JSON support in Java EE 8

Copyright©2016,Oracleand/oritsaffiliates.Allrightsreserved.|

JSONSupportinJavaEE8LukasJungmannJSON-PEGMemberlukas.jungmann@oracle.com@jlukasNovember16,2016


SafeHarborStatementThefollowingisintendedtooutlineourgeneralproductdirecSon.ItisintendedforinformaSonpurposesonly,andmaynotbeincorporatedintoanycontract.Itisnotacommitmenttodeliveranymaterial,code,orfuncSonality,andshouldnotberelieduponinmakingpurchasingdecisions.Thedevelopment,release,andSmingofanyfeaturesorfuncSonalitydescribedforOracle’sproductsremainsatthesolediscreSonofOracle.

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Copyright©2016,Oracleand/oritsaffiliates.Allrightsreserved.| 3

LukasJungmann

•  So#wareDeveloper@Oracle•  JSON-B(JSR-367)EGmember•  JSON-P(JSR-374)EGmember•  JPA(JSR-338)Speclead•  EclipseLinkprojectcommiJer


ProgramAgenda

IntroducSon

JSONProcessing

JSONBinding

Q&A

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IntroducSon

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JSONSupportinJavaEE8•  JSONProcessingAPI– StandardAPItoparse,generate,transform,queryJSON– ObjectModelandStreamingAPI•  similartoDOMandStAX

•  JSONBindingAPI– BindingJSONdocumentstoJavaobjects•  similartoJAXB

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JSONProcessing

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JsonParser•  JsonParser– ParsesJSONinastreamingwayfrominputsources– SimilartoStAX’sXMLStreamReader,apullparser

• Createdusing:•  Json.createParser(…),Json.createParserFactory().createParser(…)

• OpSonally,configuredwithfeatures• Parserstateevents:– START_ARRAY,START_OBJECT,KEY_NAME,VALUE_STRING,VALUE_NUMBER,VALUE_TRUE,VALUE_FALSE,VALUE_NULL,END_OBJECT,END_ARRAY

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JsonParser{ ! "name": ! "John Doe", ! "age": ! 35, ! "phoneNumbers": ! [ ! { ! "type": "home", ! "number": "123-456-789" ! } ! ] !} !


JsonParserSTART_OBJECT !{ !

"name": ! "John Doe", ! "age": ! 35, ! "phoneNumbers": ! [ ! { ! "type": "home", ! "number": "123-456-789" ! } ! ] !} !


JsonParserSTART_OBJECT!KEY_NAME !

{ ! "name": ! "John Doe", ! "age": ! 35, ! "phoneNumbers": ! [ ! { ! "type": "home", ! "number": "123-456-789" ! } ! ] !} !


JsonParserSTART_OBJECT!KEY_NAME !VALUE_STRING !



JsonParserSTART_OBJECT!KEY_NAME !VALUE_STRING !KEY_NAME !



JsonParserSTART_OBJECT!KEY_NAME !VALUE_STRING !KEY_NAME !VALUE_NUMBER !



JsonParserSTART_OBJECT!KEY_NAME !VALUE_STRING !KEY_NAME !VALUE_NUMBER !KEY_NAME !



JsonParserSTART_OBJECT!KEY_NAME !VALUE_STRING !KEY_NAME !VALUE_NUMBER !KEY_NAME !START_ARRAY !



JsonParserSTART_OBJECT!KEY_NAME !VALUE_STRING !KEY_NAME !VALUE_NUMBER !KEY_NAME !START_ARRAY !START_OBJECT !



JsonParserSTART_OBJECT!KEY_NAME !VALUE_STRING !KEY_NAME !VALUE_NUMBER !KEY_NAME !START_ARRAY !START_OBJECT !KEY_NAME, KEY_STRING !



JsonParserSTART_OBJECT!KEY_NAME !VALUE_STRING !KEY_NAME !VALUE_NUMBER !KEY_NAME !START_ARRAY !START_OBJECT !KEY_NAME, KEY_STRING !KEY_NAME, KEY_STRING !



JsonParserSTART_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 !



JsonParserSTART_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 !



JsonParserSTART_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 !




JsonParser p = Json.createParser(...); !!



JsonParser p = Json.createParser(...); !Event e = p.next(); // START_OBJECT !!



JsonParser p = Json.createParser(...); !Event e = p.next(); // START_OBJECT !parser.next(); // KEY_NAME!!



JsonParser p = Json.createParser(...); !Event e = p.next(); // START_OBJECT !parser.next(); // KEY_NAME!parser.getString(); // name!!



JsonParser p = Json.createParser(...); !Event e = p.next(); // START_OBJECT !parser.next(); // KEY_NAME!parser.getString(); // name !parser.next(); // VALUE_STRING!!



JsonParser p = Json.createParser(...); !Event e = p.next(); // START_OBJECT !parser.next(); // KEY_NAME!parser.getString(); // name !parser.next(); // VALUE_STRING !parser.getString(); // John Doe!!



JsonParser p = Json.createParser(...); !Event e = p.next(); // START_OBJECT !parser.next(); // KEY_NAME!parser.getString(); // name !parser.next(); // VALUE_STRING !parser.getString(); // John Doe !parser.next(); // KEY_NAME!!



JsonParser p = Json.createParser(...); !Event e = p.next(); // START_OBJECT !parser.next(); // KEY_NAME!parser.getString(); // name !parser.next(); // VALUE_STRING !parser.getString(); // John Doe !parser.next(); // KEY_NAME!parser.getString(); // age!!



JsonParser p = Json.createParser(...); !Event e = p.next(); // START_OBJECT !parser.next(); // KEY_NAME!parser.getString(); // name !parser.next(); // VALUE_STRING !parser.getString(); // John Doe !parser.next(); // KEY_NAME!parser.getString(); // age!parser.next(); // VALUE_NUMBER!!



JsonParser p = Json.createParser(...); !Event e = p.next(); // START_OBJECT !parser.next(); // KEY_NAME!parser.getString(); // name !parser.next(); // VALUE_STRING !parser.getString(); // John Doe !parser.next(); // KEY_NAME!parser.getString(); // age!parser.next(); // VALUE_NUMBER !parser.getInt (); // 35 !!!


JsonGenerator• GeneratesJSONinastreamingwaytooutputsources– SimilartoStAX’sXMLStreamWriter

• Createdusing:– Json.createGenerator(…)– Json.createGeneratorFactory().createGenerator(…)

• OpSonally,configuredwithfeatures– e.g.prenyprinSng

• Allowsmethodchaining

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JsonGeneratorJsonGenerator 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" ! } !] !


ObjectModelAPI• BuildertobuildJsonObjectandJsonArrayfromscratch• Allowsmethodchaining•  Type-safe(cannotmixarrayandobjectbuildingmethods)• CanalsouseexisSngJsonObjectandJsonArrayinabuilder

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ObjectModelAPIJsonArray 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" ! } !] !


JSON-P1.1• UpdateJSON-Pspectostaycurrentwithemergingstandards(RFC7159)•  SupportforIETFstandardson– JSONPointer(RFC6901)– JSONPatch(RFC6902)– JSONMergePatch(RFC7396)

• AddediSng/transformaSonoperaSonstoJSONobjectsandarrays•  SupportforastreamingAPI,togetherwithCollectors•  SupportforprocessingbigJSON,e.g.addfilterstoJSONparsing.

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JsonPointer•  IETFRFC6901•  StringsyntaxforidenSfyingaspecificvalue– /phone/mobile– /parents/0

•  Specialcharacters– "/"—>"~1"– "~"—>"~0"

• Absolute

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JSONPointerSampleJsonArray dogs = . . .; !

JsonPointer pointer = ! Json.createPointer("/1/breed"); !

JsonValue breed = ! pointer.getValue(dogs); !

p.replace(dogs, ! Json.createValue("English Bulldog")); !

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[ ! { ! "name": "Cassidy", ! "breed": "English Bulldog", ! "age": 6 ! }, ! { ! "name": "Falco", ! "breed": "Pug", ! "age": 4 ! }!] !


JsonPatch•  IETFRFC6902• ModifyPartsofJSONdocument• PatchisaJSONdocumentitself• OperaSons:– Add,replace,remove,move,copy,test

• HTTPPATCHmethod(applicaSon/json-patch+json)

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JSONPatchSample[ ! { "op": "replace", ! "path": "/1/breed", ! "value": "English Bulldog" }, ! { "op": "remove", ! "path": "/2" } !] !

[ ! { ! "name": "Cassidy", ! "breed": "English Bulldog", ! "age": 6 ! }, ! { ! "name": "Falco", ! "breed": "Pug", ! "age": 4 ! }, ! { ! "name": "Funes", ! "breed": "Frenchie", ! "age": 2 ! }!] !



[ ! { ! "name": "Cassidy", ! "breed": "English Bulldog", ! "age": 6 ! }, ! { ! "name": "Falco", ! "breed": "English Bulldog", ! "age": 4 ! }, ! { ! "name": "Funes", ! "breed": "Frenchie", ! "age": 2 ! }!] !



[ ! { ! "name": "Cassidy", ! "breed": "English Bulldog", ! "age": 6 ! }, ! { ! "name": "Falco", ! "breed": "English Bulldog", ! "age": 4 ! } !] !


JSONBinding

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JSONBinding• APItoserialize/deserializeJavaobjectsto/fromJSONdocuments– SimilartoJAX-B– Standardizesthecurrenttechnologies(Jackson,Genson,Gson)

• DefaultmappingbetweenclassesandJSON• CustomizaSonAPIs– AnnotaSons(@JsonbProperty,@JsonbNillable)– RunSmeconfiguraSonbuilder

• NaturalfollowontoJSON-P– ClosestheJSONsupportgap– Allowstochangeproviders

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• NoconfiguraSon,noannotaSons•  Thescope:– BasicTypes– SpecificJDKTypes– Dates– Classes– CollecSons/Arrays– EnumeraSons– JSON-P

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DefaultMappingimport javax.json.bind.Jsonb; !import javax.json.bind.JsonbBuilder; !!// Create with default config !Jsonb jsonb = JsonbBuilder.create(); !


JSON-BEnginepublic 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); !} !


JSON-BSample

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Dog dog1 = new Dog(); !dog1.setName("Cassidy"); !dog1.setBreed("English Bulldog"); !dog1.setAge(6); !!Dog dog2 = new Dog(); !dog2.setName("Falco"); !dog2.setBreed("English Bulldog"); !dog2.setAge(4); !!List<Dog> dogs = new ArrayList<>(); !dogs.add(dog1); !dogs.add(dog2); !!Jsonb jsonb = JsonbBuilder.create(); !jsonb.toJson(dogs); !

[ ! { ! "name": "Cassidy", ! "breed": "English Bulldog", ! "age": 6 ! }, ! { ! "name": "Falco", ! "breed": "English Bulldog", ! "age": 4 ! } !] !


BasicTypes– 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)

SpecificTypes– java.math.BigInteger– java.math.BigDecimal– java.net.URL– java.net.URI– java.uSl.OpSonal– java.uSl.OpSonalInt– java.uSl.OpSonalLong– java.uSl.OpSonalDouble

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BasicandSpecificTypes


Date/Time

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java.uSl.Date ISO_DATE_TIME

java.uSl.Calendar,java.uSl.GregorianCalendar ISO_DATEiftoSmeinformaSonpresent,otherwiseISO_DATE_TIME

Java.uSl.TimeZone,java.uSl.SimpleTimeZone NormalizedCustomId(seeTimeZonejavadoc)

java.Sme.Instant ISO_INSTANT

java.Sme.LocalDate ISO_LOCAL_DATE

java.Sme.LocalTime ISO_LOCAL_TIME

java.Sme.LocalDateTime ISO_LOCAL_DATE_TIME

java.Sme.ZonedDateTime ISO_ZONED_DATE_TIME

java.Sme.OffsetDateTime ISO_OFFSET_DATE_TIME

java.Sme.OffsetTime ISO_OFFSET_TIME

java.Sme.ZoneId NormalizedZoneIdasspecifiedinZoneIdjavadoc

java.Sme.ZoneOffset NormalizedZoneIdasspecifiedinZoneOffsetjavadoc

java.Sme.DuraSon ISO8601secondsbasedrepresentaSon

java.Sme.Period ISO8601periodrepresentaSon


Date/TimeSamples

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// java.util.Date!SimpleDateFormat sdf = new SimpleDateFormat("dd.MM.yyyy");!Date parsedDate = sdf.parse("25.10.2015"); !jsonb.toJson(parsedDate); // ”2015-10-25T00:00:00" !!// java.util.Calendar!Calendar dateCalendar = Calendar.getInstance(); !dateCalendar.clear(); !dateCalendar.set(2015, 10, 25); !jsonb.toJson(dateCalendar); // ”2015-10-25” !!// java.time.Instant!jsonb.toJson(Instant.parse("2015-10-25T23:00:00Z")); // ”2015-10-25T23:00:00Z” !!// 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"!


Arrays/CollecSons• CollecSon• Map•  Set• HashSet• NavigableSet•  SortedSet•  TreeSet•  LinkedHashSet•  TreeHashSet• HashMap

• NavigableMap•  SortedMap•  TreeMap•  LinkedHashMap•  TreeHashMap•  List• ArrayList•  LinkedList• Deque• ArrayDeque

• Queue• PriorityQueue•  EnumSet•  EnumMap

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•  javax.json.JsonArray•  javax.json.JsonStructure•  javax.json.JsonValue•  javax.json.JsonPointer•  javax.json.JsonString•  javax.json.JsonNumber•  javax.json.JsonObject

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JSON-PTypes// JsonObject !JsonBuilderFactory f = !

Json.createBuilderFactory(null); !!JsonObject jsonObject = !

f.createObjectBuilder() ! .add(“name", "Jason") ! .add(“city", "Prague") ! .build(); !!jsonb.toJson(jsonObject); !


Classes• PublicandprotectednestedandstaMcnestedclasses• Anonymousclasses(serializaSononly)•  Inheritanceissupported• Defaultno-argumentconstructorisrequiredfordeserializaSon

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Fields•  Finalfieldsareserialized•  StaMcfieldsareskipped•  Transientfieldsareskipped• Nullfieldsareskipped•  Fieldsorder– Lexicographicalorder– Parentclassfieldsareserializedbeforechildclassfields

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public class Parent { ! public int parentB; ! public int parentA; !} !

{ ! "parentA": 1, ! "parentB": 2 !} !

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FieldsOrderSample


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 !} !

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FieldsOrderSample


SerializaMon•  ExisSngfieldswithpublicgeners• Publicfieldswithnogeners• Publicgener/senerpairwithoutacorrespondingfield

• DeserializaMon•  ExisSngfieldswithpublicseners• Publicfieldswithnoseners• Publicgener/senerpairwithoutacorrespondingfield

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ScopeandFieldAccessStrategy


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 !} !

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ScopeandFieldAccessStrategy


• AnnotaSons• RunSmeconfiguraSon– JsonbConfig– JsonbBuilder

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JSON-BEngineConfiguraSonJsonbConfig config = new JsonbConfig() ! .withFormatting(…) ! .withNullValues(…) ! .withEncoding(…) ! .withStrictIJSON(…) ! .withPropertyNamingStrategy(…) ! .withPropertyOrderStrategy(…) ! .withPropertyVisibilityStrategy(…) ! .withAdapters(…) ! .withBinaryDataStrategy(…); !!Jsonb jsonb = JsonbBuilder.newBuilder() ! .withConfig(…) ! .withProvider(…) ! .build(); !!


CustomizaSons• Propertynames• Propertyorder•  IgnoringproperSes• Nullhandling• CustominstanSaSon

•  Fieldsvisibility• Adapters• Date/NumberFormats• BinaryEncoding


• AnnotaSon– @JsonbProperty

•  Scope:– Field– Gener/Sener– Parameter

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PropertyNamespublic 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; ! } !} !!


PropertyNamingStrategy•  Supportednamingstrategies– 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(MyMixedCaseProperty)– CASE_INSENSITIVE(mYmIxEdCaSePrOpErTy)– OracustomimplementaSon

•  JsonbConfig– withPropertyNamingStrategy(…):

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•  Strategies:– LEXICOGRAPHICAL(A-Z)– ANY– REVERSE(Z-A)

• AnnotaSon– @JsonbPropertyOrderonclass

•  JsonbConfig– withPropertyOrderStrategy(…)

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PropertyOrderStrategy@JsonbPropertyOrder(ANY)!public class Foo { ! public int bar2; ! public int bar1; !} !


• AnnotaSon– @JsonbTransient

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IgnoringProperSespublic class Customer { ! public int id; !

public String name; !!

@JsonbTransient! public BigDecimal salary; !} !


• PropertyVisibilityStrategyinterface• AnnotaSon– @JsonbVisibility

•  JsonbConfig– withPropertyVisibilityStrategy(…)

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PropertyVisibilitypublic 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; !} !!!


• Nullfieldsareskippedbydefault• AnnotaSon– @JsonbNillable

•  JsonbConfig– withNullValues(true)

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NullHandlingpublic class Customer { ! public int id = 1; !! @JsonbNillable! public String name = null; !} !!@JsonbNillable!public class Customer { ! public int id = 1; ! public String name = null; !} !


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, ! }!} !!

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CustomInstanSaSon


• AnnotaSons– @JsonbDateFormat– @JsonbNumberFormat

•  JsonbConfig– withDateFormat(…)– withLocale(…)

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Date/NumberFormatpublic class FormatSample { ! public Date defaultDate; !! @JsonbDateFormat("dd.MM.yyyy") ! public Date formattedDate; !! public BigDecimal defaultNumber; !! @JsonbNumberFormat(“#0.00") ! public BigDecimal formattedNumber; !} !


•  Supportedencodings– BYTE(default)– BASE_64– BASE_64_URL

•  JsonbConfig– withBinaryDataStrategy(…)

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BinaryDataEncodingJsonbConfig config = new JsonbConfig() ! .withBinaryDataStrategy(! BinaryDataStrategy.BASE_64); !!Jsonb jsonb = JsonbBuilder.create(config); !String json = jsonb.toJson(obj); !!!


I-JSON•  I-JSON(”InternetJSON”)isarestrictedprofileofJSON– hnps://tools.iez.org/html/dra{-iez-json-i-json-06

•  JSON-BfullysupportsI-JSONbydefaultwiththreeexcepSons:– JSONBindingdoesnotrestricttheserializaSonoftop-levelJSONtextsthatareneitherobjectsnorarrays.TherestricSonshouldhappenatapplicaSonlevel.– JSONBindingdoesnotserializebinarydatawithbase64urlencoding.– JSONBindingdoesnotenforceaddiSonalrestricSonsondates/Smes/duraSon.

•  JsonbConfig– withStrictIJSON(true)

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•  InspiredbyJAXB• AnnotaSons– @JsonbTypeAdapterannotaSon

•  JsonbConfig– withAdapters(…)

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Adapterspublic 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()); !!!


•  LowlevelcontrolonserializaSon/deserializaSon• AnnotaSons– @JsonbTypeSerializer– @JsonbTypeDeserializer

•  JsonbConfig– withSerializers(…)– withDeserializers(…)

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Serializers/Deserializerspublic 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()); !! !


References•  JSON-PspecificaSon:– hnps://json-processing-spec.java.net/

•  JSON-PreferenceimplementaSon:– hnps://jsonp.java.net/

•  JSON-B:– hnp://json-b.net/

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Q&A

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Thankyou!

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Date post:	08-Jan-2017
Category:	Software
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