Java API for JSON Binding - Introduction and update
•
5 gostaram•3,087 visualizações
This document provides an introduction and update on the Java API for JSON Binding (JSON-B) specification (JSR 367). It discusses the goals of standardizing JSON binding in Java, the status of JSR 367, and an overview of the proposed JSON-B API including initialization, marshalling, unmarshalling, and mapping capabilities. The JSON-B API is intended to provide functionality similar to JAXB for binding Java objects to and from JSON.
Recomendados
Mais conteúdo relacionado
Mais procurados
Mais procurados (17)
Semelhante a Java API for JSON Binding - Introduction and update
Semelhante a Java API for JSON Binding - Introduction and update (20)
Último
Último (20)
Java API for JSON Binding - Introduction and update
- 3. Java API for JSON Binding Introduction and update Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Martin Grebac JSON-‐B Spec lead Development Manager TopLink & Metro Oracle Accept: application/json
- 4. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Program Agenda Introduction JSR; Status; Next Steps API Integration Q & A 1 2 3 4 5 4
- 5. Safe Harbor Statement 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. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 5
- 6. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Introduction 6
- 7. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. What is JSON Binding? • Converting Java objects to & from JSON 7
- 8. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. What is JSON Binding? • Converting Java objects to & from JSON 8 public class Employee { public int id; public String firstName; public String lastName; public String email; …. }
- 9. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. What is JSON Binding? • Converting Java objects to & from JSON 9 ! Employee e = new Employee(); e.id = 1111; e.firstName = “Martin”; e.lastName = “Grebac”; e.email = “martin.grebac@oracle.com”;
- 10. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. What is JSON Binding? • Converting Java objects to & from JSON 9 ! Employee e = new Employee(); e.id = 1111; e.firstName = “Martin”; e.lastName = “Grebac”; e.email = “martin.grebac@oracle.com”;
- 11. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. What is JSON Binding? • Converting Java objects to & from JSON 9 ! Employee e = new Employee(); e.id = 1111; e.firstName = “Martin”; e.lastName = “Grebac”; e.email = “martin.grebac@oracle.com”; { "id": 1111, "firstName" : "Martin", "lastName" : "Grebac", "email": "martin.grebac@oracle.com" }
- 12. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. What is JSON Binding? • Converting Java objects to & from JSON 10 JAX-‐RS Objects XML JSON JAXB JSON-‐B
- 13. Standardizing current technology Copyright © 2014, Oracle and/or its affiliates. All rights reserved. • Many mature or emerging JSON binding frameworks out there 11 ! • Jackson • Genson • Gson • EclipseLink MOXy • Fleece • JSON-‐lib • Flexjson • Json-‐io • JSONiJ • Xstream • …
- 14. Standardizing current technology Copyright © 2014, Oracle and/or its affiliates. All rights reserved. • Many mature or emerging JSON binding frameworks out there 11 ! • Jackson • Genson • Gson • EclipseLink MOXy • Fleece • JSON-‐lib • Flexjson • Json-‐io • JSONiJ • Xstream • …
- 15. Standardizing current technology Copyright © 2014, Oracle and/or its affiliates. All rights reserved. • Many mature or emerging JSON binding frameworks out there 11 ! • Jackson • Genson • Gson • EclipseLink MOXy • Fleece • JSON-‐lib • Flexjson • Json-‐io • JSONiJ • Xstream • …
- 16. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Standard API -‐ Advantages • Switch providers easily • Implementation compete on common ground (performance or feature-‐ wise) • Loss of implementation/participant is no issue for standard • More people able to help on forums or stackoverflow ;) even those not using your implementation of choice 12
- 17. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 13
- 18. JSR; Status; Next Steps Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 14
- 19. JSR 367 – Java API for JSON Binding (JSON-‐B) Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Status • JSR Proposal Submitted • https://www.jcp.org/en/jsr/detail?id=367 15
- 20. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 16 Proposal – In short • API with similar feel to JAXB ! • javax.json.bind ! • Spec project: http://jsonb-‐spec.java.net (stay tuned) ! • RI project: http://eclipselink.org ! • Standalone, looking for Java EE 8
- 21. JSR 367 – Java API for JSON Binding (JSON-‐B) Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Status • JSR Proposal Submitted • https://www.jcp.org/en/jsr/detail?id=367 • JSR Review period finished 08/Sep/2014 • JSR Review ballot finished 22/Sep/2014 17
- 22. JSR 367 – Java API for JSON Binding (JSON-‐B) Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Status • JSR Proposal Submitted • https://www.jcp.org/en/jsr/detail?id=367 • JSR Review period finished 08/Sep/2014 • JSR Review ballot finished 22/Sep/2014 17
- 23. JSR 367 – Java API for JSON Binding (JSON-‐B) Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Status • JSR Proposal Submitted • https://www.jcp.org/en/jsr/detail?id=367 • JSR Review period finished 08/Sep/2014 • JSR Review ballot finished 22/Sep/2014 ! • Accepting EG nominations: • https://www.jcp.org/en/jsr/egnom?id=367 18
- 24. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Next Steps JSR 367 – Java API for JSON Binding (JSON-‐B) 19 • Form Expert Group • Early Draft
- 25. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Next Steps JSR 367 – Java API for JSON Binding (JSON-‐B) 20 • Form Expert Group • Early Draft
- 26. API – Goals, Non-‐goals -‐ Proposal Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 21
- 27. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 22 Proposal – Goals • Binding JSON (RFC 7159) documents • Maintain consistency with JAXB API and other Java SE & EE APIs where applicable • Define default object-‐JSON mapping • Annotation based customizations for object-‐JSON mapping • Support binding using JSON-‐P APIs ! • Explore mapping subset of Json documents (Json Pointer) • Explore options to map 3rd party objects • Explore bi-‐directional mappings
- 28. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 23 Proposal – Non-‐goals • JSON Schema • Tooltime • Roundtrip • JEP 198 -‐ Lightweight JSON API
- 29. Runtime API -‐ Proposal Anything subject to change anytime Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 24
- 30. Proposal – Runtime Initialization – Default Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 25 import javax.json.bind.*; ! public void init() { ! JsonContext context = JsonContext.newInstance(); ! // JsonContext context = // JsonContext.newInstance(“com.provider.ProviderFactory"); ! Marshaller marshaller = context.createMarshaller(); ! Unmarshaller unmarshaller = context.createUnmarshaller; ! }
- 31. Proposal – Runtime Initialization – Context Builder Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 26 public void init() { ! JsonContext context = new JsonContextBuilder() .setScope (MyClass.class, …) .excludeField(“field”, MyClass.class) .addFilter(myContextFilterImplementation) .build(); }
- 32. Proposal – Runtime Initialization – Fluent Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 27 public void init() { ! JsonContext context = JsonContext.newInstance(); ! Marshaller marshaller = context.createMarshaller() .setProperty(Marshaller.PROPERTY) .setPrettyPrinting(true); ! Unmarshaller unmarshaller = context.createUnmarshaller() .setCloseStreams(true); ! }
- 33. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 28 Proposal – Marshalling (Writing) public void marshal() { !! Marshaller marshaller = jsonContext.createMarshaller(); ! //to String String string = marshaller.marshal(myObject); ! //to Writer marshaller.marshal(myObject, new FileWriter(“file.json”)); !! }
- 34. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 29 Proposal – Marshalling (Writing) public void marshal() { ! Marshaller marshaller = jsonContext.createMarshaller(); ! //to JSONP JsonGenerator FileWriter writer = new FileWriter(“file.json”); JsonGenerator generator = Json.createGenerator(writer); marshaller.marshal(myObject, generator); ! //expose as JSONP JsonParser JsonParser parser = marshaller.getJsonParser(myObject); ! //other JSONP constructs JsonObjectBuilder, … ! }
- 35. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 30 Proposal – Unmarshalling (Reading) public void unmarshal() { ! Unmarshaller unmarshaller = jsonContext.createUnmarshaller(); ! //from String String s = "{"field":"Value"}"; MyClass myInstance1 = (MyClass) unmarshaller.unmarshal(s); MyClass myInstance2 = unmarshaller.unmarshal(s, MyClass.class); ! //from Reader unmarshaller.unmarshal(new FileReader("file.json")); ! }
- 36. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 31 Proposal – Unmarshalling (Reading) public void unmarshal() { ! Unmarshaller unmarshaller = jsonContext.createUnmarshaller(); ! //from JSONP JsonParser File stream = new FileInputStream(“file.json”); JsonParser jsonParser = Json.createParser(stream); ! MyClass myInstance = unmarshaller.unmarshal(jsonParser); ! //other JSONP constructs … JsonStructure, JsonObject, JsonArray … ! }
- 37. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 32 Proposal – Unmarshalling (Reading) public void unmarshal() { ! Unmarshaller u = jsonContext.createUnmarshaller(); ! //expose JSONP JsonGenerator UnmarshallerJsonGenerator generator = u.getJsonGenerator(); generator.write(…); generator.write(…); … MyClass myInstance = (MyClass) generator.getResult(); ! }
- 38. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 33 Proposal – The Shortcut -‐ Jsonb ! String myString = Jsonb.marshal(myObject); ! MyObject object = Jsonb.unmarshal(someJsonString, MyObject.class); ! … !
- 39. Mapping API -‐ Proposal Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 34
- 40. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 35 Proposal – Default Mapping – Primitive types char _char; “_char" : "c", String _string; "_string" : “string”, ! byte _byte; "_byte" : 123, short _short; "_short" : 32767, int _int; "_int" : 2147483647, long _long; "_long" : 9223372036854775807, float _float; "_float" : 3.4028235E38, double _double; "_double" : 1.7976931348623157E308, ! boolean _boolean; "_boolean" : true, Boolean _Boolean; "_Boolean" : false, Byte _Byte; “_Byte" : 127, Short _Short; "_Short" : 32767, Integer _Integer; "_Integer" : 2147483647, Long _Long; "_Long" : 9223372036854775807, Float _Float; "_Float" : 3.4028235E38, Double _Double; "_Double" : 1.7976931348623157E308, ! //defaults -‐ Jackson: "NaN", Moxy: NaN //Genson throws exception … Float _NaNFloat = Float.NaN; ! //same as above Double _NaNDouble = Double.NaN; BigInteger _BigInteger; "_BigInteger" : 4611686014132, BigDecimal _BigDecimal; "_BigDecimal" : 850705917302332501249, ! String[] _stringArr; “_stringArr" : [ "abc", "def", "ghi" ], int[] _intArray; "_intArr" : [ 123, 456, 789 ], ! String[] _stringArrSingle; "_stringArrSingle" : [ "abc" ], int[] _intArrSingle; "_intArrSingle" : [ 123 ]
- 41. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 36 Proposal – Default Mapping – Dates • Date • Calendar • JDK 8 Date&Time API ! • Adapter / JsonDe/serializer, … • JsonFormat annotation • .useDateFormat(new SimpleDateFormat(…)) • .setDateFormat(new SimpleDateFormat(…))
- 42. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 37 Proposal – Default Mapping -‐ Dates -‐ JsonAdapter public class DateAdapter implements JsonAdapter<Date> { public String marshal(Date d) {…} public Date unmarshal(String s) {…} } ! public class Parent { @JsonJavaTypeAdapter(DateAdapter.class) public Date date; }
- 43. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 38 Proposal – Default Mapping -‐ Enum @JsonEnum public enum Options { @JsonEnumValue(“1”) OPTION_1, @JsonEnumValue(“2”) OPTION_2, @JsonEnumValue(“3”) OPTION_3; } { “option” : 1 } ! ! ! ! ! { “option” : 1 } option : OPTION_1
- 44. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 39 Proposal – Null value handling -‐ Default public String longDescription; ! { } ! ! ! ! ! ! ! { } longDescription : null (do not redefine)
- 45. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 40 Proposal – Null value handling -‐ JsonNillable @JsonNillable(true) public String longDescription; ! { “longDescription” : null } ! ! ! ! ! { “longDescription” : null } longDescription : null
- 46. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 41 Proposal – Customized Mapping -‐ Names @JsonProperty(“longdesc”); public String longDescription; ! { “longdesc” : “This is long description”, } ! ! ! ! ! { “longdesc” : “This is long description”, } longDescription : “This is long description”
- 47. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 42 Proposal – Customized Mapping -‐ Names private String longDescription; ! @JsonProperty(“long-‐desc”); public String getLongDescription() { return longDescription; } ! @JsonProperty(“longDesc”); public void setLongDescription(String ld) { this.longDescription = ld; } { “longDesc” : “This is long description”, } ! ! ! ! ! { “long-‐desc” : “This is long description”, } longDescription : “This is long description”
- 48. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 43 Proposal – Customized Mapping – Ignoring fields,properties @JsonTransient public String longDescription; { “longDesc” : “This is long description”, } ! ! ! ! ! ! { }
- 49. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 44 Proposal – Customized Mapping – Ignoring fields,properties @JsonTransient public String longDescription; ! ! ! ! ! ! ! ! ! { } longDescription : “This is not the long description from json document”
- 50. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 45 Proposal – Customized Mapping – Ignoring fields,properties private String longDescription; ! @JsonTransient public String getLongDescription() { return longDescription; } ! public void setLongDescription(String ld) { this.longDescription = ld; } { “longDesc” : “This is long description”, } ! ! ! ! ! { } longDescription : “This is long description”
- 51. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 46 Proposal – Customized Mapping – Ignoring fields,properties private String longDescription; ! public String getLongDescription() { return longDescription; } ! @JsonTransient public void setLongDescription(String ld) { this.longDescription = ld; } { “longDesc” : “This is long description” } ! ! ! ! ! { “longDesc” : “Different description” } longDescription : “Different description”
- 52. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 47 Proposal – Customized Mapping – Ordering @JsonPropertyOrder(“title”, “author”) public class Employee { public String author; public String title; } ! ! ! ! ! ! ! { “title” : “Effective Java”, “author” : “Joshua Bloch” } Book: : author : title
- 53. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 48 Proposal – Customized Mapping – Access @JsonAccessorType(JsonAccessType.FIELD) public class Employee { private String author; private String title; } ! NONE FIELD PUBLIC PROTECTED_PUBLIC ANY … ?
- 54. Book: : title : author : longDescription : summary Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 49 Proposal – Simple value mapping public class Description { private String longDescription; ! @JsonValue public String getLongDescription() { return longDescription; } ! public void setLongDescription(String ld) { this.longDescription = ld; } } ! ! ! ! ! ! ! ! { “title” : “Title”, “author” : “Author Name”, “description” Description: : longDescription = “This is long description” : “This is long description”, “summary” : “Summary”, }
- 55. Need joke to cool down … Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 50
- 56. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. @mgrebac 51
- 57. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. http://www.tehnrd.com/ 52
- 58. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. http://www.tehnrd.com/ 53 • Hear someone talking about how cool, efficient, and great to work with Jason is …
- 59. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. http://www.tehnrd.com/ 54 • Hear someone talking about how cool, efficient, and great to work with Jason is … ! • … and then realizing they are talking about JSON!
- 60. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 55 Proposal -‐ Inheritance, Polymorphism @JsonDiscriminatorProperty(“type”) public abstract class ContactInfo {} !! public class Address extends ContactInfo { public String street; } !! public class Email extends ContactInfo { public String email; } !! public class Phone extends ContactInfo { public String phoneNumber; } !
- 61. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 56 Proposal -‐ Inheritance, Polymorphism @JsonDiscriminatorProperty(“type”) public abstract class ContactInfo {} ! @JsonDiscriminatorValue(“address-‐type”) public class Address extends ContactInfo { public String street; } ! @JsonDiscriminatorValue(“email-‐type”) public class Email extends ContactInfo { public String email; } ! @JsonDiscriminatorValue(“phone-‐type”) public class Phone extends ContactInfo { public String phoneNumber; } !
- 62. Address Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 56 Proposal -‐ Inheritance, Polymorphism @JsonDiscriminatorProperty(“type”) public abstract class ContactInfo {} ! @JsonDiscriminatorValue(“address-‐type”) public class Address extends ContactInfo { public String street; } ! @JsonDiscriminatorValue(“email-‐type”) public class Email extends ContactInfo { public String email; } ! @JsonDiscriminatorValue(“phone-‐type”) public class Phone extends ContactInfo { public String phoneNumber; } ! ! { “type” : “address-‐type”, “street” : “1099 Lombard Street” } ! ! Email ! ! { “type” : “email-‐type”, “email” : “larry.ellison@oracle.com” }
- 63. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 57 Proposal – Inheritance, Polymorphism supporting @JsonSeeAlso( {Address.class, Phone.class, Email.class} ) @JsonDiscriminatorProperty(“type”) public abstract class ContactInfo {}
- 64. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 58 Proposal – Instantiation – Factories, Constructors public class CreatedClass { @JsonCreator public static CreatedClass create() { return new CreatedClass(); } } ! public class ConstrClass { public ConstrClass( @JsonProperty(“name”) name, @JsonProperty(“email”) email) { … } } { “created” : { }, “constructed” : { “email” : “larry.ellison@oracle.com”, “name” : “Larry Ellison” } } ParentClass { // by CreatedClass.create() CreatedClass created; ! /* by new ConstrClass( “larry.ellison@oracle.com”, “Larry Ellison” ) */ ConstructedClass constructed; }
- 65. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 59 Proposal – Lifecycle events @JsonPreUnmarshal @JsonPostUnmarshal ! @JsonPreMarshal @JsonPostMarshal
- 66. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 60 Explore mapping 3rd party objects • Mix-‐in annotations (Jackson) • External metadata format (MOXy) • …
- 67. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 61 Explore binding JSON document subset -‐ JSONPointer ? { "title": "Recent Uploads tagged javaone", "link": "http://www.flickr.com/photos/tags/javaone/", "description": "", "modified": "2014-‐03-‐22T16:40:19Z", "generator": "http://www.flickr.com/", "items": [ { "title": "IMG_1377", "link": "http://www.flickr.com/photos/soniaauv/13332491484/", "media": {"m":"http://farm4.staticflickr.com/3788/13332491484_a96c2599e8_m.jpg"}, "date_taken": "2007-‐05-‐07T12:33:19-‐08:00", "description": " <p>…</p> ", "published": "2014-‐03-‐22T16:40:19Z", "author": "nobody@flickr.com (S.O.N.I.A. ETS)", "author_id": "117446064@N05", "tags": "javaone preparations 2007 vision:outdoor=0983 vision:plant=0872" }, { "title": "IMG_1388", "link": "http://www.flickr.com/photos/soniaauv/13332247843/", "media": {"m":"http://farm3.staticflickr.com/2824/13332247843_f5805b59fd_m.jpg"}, "date_taken": "2007-‐05-‐07T21:45:56-‐08:00", "description": " <p>…</p> ", "published": "2014-‐03-‐22T16:40:26Z", "author": "nobody@flickr.com (S.O.N.I.A. ETS)", "author_id": "117446064@N05", "tags": "javaone preparations 2007 vision:mountain=0853 vision:sky=0722" }, … { public class FlickrExtract { ! @JsonPointer(“/link”) public String linkUrl; @JsonPointer(“/items/0/title”) public String firstPictureTitle; ! }
- 68. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 62 Explore binding JSON document subset -‐ JSONPointer ? { "title": "Recent Uploads tagged javaone", "link": "http://www.flickr.com/photos/tags/javaone/", "description": "", "modified": "2014-‐03-‐22T16:40:19Z", "generator": "http://www.flickr.com/", "items": [ { "title": "IMG_1377", "link": "http://www.flickr.com/photos/soniaauv/13332491484/", "media": {"m":"http://farm4.staticflickr.com/3788/13332491484_a96c2599e8_m.jpg"}, "date_taken": "2007-‐05-‐07T12:33:19-‐08:00", "description": " <p>…</p> ", "published": "2014-‐03-‐22T16:40:19Z", "author": "nobody@flickr.com (S.O.N.I.A. ETS)", "author_id": "117446064@N05", "tags": "javaone preparations 2007 vision:outdoor=0983 vision:plant=0872" }, { "title": "IMG_1388", "link": "http://www.flickr.com/photos/soniaauv/13332247843/", "media": {"m":"http://farm3.staticflickr.com/2824/13332247843_f5805b59fd_m.jpg"}, "date_taken": "2007-‐05-‐07T21:45:56-‐08:00", "description": " <p>…</p> ", "published": "2014-‐03-‐22T16:40:26Z", "author": "nobody@flickr.com (S.O.N.I.A. ETS)", "author_id": "117446064@N05", "tags": "javaone preparations 2007 vision:mountain=0853 vision:sky=0722" }, … { public class FlickrExtract { ! @JsonPointer(“/items/0/media”) public Media media; ! } ! public class Media { public String m; }
- 69. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 63 Explore binding JSON document subset -‐ JSONPath ? { "title": "Recent Uploads tagged javaone", "link": "http://www.flickr.com/photos/tags/javaone/", "description": "", "modified": "2014-‐03-‐22T16:40:19Z", "generator": "http://www.flickr.com/", "items": [ { "title": "IMG_1377", "link": "http://www.flickr.com/photos/soniaauv/13332491484/", "media": {"m":"http://farm4.staticflickr.com/3788/13332491484_a96c2599e8_m.jpg"}, "date_taken": "2007-‐05-‐07T12:33:19-‐08:00", "description": " <p>…</p> ", "published": "2014-‐03-‐22T16:40:19Z", "author": "nobody@flickr.com (S.O.N.I.A. ETS)", "author_id": "117446064@N05", "tags": "javaone preparations 2007 vision:outdoor=0983 vision:plant=0872" }, { "title": "IMG_1388", "link": "http://www.flickr.com/photos/soniaauv/13332247843/", "media": {"m":"http://farm3.staticflickr.com/2824/13332247843_f5805b59fd_m.jpg"}, "date_taken": "2007-‐05-‐07T21:45:56-‐08:00", "description": " <p>…</p> ", "published": "2014-‐03-‐22T16:40:26Z", "author": "nobody@flickr.com (S.O.N.I.A. ETS)", "author_id": "117446064@N05", "tags": "javaone preparations 2007 vision:mountain=0853 vision:sky=0722" }, … { public class FlickrExtract { ! @JsonPath(“$.link”) public String linkUrl; @JsonPath(“$.items.*.title”) public String[] pictureTitles; ! }
- 70. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Integration 64
- 71. Affected, used, under consideration specifications Copyright © 2014, Oracle and/or its affiliates. All rights reserved. • JSR 353 – Java API for JSON Processing (JSON-‐P) • JSR 339 – Java API for RESTful services (JAX-‐RS) • JSR 349 – Bean Validation (BV) • JSR ??? – JEP 198 – Light-‐Weight JSON API 65
- 72. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. JAX-‐RS • JAX-‐RS allowed to standardize on JSON-‐Binding • Custom JSON-‐Binding 66
- 73. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. JSON-‐P • Already covered 67
- 74. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. JPA Back-‐reference (Inverse reference) support • Explore mapping bidirectional references 68 public class A { @JsonManagedReference public B getB(); } ! public class B { @JsonBackReference public A getA(); } public class A { public B getB(); } ! ! public class B { @XmlInverseReference(mappedBy=“b”) public A getA(); }
- 75. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Call to ACTION! • Participate as an observer • users@jsonb-‐spec.java.net • Join EG • https://jcp.org/en/jsr/detail?id=367 69
- 76. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Q & A • Participate as an observer • users@jsonb-‐spec.java.net • Join EG • https://jcp.org/en/jsr/detail?id=367 70
- 77. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Related Talk(s) • CON5742 -‐ JSON Pointer and JSON Patch: Updates to the Java API for JSON Processing • Kin-‐Man Chung • Tuesday, September 30, 4-‐5pm, Cyril Magnin II/III 71
- 78. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. Sources, References • https://jcp.org/en/jsr/detail?id=367 • http://www.developer.com/lang/jscript/top-‐7-‐open-‐source-‐json-‐binding-‐ providers-‐available-‐today.html • http://goessner.net/articles/JsonPath/ • http://eclipselink.org 72
- 79. My JSON joke fell flat because I got the quotes wrong. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. – Jeff Waugh’s tweet 73
- 80. Safe Harbor Statement The preceding 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. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 74
- 81. Copyright © 2014, Oracle and/or its affiliates. All rights reserved. 75