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Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JSON support in Java EE 8
Dmitry Kornilov
JSONB/P Spe...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
Safe Harbor Statement
The following is intended to ou...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 3
Werner Keil
• Consultant – Coach
• Creative Cosmopo...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 4
Dmitry Kornilov
• Software Developer @ Oracle
• Har...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
Program Agenda
Introduction
JSON Processing
JSON Bind...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
Introduction
6
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 7
What is JSON???
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
This is Jason
8
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
This is also Jason
9
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
This is JSON-B
10
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
What is JSON?
• JavaScript Object Notation
• Subset o...
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JSON Support in Java EE 8
• JSON Processing API
– Sta...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JSON Processing
13
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JSON-P
• Streaming API
– JsonParser
– JsonGenerator
•...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JsonParser
• JsonParser
– Parses JSON in a streaming ...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 16
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 17
JsonParser
START_OBJECT{
"name":
"Jason Bourne",
"...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 18
JsonParser
START_OBJECT
KEY_NAME
{
"name":
"Jason ...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 19
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
{
"n...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 20
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
KEY_...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 21
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
KEY_...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 22
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
KEY_...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 23
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
KEY_...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 24
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
KEY_...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 25
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
KEY_...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 26
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
KEY_...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 27
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
KEY_...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 28
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
KEY_...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 29
JsonParser
START_OBJECT
KEY_NAME
VALUE_STRING
KEY_...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 30
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 31
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 32
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 33
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 34
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 35
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 36
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 37
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 38
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 39
JsonParser
{
"name":
"Jason Bourne",
"age":
35,
"p...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JsonGenerator
• Generates JSON in a streaming way to ...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 41
JsonGenerator
JsonGenerator ge=Json.createGenerato...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
Object Model API
• Builder to build JsonObject and Js...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 43
Object Model API
JsonArray value = Json.createArra...
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JSON-P 1.1
• Update JSON-P spec to stay current with ...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JsonPointer
• IETF RFC 6901
• String syntax for ident...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JSON Pointer Sample
JsonArray jasons = . . .;
JsonPoi...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JsonPatch
• IETF RFC 6902
• Modify Parts of JSON docu...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 48
JSON Patch Sample
[
{ "op": "replace",
"path": "/1...
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JSON Patch Sample
[
{ "op": "replace",
"path": "/1...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 50
JSON Patch Sample
[
{ "op": "replace",
"path": "/1...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JSON-P Web Sites
• Specification
– https://json-proce...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JSON Binding
52
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JSON Binding
• API to serialize/deserialize Java obje...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
• No configuration, no annotations
• The scope:
– Bas...
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JSON-B Engine
public interface Jsonb extends AutoC...
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JSON-B Sample
56
Person person1 = new Person();
perso...
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Basic Types
– java.lang.String
– java.lang.Character
...
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Date/Time
58
java.util.Date ISO_DATE_TIME
java.util.C...
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Date/Time Samples
59
// java.util.Date
SimpleDateForm...
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Arrays/Collections
• Collection
• Map
• Set
• HashSet...
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• javax.json.JsonArray
• javax.json.JsonStructure
• j...
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Classes
• Public and protected nested and static nest...
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Fields
• Final fields are serialized
• Static fields ...
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public class Parent {
public int parentB;
public int ...
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public class Parent {
public int parentB;
public int ...
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Serialization
• Existing fields with public getters
•...
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public class Foo {
public final int publicFinalField;...
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• Annotations
• Runtime configuration
– JsonbConfig
–...
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Customizations
• Property names
• Property order
•...
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• Annotation
– @JsonbProperty
• Scope:
– Field
– Gett...
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Property Naming Strategy
• Supported naming strategie...
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• Strategies:
– LEXICOGRAPHICAL (A-Z)
– ANY
– REVERSE...
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• Annotation
– @JsonbTransient
73
Ignoring Properties...
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• PropertyVisibilityStrategy
interface
• Annotation
–...
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• Null fields are skipped by default
• Annotation
– @...
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public class Customer {
public int id;
public String ...
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• Annotations
– @JsonbDateFormat
– @JsonbNumberFormat...
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• Supported encodings
– BYTE (default)
– BASE_64
– BA...
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I-JSON
• I-JSON (”Internet JSON”) is a restricted pro...
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• Inspired by JAXB
• Annotations
– @JsonbTypeAdapter ...
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• Low level control on
serialization/deserialization
...
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JSON-B Demo
• GitHub
– https://github.com/m0mus/JavaO...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
JSON-B Web Sites
• JSON-B web site
– http://json-b.ne...
Copyright © 2016, Oracle and/or its affiliates. All rights reserved.
Q & A
84
JSON Support in Java EE 8
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JSON Support in Java EE 8

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Slides from my and Werner Keil presentation on Java2Days 2016 conference in Sofia.

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JSON Support in Java EE 8

  1. 1. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON support in Java EE 8 Dmitry Kornilov JSONB/P Specification Lead @m0mus Werner Keil JSON-P EG Member @wernerkeil November 15, 2016
  2. 2. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 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. 2
  3. 3. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 3 Werner Keil • Consultant – Coach • Creative Cosmopolitan • Open Source Evangelist • Software Architect • Spec Lead – JSR363 • Individual JCP Executive Committee Member
  4. 4. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 4 Dmitry Kornilov • Software Developer @ Oracle • Hardcore Gamer • JSON-B (JSR-367) spec lead • JSON-P (JSR-374) spec lead • Outstanding Spec Lead 2016 • EclipseLink project committer
  5. 5. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Program Agenda Introduction JSON Processing JSON Binding Q & A 1 2 3 5 5
  6. 6. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Introduction 6
  7. 7. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 7 What is JSON???
  8. 8. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. This is Jason 8
  9. 9. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. This is also Jason 9
  10. 10. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. This is JSON-B 10
  11. 11. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. What is JSON? • JavaScript Object Notation • Subset of JavaScript • Lightweight data-interchange format • Object, Array, Value 11 { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  12. 12. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON Support in Java EE 8 • JSON Processing API – Standard API to parse, generate, transform, query JSON – Object Model and Streaming API • similar to DOM and StAX • JSON Binding API – Binding JSON documents to Java objects • similar to JAXB 12
  13. 13. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON Processing 13
  14. 14. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON-P • Streaming API – JsonParser – JsonGenerator • Object model API – JsonReader – JsonWriter – JsonPointer – JsonPatch – JsonMergePatch 14
  15. 15. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JsonParser • JsonParser – Parses JSON in a streaming way from input sources – Similar to StAX’s XMLStreamReader, a pull parser • Created using: • Json.createParser(…), Json.createParserFactory().createParser(…) • Optionally, configured with features • Parser state events: – START_ARRAY, START_OBJECT, KEY_NAME, VALUE_STRING, VALUE_NUMBER, VALUE_TRUE, VALUE_FALSE, VALUE_NULL, END_OBJECT, END_ARRAY 15
  16. 16. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 16 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  17. 17. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 17 JsonParser START_OBJECT{ "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  18. 18. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 18 JsonParser START_OBJECT KEY_NAME { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  19. 19. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 19 JsonParser START_OBJECT KEY_NAME VALUE_STRING { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  20. 20. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 20 JsonParser START_OBJECT KEY_NAME VALUE_STRING KEY_NAME { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  21. 21. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 21 JsonParser START_OBJECT KEY_NAME VALUE_STRING KEY_NAME VALUE_NUMBER { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  22. 22. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 22 JsonParser START_OBJECT KEY_NAME VALUE_STRING KEY_NAME VALUE_NUMBER KEY_NAME { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  23. 23. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 23 JsonParser START_OBJECT KEY_NAME VALUE_STRING KEY_NAME VALUE_NUMBER KEY_NAME START_ARRAY { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  24. 24. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 24 JsonParser START_OBJECT KEY_NAME VALUE_STRING KEY_NAME VALUE_NUMBER KEY_NAME START_ARRAY START_OBJECT { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  25. 25. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 25 JsonParser START_OBJECT KEY_NAME VALUE_STRING KEY_NAME VALUE_NUMBER KEY_NAME START_ARRAY START_OBJECT KEY_NAME, KEY_STRING { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  26. 26. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 26 JsonParser START_OBJECT KEY_NAME VALUE_STRING KEY_NAME VALUE_NUMBER KEY_NAME START_ARRAY START_OBJECT KEY_NAME, KEY_STRING KEY_NAME, KEY_STRING { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  27. 27. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 27 JsonParser START_OBJECT KEY_NAME VALUE_STRING KEY_NAME VALUE_NUMBER KEY_NAME START_ARRAY START_OBJECT KEY_NAME, KEY_STRING KEY_NAME, KEY_STRING END_OBJECT { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  28. 28. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 28 JsonParser START_OBJECT KEY_NAME VALUE_STRING KEY_NAME VALUE_NUMBER KEY_NAME START_ARRAY START_OBJECT KEY_NAME, KEY_STRING KEY_NAME, KEY_STRING END_OBJECT END_ARRAY { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  29. 29. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 29 JsonParser START_OBJECT KEY_NAME VALUE_STRING KEY_NAME VALUE_NUMBER KEY_NAME START_ARRAY START_OBJECT KEY_NAME, KEY_STRING KEY_NAME, KEY_STRING END_OBJECT END_ARRAY END_OBJECT { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] }
  30. 30. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 30 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] } JsonParser parser = Json.createParser(...);
  31. 31. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 31 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] } JsonParser parser = Json.createParser(...); Event e = parser.next(); // START_OBJECT
  32. 32. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 32 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] } JsonParser parser = Json.createParser(...); Event e = parser.next(); // START_OBJECT parser.next(); // KEY_NAME
  33. 33. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 33 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] } JsonParser parser = Json.createParser(...); Event e = parser.next(); // START_OBJECT parser.next(); // KEY_NAME parser.getString(); // name
  34. 34. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 34 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] } JsonParser parser = Json.createParser(...); Event e = parser.next(); // START_OBJECT parser.next(); // KEY_NAME parser.getString(); // name parser.next(); // VALUE_STRING
  35. 35. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 35 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] } JsonParser parser = Json.createParser(...); Event e = parser.next(); // START_OBJECT parser.next(); // KEY_NAME parser.getString(); // name parser.next(); // VALUE_STRING parser.getString(); // Jason Bourne
  36. 36. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 36 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] } JsonParser parser = Json.createParser(...); Event e = parser.next(); // START_OBJECT parser.next(); // KEY_NAME parser.getString(); // name parser.next(); // VALUE_STRING parser.getString(); // Jason Bourne parser.next(); // KEY_NAME
  37. 37. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 37 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] } JsonParser parser = Json.createParser(...); Event e = parser.next(); // START_OBJECT parser.next(); // KEY_NAME parser.getString(); // name parser.next(); // VALUE_STRING parser.getString(); // Jason Bourne parser.next(); // KEY_NAME parser.getString(); // age
  38. 38. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 38 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] } JsonParser parser = Json.createParser(...); Event e = parser.next(); // START_OBJECT parser.next(); // KEY_NAME parser.getString(); // name parser.next(); // VALUE_STRING parser.getString(); // Jason Bourne parser.next(); // KEY_NAME parser.getString(); // age parser.next(); // VALUE_NUMBER
  39. 39. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 39 JsonParser { "name": "Jason Bourne", "age": 35, "phoneNumbers": [ { "type": "home", "number": "123-456-789" } ] } JsonParser parser = Json.createParser(...); Event e = parser.next(); // START_OBJECT parser.next(); // KEY_NAME parser.getString(); // name parser.next(); // VALUE_STRING parser.getString(); // Jason Bourne parser.next(); // KEY_NAME parser.getString(); // age parser.next(); // VALUE_NUMBER parser.getInt(); // 35
  40. 40. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JsonGenerator • Generates JSON in a streaming way to output sources – Similar to StAX’s XMLStreamWriter • Created using: – Json.createGenerator(…) – Json.createGeneratorFactory().createGenerator(…) • Optionally, configured with features – e.g. pretty printing • Allows method chaining 40
  41. 41. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 41 JsonGenerator JsonGenerator ge=Json.createGenerator(…); ge.writeStartArray() .writeStartObject() .write("type", "home”) .write("number", "123-456-789") .writeEnd() .writeStartObject() .write("type", "fax”) .write("number", "123-456-790") .writeEnd() .writeEnd() .close(); [ { "type": "home”, "number": "123-456-789" }, { "type": "fax”, "number": "123-456-790" } ]
  42. 42. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Object Model API • Builder to build JsonObject and JsonArray from scratch • Allows method chaining • Type-safe (cannot mix array and object building methods) • Can also use existing JsonObject and JsonArray in a builder 42
  43. 43. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 43 Object Model API JsonArray value = Json.createArrayBuilder() .add(Json.createObjectBuilder() .add("type", "home") .add("number", "123-456-789") ) .add(Json.createObjectBuilder() .add("type", "fax") .add("number", "123-456-790") ) .build(); [ { "type": "home”, "number": "123-456-789" }, { "type": "fax”, "number": "123-456-790" } ]
  44. 44. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON-P 1.1 • Update JSON-P spec to stay current with emerging standards (RFC 7159) • Support for IETF standards on – JSON Pointer (RFC 6901) – JSON Patch (RFC 6902) – JSON Merge Patch (RFC 7396) • Add editing/transformation operations to JSON objects and arrays • Support for a streaming API, together with Collectors • Support for processing big JSON, e.g. add filters to JSON parsing. 44
  45. 45. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JsonPointer • IETF RFC 6901 • String syntax for identifying a specific value – /phone/mobile – /parents/0 • Special characters – "/" —> "~1" – "~" —> "~0" 45
  46. 46. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON Pointer Sample JsonArray jasons = . . .; JsonPointer pointer = Json.createPointer("/1/profession"); JsonValue profession = pointer.getValue(jasons); p.replace(jasons, Json.createValue("Super agent")); 46 [ { "name": "Jason Voorhees", "profession": "Maniac killer", "age": 45 }, { "name": "Jason Bourne", "profession": "Maniac killer", "age": 35 } ]
  47. 47. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JsonPatch • IETF RFC 6902 • Modify Parts of JSON document • Patch is a JSON document itself • Operations: – Add, replace, remove, move, copy, test • HTTP PATCH method (application/json-patch+json) 47
  48. 48. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 48 JSON Patch Sample [ { "op": "replace", "path": "/1/profession", "value": "Super agent" }, { "op": "remove", "path": "/2" } ] [ { "name": "Jason Voorhees", "profession": "Maniac killer", "age": 45 }, { "name": "Jason Bourne", "profession": "Maniac killer", "age": 35 }, { "name": "James Bond", "profession": "Agent 007", "age": 40 } ]
  49. 49. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 49 JSON Patch Sample [ { "op": "replace", "path": "/1/profession", "value": "Super agent" }, { "op": "remove", "path": "/2" } ] [ { "name": "Jason Voorhees", "profession": "Maniac killer", "age": 45 }, { "name": "Jason Bourne", "profession": "Super agent", "age": 35 }, { "name": "James Bond", "profession": "Agent 007", "age": 40 } ]
  50. 50. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 50 JSON Patch Sample [ { "op": "replace", "path": "/1/profession", "value": "Super agent" }, { "op": "remove", "path": "/2" } ] [ { "name": "Jason Voorhees", "profession": "Maniac killer", "age": 45 }, { "name": "Jason Bourne", "profession": "Super agent", "age": 35 } ]
  51. 51. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON-P Web Sites • Specification – https://json-processing-spec.java.net • RI: – https://jsonp.java.net • GitHub – https://github.com/json-p • JCP – https://jcp.org/en/jsr/detail?id=374 51
  52. 52. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON Binding 52
  53. 53. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON Binding • API to serialize/deserialize Java objects to/from JSON documents – Similar to JAX-B – Standardizes the current technologies (Jackson, Genson, Gson) • Default mapping between classes and JSON • Customization APIs – Annotations (@JsonbProperty, @JsonbNillable) – Runtime configuration builder • Natural follow on to JSON-P – Closes the JSON support gap – Allows to change providers 53
  54. 54. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • No configuration, no annotations • The scope: – Basic Types – Specific JDK Types – Dates – Classes – Collections/Arrays – Enumerations – JSON-P 54 Default Mapping import javax.json.bind.Jsonb; import javax.json.bind.JsonbBuilder; // Create with default config Jsonb jsonb = JsonbBuilder.create();
  55. 55. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 55 JSON-B Engine public interface Jsonb extends AutoCloseable { <T> T fromJson(String str, Class<T> type); <T> T fromJson(String str, Type runtimeType); <T> T fromJson(Reader reader, Class<T> type); <T> T fromJson(Reader reader, Type runtimeType); <T> T fromJson(InputStream stream, Class<T> type); <T> T fromJson(InputStream stream, Type runtimeType); String toJson(Object object); String toJson(Object object, Type runtimeType); void toJson(Object object, Writer writer); void toJson(Object object, Type runtimeType, Writer writer); void toJson(Object object, OutputStream stream); void toJson(Object object, Type runtimeType, OutputStream stream); }
  56. 56. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON-B Sample 56 Person person1 = new Person(); person1.setName("Jason Voorhees"); person1.setProfession("Maniac killer"); person1.setAge(45); Person person2 = new Person(); person2.setName("Jason Bourne"); person2.setProfession("Super agent"); person2.setAge(35); List<Person> persons = new ArrayList<>(); persons.add(person1); persons.add(person2); Jsonb jsonb = JsonbBuilder.create(); jsonb.toJson(persons); [ { "name": "Jason Voorhees", "profession": "Maniac killer", "age": 45 }, { "name": "Jason Bourne", "profession": "Super agent", "age": 35 } ]
  57. 57. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Basic Types – java.lang.String – java.lang.Character – java.lang.Byte (byte) – java.lang.Short (short) – java.lang.Integer (int) – java.lang.Long (long) – java.lang.Float (float) – java.lang.Double (double) – java.lang.Boolean (boolean) Specific Types – java.math.BigInteger – java.math.BigDecimal – java.net.URL – java.net.URI – java.util.Optional – java.util.OptionalInt – java.util.OptionalLong – java.util.OptionalDouble 57 Basic and Specific Types
  58. 58. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Date/Time 58 java.util.Date ISO_DATE_TIME java.util.Calendar, java.util.GregorianCalendar ISO_DATE if to time information present, otherwise ISO_DATE_TIME Java.util.TimeZone, java.util.SimpleTimeZone NormalizedCustomId (see TimeZone javadoc) java.time.Instant ISO_INSTANT java.time.LocalDate ISO_LOCAL_DATE java.time.LocalTime ISO_LOCAL_TIME java.time.LocalDateTime ISO_LOCAL_DATE_TIME java.time.ZonedDateTime ISO_ZONED_DATE_TIME java.time.OffsetDateTime ISO_OFFSET_DATE_TIME java.time.OffsetTime ISO_OFFSET_TIME java.time.ZoneId NormalizedZoneId as specified in ZoneId javadoc java.time.ZoneOffset NormalizedZoneId as specified in ZoneOffset javadoc java.time.Duration ISO 8601 seconds based representation java.time.Period ISO 8601 period representation
  59. 59. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Date/Time Samples 59 // java.util.Date SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy"); Date parsedDate = sdf.parse("15.11.2016"); jsonb.toJson(parsedDate)); // ”2016-11-15T00:00:00" // java.util.Calendar Calendar dateCalendar = Calendar.getInstance(); dateCalendar.clear(); dateCalendar.set(2016, 11, 15); jsonb.toJson(dateCalendar); // ”2016-11-15” // java.time.Instant jsonb.toJson(Instant.parse("2016-11-15T23:00:00Z")); // ”2016-11-15T23:00:00Z” // java.time.Duration jsonb.toJson(Duration.ofHours(5).plusMinutes(4)); // “PT5H4M" // java.time.Period jsonb.toJson(Period.between( LocalDate.of(1960, Month.JANUARY, 1), LocalDate.of(1970, Month.JANUARY, 1))); // "P10Y"
  60. 60. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Arrays/Collections • Collection • Map • Set • HashSet • NavigableSet • SortedSet • TreeSet • LinkedHashSet • TreeHashSet • HashMap • NavigableMap • SortedMap • TreeMap • LinkedHashMap • TreeHashMap • List • ArrayList • LinkedList • Deque • ArrayDeque • Queue • PriorityQueue • EnumSet • EnumMap 60
  61. 61. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • javax.json.JsonArray • javax.json.JsonStructure • javax.json.JsonValue • javax.json.JsonPointer • javax.json.JsonString • javax.json.JsonNumber • javax.json.JsonObject 61 JSON-P Types // JsonObject JsonBuilderFactory f = Json.createBuilderFactory(null); JsonObject jsonObject = f.createObjectBuilder() .add(“name", "Jason Bourne") .add(“city", "Prague") .build(); jsonb.toJson(jsonObject);
  62. 62. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Classes • Public and protected nested and static nested classes • Anonymous classes (serialization only) • Inheritance is supported • Default no-argument constructor is required for deserialization 62
  63. 63. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Fields • Final fields are serialized • Static fields are skipped • Transient fields are skipped • Null fields are skipped • Fields order – Lexicographical order – Parent class fields are serialized before child class fields 63
  64. 64. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. public class Parent { public int parentB; public int parentA; } { "parentA": 1, "parentB": 2 } 64 Fields Order Sample
  65. 65. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. public class Parent { public int parentB; public int parentA; } public class Child extends Parent { public int childB; public int childA; } { "parentA": 1, "parentB": 2 } { "parentA": 1, "parentB": 2, "childA": 3, "childB": 4 } 65 Fields Order Sample
  66. 66. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Serialization • Existing fields with public getters • Public fields with no getters • Public getter/setter pair without a corresponding field • Deserialization • Existing fields with public setters • Public fields with no setters • Public getter/setter pair without a corresponding field 66 Scope and Field Access Strategy
  67. 67. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. public class Foo { public final int publicFinalField; private final int privateFinalField; public static int publicStaticField; public int publicWithNoGetter; public int publicWithPrivateGetter; public Integer publicNullField = null; private int privateWithNoGetter; private int privateWithPublicGetter; public int getNoField() {}; public void setNoField(int value) {}; } { "publicFinalField": 1, "publicWithNoGetter": 1, "privateWithPublicGetter": 1, "noField": 1 } 67 Scope and Field Access Strategy
  68. 68. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • Annotations • Runtime configuration – JsonbConfig – JsonbBuilder 68 JSON-B Engine Configuration JsonbConfig config = new JsonbConfig() .withFormatting(…) .withNullValues(…) .withEncoding(…) .withStrictIJSON(…) .withPropertyNamingStrategy(…) .withPropertyOrderStrategy(…) .withPropertyVisibilityStrategy(…) .withAdapters(…) .withBinaryDataStrategy(…); Jsonb jsonb = JsonbBuilder.newBuilder() .withConfig(…) .withProvider(…) .build();
  69. 69. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. 69 Customizations • Property names • Property order • Ignoring properties • Null handling • Custom instantiation • Fields visibility • Date/Number Formats • Binary Encoding • Adapters • Serializers/Deserializers
  70. 70. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • Annotation – @JsonbProperty • Scope: – Field – Getter/Setter – Parameter 70 Property Names public class Customer { private int id; @JsonbProperty("name") private String firstName; } public class Customer { public int id; public String firstName; @JsonbProperty("name") public String getFirstName() { return firstName; } }
  71. 71. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Property Naming Strategy • Supported naming strategies – IDENTITY (myMixedCaseProperty) – LOWER_CASE_WITH_DASHES (my-mixed-case-property) – LOWER_CASE_WITH_UNDERSCORES (my_mixed_case_property) – UPPER_CAMEL_CASE (MyMixedCaseProperty) – UPPER_CAMEL_CASE_WITH_SPACES (My Mixed Case Property) – CASE_INSENSITIVE (mYmIxEdCaSePrOpErTy) – Or a custom implementation • JsonbConfig – withPropertyNamingStrategy(…): 71
  72. 72. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • Strategies: – LEXICOGRAPHICAL (A-Z) – ANY – REVERSE (Z-A) • Annotation – @JsonbPropertyOrder on class • JsonbConfig – withPropertyOrderStrategy(…) 72 Property Order Strategy @JsonbPropertyOrder(ANY) public class Foo { public int bar2; public int bar1; }
  73. 73. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • Annotation – @JsonbTransient 73 Ignoring Properties public class Customer { public int id; public String name; @JsonbTransient public BigDecimal salary; }
  74. 74. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • PropertyVisibilityStrategy interface • Annotation – @JsonbVisibility • JsonbConfig – withPropertyVisibilityStrategy(…) 74 Property Visibility public interface PropertyVisibilityStrategy { boolean isVisible(Field field); boolean isVisible(Method method); } public class MuStrategy implements PropertyVisibilityStrategy { /* ... */ } @JsonbVisibility(MyStrategy.class) public class Bar { private int field1; private int field2; }
  75. 75. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • Null fields are skipped by default • Annotation – @JsonbNillable • JsonbConfig – withNullValues(true) 75 Null Handling public class Customer { public int id = 1; @JsonbNillable public String name = null; } @JsonbNillable public class Customer { public int id = 1; public String name = null; }
  76. 76. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. public class Customer { public int id; public String name; @JsonbCreator public static Customer getFromDb(int id) { return CustomerDao.getByPrimaryKey(id); } } public class Order { public int id; public Customer customer; } { "id": 123, "customer": { "id": 562, } } 76 Custom Instantiation
  77. 77. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • Annotations – @JsonbDateFormat – @JsonbNumberFormat • JsonbConfig – withDateFormat(…) – withLocale(…) 77 Date/Number Format public class FormatSample { public Date defaultDate; @JsonbDateFormat("dd.MM.yyyy") public Date formattedDate; public BigDecimal defaultNumber; @JsonbNumberFormat(“#0.00") public BigDecimal formattedNumber; }
  78. 78. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • Supported encodings – BYTE (default) – BASE_64 – BASE_64_URL • JsonbConfig – withBinaryDataStrategy(…) 78 Binary Data Encoding JsonbConfig config = new JsonbConfig() .withBinaryDataStrategy( BinaryDataStrategy.BASE_64); Jsonb jsonb = JsonbBuilder.create(config); String json = jsonb.toJson(obj);
  79. 79. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. I-JSON • I-JSON (”Internet JSON”) is a restricted profile of JSON – https://tools.ietf.org/html/draft-ietf-json-i-json-06 • JSON-B fully supports I-JSON by default with three exceptions: – JSON Binding does not restrict the serialization of top-level JSON texts that are neither objects nor arrays. The restriction should happen at application level. – JSON Binding does not serialize binary data with base64url encoding. – JSON Binding does not enforce additional restrictions on dates/times/duration. • JsonbConfig – withStrictIJSON(true) 79
  80. 80. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • Inspired by JAXB • Annotations – @JsonbTypeAdapter annotation • JsonbConfig – withAdapters(…) 80 Adapters public interface JsonbAdapter<Original, Adapted> { Adapted adaptToJson(Original obj); Original adaptFromJson(Adapted obj); } @JsonbTypeAdapter(AnimalAdapter.class) public Animal animal; JsonbConfig config = new JsonbConfig() .withAdapters(new AnimalAdapter());
  81. 81. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. • Low level control on serialization/deserialization • Annotations – @JsonbTypeSerializer – @JsonbTypeDeserializer • JsonbConfig – withSerializers(…) – withDeserializers(…) 81 Serializers/Deserializers public interface JsonbSerializer<T> { void serialize(T obj, JsonGenerator generator, SerializationContext ctx); public interface JsonbDeserializer<T> { T deserialize(JsonParser parser, DeserializationContext ctx, Type rtType); } @JsonbTypeSerializer(AnimalSerializer.class) @JsonbTypeDeserializer(AnimalDeserializer.class) public Animal animal; JsonbConfig config = new JsonbConfig() .withSerializers(new AnimalSerializer()) .withDeserializers(new AnimalDeserializer());
  82. 82. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON-B Demo • GitHub – https://github.com/m0mus/JavaOne2016-JSONB-Demo • Demonstrates – Default mapping – Adapters – Serializers – Mapping of generic class 82
  83. 83. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. JSON-B Web Sites • JSON-B web site – http://json-b.net • JSON-B on GitHub – https://github.com/json-b • JCP.org page – https://www.jcp.org/en/jsr/detail?id=367 • Specification Project: – https://java.net/projects/jsonb-spec 83
  84. 84. Copyright © 2016, Oracle and/or its affiliates. All rights reserved. Q & A 84

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