .  </glassfish-services>! 33 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

35. Multi-tenancy in Java EE 7 •  Support for separate isolated instances of the same app for different tenants –  One application instance per tenant –  Tenants correspond to units of isolation –  Multitenant apps are declared as such –  Each instance customized and deployed for a single tenant –  Limited form of SaaS •  Mapping to tenant done by the container •  Tenant id available to application –  E.g., under java:comp/tenantId! 35 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

36. Java EE 7 Is Not Just Cloud-y •  Alignment of ManagedBeans across CDI, EJB, JSF, … –  POJO à ManagedBean à Enterprise JavaBean –  Extension of container-managed transactions beyond EJB •  Further simplifications for ease-of-development –  JAX-RS 2.0 Client API, hypermedia, bean validation, … –  JMS 2.0 focus on ease-of-development –  Expanded use of dependency injection –  Expanded service metadata; improved configuration •  Pruning –  EJB CMP and BMP, JAX-RPC, Deployment API •  Update to Web Profile 36 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

37. Java EE 7 – Candidate JSRs Web JAX-RS JSF 2.2 Jcache 1.0 Container EL 3.0 (JSR 107) CDI Extensions 2.0 JSP 2.2 Extensions Bean Validation 1.1 Concurrency Servlet 3.1 Utilities 1.0 (JSR 236) State CDI 1.1 / Interceptors 1.1 / JSR 250 1.1 Management 1.0 (JSR 350) Batch Managed Beans 1.0 EJB 3.2 Processing 1.0 (JSR 352) JSON 1.0 JPA 2.1 JTA 1.1 JMS 2.0 (JSR 353) 37 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

38. Java EE 7 Early Draft •  Requires Java SE 7 •  Added new roles •  Resource definition metadata –  DataSourceDefinition, JMSConnectionFactoryDefinition, JMSDestinationDefinition, MailSessionDefinition, ConnectorResourceDefinition! –  Pre-provisioned or shared resource 38 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

39. Java EE 7 Early Draft •  Default Data Source java:comp/defaultDataSource! •  Default JMS Connection Factory java:comp/ defaultJMSConnectionFactory! •  Tenant Identifier: java:comp/tenantId! •  Made optional –  EJB Entity Beans, EJB QL, JAX-RPC, Deployment API, JAXR 39 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

40. Java Persistence API 2.1 •  @NamedStoredProcedureQuery, StoredProcedureQuery! •  Bulk update/delete using Criteria! •  User-defined functions using FUNCTION! •  Persistence Context Synchronization 40 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

41. JPA 2.1 Stored Procedures @Entity  @NamedStoredProcedureQuery(name="topGiftsStoredProcedure", procedureName="Top10Gifts")  public class Product {  . . .  }! StoredProcedreQuery query = EntityManager.createNamedStoredProcedureQuery("topGiftsStoredProcedure");! query.registerStoredProcedureParameter(1, String.class, ParameterMode.INOUT);! query.setParameter(1, "top10");! query.registerStoredProcedureParameter(2, Integer.class, ParameterMode.IN);! query.setParameter(2, 100);! // there are other setParameter methods for defining the temporal type  . . .! query.execute();! String response = query.getOutputParameterValue(1);! ! 41 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

42. JPA 2.1 Update/Delete using Criteria CriteriaUpdate<Customer> q = cb.createCriteriaUpdate(Customer.class);   Root<Customer> c = q.from(Customer.class);   q.set(c.get(Customer_.status), "outstanding")  .where(cb.lt(c.get(Customer_.balance), 10000));  . . .! @PersistenceContext EntityManager em;  UPDATE Customer c! Query query = em.createQuery(q);  SET c.status = 'outstanding'! query.executeUpdate();  WHERE c.balance < 10000!   ! CriteriaDelete<Customer> q = cb.createCriteriaDelete(Customer.class);   Root<Customer> c = q.from(Customer.class);   q.where(cb.equal(c.get(Customer_.status), "inactive"),  cb.isEmpty(c.get(Customer_.orders)));  . . .! @PersistenceContext EntityManager em;  DELETE FROM Customer c  Query query = em.createQuery(q);  WHERE c.status = 'inactive'  query.executeUpdate();  AND c.orders IS EMPTY!   42 !Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

43. Java API for RESTful Web Services 2.0 •  Client-side API •  Filters and Entity Interceptors •  Client-side and Server-side Async •  Validation •  Server-side content negotiation (qs) •  Hypermedia •  Alignment with CDI 43 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

44. JAX-RS 2.0 Client-side API URL url = new URL("http://.../atm/balance");  HttpURLConnection conn = (HttpURLConnection) url.openConnection();  conn.setRequestMethod("GET");  conn.setDoInput(true);  conn.setDoOutput(false);    BufferedReader br = new BufferedReader(new InputStreamReader(conn.getInputStream()));  String line;  while ((line = br.readLine()) != null) {  out.println(line);  }! Client client = ClientFactory.newClient();! String balance = client.target("http://.../atm/balance")! .request("text/plain")! .get(String.class);! 44 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

45. JAX-RS 2.0 Filters and Interceptors @Provider  class LoggingFilter implements RequestFilter, ResponseFilter {! @Override  public FilterAction preFilter(FilterContext ctx) throws IOException {  logRequest(ctx.getRequest());  return FilterAction.NEXT;  }  ! @Override  public FilterAction postFilter(FilterContext ctx) throws IOException {  logResponse(ctx.getResponse());  return FilterAction.NEXT;  }  }! 45 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

46. JAX-RS 2.0 Client-side Async Client client = ClientFactory.newClient();  Future<String> future = client.target("http://.../atm/{card}/balance")  .pathParam("card", "1111222233334444")  .queryParam("pin", "1234")  .request("text/plain")  .async()  .get(  new InvocationCallback<String>() {  public void completed(String result) {  }    public void failed(InvocationException e) {  }  }  );! 46 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

47. JAX-RS 2.0 Server-side Async @Path("/async")  class ProductResource {  @Context ExecutionContext ctx;  # @GET  @Suspend  public Product longOp() {  Executors.newSingleThreadExecutor().submit(  new Runnable() {  public void run() {  Proruct product = longQueryFromDatabase();  ctx.resume(product);  }  }  );  }  }! 47 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

48. JAX-RS 2.0 Integration with Bean Validation @Path("/")  class ProductResource {! @POST  @Consumes(MediaType.APPLICATION_FORM_URLENCODED)  public void addProduct(@NotNull   @FormParam("productName") String name,  @NotNull   @Category   @FormParam("category") String category) {  . . .  }  }! 48 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

49. JAX-RS 2.0 Server-side Content Negotiation @Path("/")  class ProductResource {! @GET  @Produces({ "text/xml;qs=0.75", "application/json"})  public Product[] getProducts() {  . . .  }  }! 49 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

50. JavaServer Faces 2.2 •  Queue control for Ajax requests •  File Upload component (Non-Ajax & Ajax) •  Injection in all JSF artifacts – including converters & validators •  @FaceletsResourceResolver! •  Instantiating composite components in Java •  . . . 50 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

51. Contexts & Dependency Injection 1.1 •  Embedded mode to startup outside Java EE container •  Global ordering of interceptors and decorators •  API for managing built-in contexts •  Send Servlet events as CDI events •  . . . 51 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

52. Enterprise JavaBeans 3.2 •  Three-part specification –  Core CMT transactions on Managed Beans, Non-persistent timer and Async method to Lite –  Optional CMP, BMP, Entity Beans, EJB QL, JAX-RPC Web service endpoint –  Interceptors 52 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

53. Enterprise JavaBeans 3.2 Under discussion •  Alignment with JMS 2.0 •  QoS – @MaxConcurrency, @Poolsize! •  Non persistent timers and Async invocations in EJB.Lite •  Support for CMT in ManagedBeans –  Subset of transaction attributes –  BMT are already supported using UserTransaction! 53 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

54. Bean Validation 1.1 •  Open: Spec, Reference Implementation, TCK •  Alignment with Dependency Injection •  Method-level validation –  Constraints on parameters and return values –  Check pre-/post-conditions 54 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

55. Bean Validation 1.1 Code Sample @MethodValidated  public class OrderService {   public OrderService(@NotNull CreditCardProcessor creditCardProcessor) { . . . }    public void placeOrder(  @NotNull   @Size(min=3, max=20) String customerCode,   @NotNull @Valid Item item,   @Min(1) int quantity) { . . . }    @NotNull @Size(min=1)  public Set<CreditCardProcessor> getCreditCardProcessors() { ... }    @NotNull @Future  public Date getNextAvailableDeliveryDate() { ... } ! } ! 55 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

56. Java Message Service 2.0 •  Simplified API –  Less verbose –  Reduce the number of objects needed to send/receive message –  Allow resource injection –  Alternative, not replacement, for standard API –  Remove JMSException, where possible •  Connection, Session and other objects are AutoCloseable •  New methods – no need for redundant arguments 56 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

57. JMS 1.1 Sending messages in Java EE @Resource(lookup = "jms/connFactory")  ConnectionFactory cf; ! @Resource(lookup="jms/inboundQueue")! Destination dest;! ! public void sendMessage (String payload) throws JMSException {! Connection conn = cf.createConnection();  Session sess = ! conn.createSession(false,Session.AUTO_ACKNOWLEDGE);  MessageProducer producer = sess.createProducer(dest);  TextMessage textMessage = sess.createTextMessage(payload);  messageProducer.send(textMessage);   connection.close();  }! 57 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

58. JMS 2.0 Sending messages in Java EE @Resource(lookup = "jms/connFactory")  Need to create ConnectionFactory cf; ! intermediate objects @Resource(lookup="jms/inboundQueue")! just to satisfy the API Destination dest;! ! public void sendMessage (String payload) throws JMSException {! Connection conn = cf.createConnection();  Session sess = ! conn.createSession(false,Session.AUTO_ACKNOWLEDGE);  MessageProducer producer = sess.createProducer(dest);  TextMessage textMessage = sess.createTextMessage(payload);  messageProducer.send(textMessage);   connection.close();  }! 58 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

59. JMS 2.0 Sending messages in Java EE @Resource(lookup = "jms/connFactory")  ConnectionFactory cf; ! @Resource(lookup="jms/inboundQueue")! Redundant Destination dest;! arguments ! public void sendMessage (String payload) throws JMSException {! Connection conn = cf.createConnection();  Session sess = ! conn.createSession(false,Session.AUTO_ACKNOWLEDGE);  MessageProducer producer = sess.createProducer(dest);  TextMessage textMessage = sess.createTextMessage(payload);  messageProducer.send(textMessage);   connection.close();  }! 59 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

60. JMS 2.0 Sending messages in Java EE @Resource(lookup = "jms/connFactory")  ConnectionFactory cf; ! @Resource(lookup="jms/inboundQueue")! Destination dest;! Boilerplate code ! public void sendMessage (String payload) throws JMSException {! Connection conn = cf.createConnection();  Session sess = ! conn.createSession(false,Session.AUTO_ACKNOWLEDGE);  MessageProducer producer = sess.createProducer(dest);  TextMessage textMessage = sess.createTextMessage(payload);  messageProducer.send(textMessage);   connection.close();  }! 60 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

61. JMS 2.0 Sending messages in Java EE public void sendMessage (String payload) throws JMSException {! try {! Connection conn = null;! con = cf.createConnection();  Session sess = ! conn.createSession(false,Session.AUTO_ACKNOWLEDGE);  MessageProducer producer = sess.createProducer(dest);  TextMessage textMessage=sess.createTextMessage(payload);  messageProducer.send(textMessage); ! } finally {  connection.close();! }  }! Need to close connections after use 61 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

62. JMS 2.0 Sending messages in Java EE public void sendMessage (String payload) {! Connection conn = null;! try {! con = cf.createConnection();  Session sess = ! conn.createSession(false,Session.AUTO_ACKNOWLEDGE);  MessageProducer producer = sess.createProducer(dest);  TextMessage textMessage=sess.createTextMessage(payload);  messageProducer.send(textMessage); ! } catch (JMSException e1) {! // do something! } finally {! And there's try {  always exception if (conn!=null) connection.close();! handling to add } catch (JMSException e2){! // do something else! }! }  }! 62 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

63. JMS 1.1 – Sending a Message (Java EE) Standard API @Resource(lookup = "jms/connectionFactory ")  ConnectionFactory connectionFactory;     @Resource(lookup="jms/inboundQueue")   Queue inboundQueue;     public void sendMessageOld (String payload) throws JMSException {   try (Connection connection = connectionFactory.createConnection()) {   Session session = connection.createSession();   MessageProducer messageProducer = session.createProducer(inboundQueue);   TextMessage textMessage = session.createTextMessage(payload);  messageProducer.send(textMessage);   } ! } ! 63 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

64. JMS 2.0 – Sending a Message (Java EE) New Simplified API @Resource(mappedName="jms/contextFactory") ! ConnectionFactory connectionFactory;! ! @Resource(mappedName="jms/inboundQueue") ! Queue inboundQueue;! ! public void sendMessage(String payload) {! try (JMSContext context = connectionFactory.createContext();){! context.send(inboundQueue,payload);! }! }! 64 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

65. JMS 2.0 – Sending a Message (Java EE) New Simplified API (With Injection) @Inject! @JMSConnectionFactory("jms/contextFactory") ! JMSContext context;! ! @Resource(mappedName="jms/inboundQueue") ! Queue inboundQueue;! ! public void sendMessage(String payload) {! context.send(inboundQueue,payload);! }! 65 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

66. JMS 1.1 – Receiving a Message Synchronously Standard API @Resource(lookup = "jms/connectionFactory")  ConnectionFactory connectionFactory;!   @Resource(lookup="jms/inboundQueue")  Queue inboundQueue;     public String receiveMessageOld() throws JMSException {   try (Connection connection = connectionFactory.createConnection()) {   connection.start();   Session session = connection.createSession();   MessageConsumer messageConsumer = session.createConsumer(inboundQueue);   TextMessage textMessage = (TextMessage)messageConsumer.receive();  String payload = textMessage.getText();   return payload;   }   } ! 66 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

67. JMS 2.0 – Receiving a Message Synchronously New Simplified API @Resource(lookup = "jms/connectionFactory")   ConnectionFactory connectionFactory;     @Resource(lookup="jms/inboundQueue")   Queue inboundQueue;     public String receiveMessageNew() {   try (JMSContext context = connectionFactory.createContext()) {   JMSConsumer consumer = context.createConsumer(inboundQueue);   return consumer.receivePayload(String.class);   }   } ! 67 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

68. JMS 2.0 – Receiving a Message Synchronously New Simplified API (With Injection) @Inject   @JMSConnectionFactory("jms/connectionFactory")   private JMSContext context;     @Resource(lookup="jms/inboundQueue")   Queue inboundQueue;     public String receiveMessageNew() {   JMSConsumer consumer = context.createConsumer(inboundQueue);   return consumer.receivePayload(String.class);   } ! 68 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

69. JSON – Standard API •  Advantages –  Applications can use standard types –  Leaner, portable applications •  Two JSRs –  Processing/Parsing JSON (JSON-P) –  Binding JSON <-> Java objects (JSON-B) –  Similar to JAXP and JAXB –  Close collaboration between the two 69 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

70. JSON 1.0 (JSR 353) javax.json.* •  Object model API to represent JSON –  Similar to DOM API in XML world •  Streaming API to produce/consume JSON –  Similar to StAX API in XML world JSR Supporters –  fasterxml.com (Jackson) –  Doug Crockford (json.org) •  Spec: json-processing-spec.java.net •  Reference Implementation: jsonp.java.net 70 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

71. JSON 1.0 (JSR 353) •  DOM-based APIs (javax.json.* package) –  JSONBuilder – Builds a JSON object –  JSONReader – Reads a JSON object or array from the stream –  JSONWriter – Writes a JSON object or array to the stream •  Streaming APIs (javax.json.stream.* package) –  JsonGenerator – Streaming JSON generator –  JsonParser – Allows forward, read-only access to JSON 71 Copyright © 2012, Oracle and/or its affiliates. All rights reserved.

72. JSON 1.0 (JSR 353) Code Sample – JsonBuilder JsonObject value = new JsonBuilder()  { .beginObject()  "ﬁrstName": "John", .add("firstName", "John")   "lastName": "Smith", .add("lastName", "Smith")   "age": 25, add("age", 25)  "address" : { .beginObject("address”)  .add("streetAddress", "21 2nd Street”)  "streetAddress", "21 2nd Street", .add("city", "New York”) 

Java EE 7: Developing for the Cloud at Geecon, JEEConf, Johannesburg

Java EE 7: Developing for the Cloud at Geecon, JEEConf, Johannesburg

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Java EE 7: Developing for the Cloud at Geecon, JEEConf, Johannesburg