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title
Documentation for the java generator

METADATA

Property Value Notes
generator name java pass this to the generate command after -g
generator stability STABLE
generator type CLIENT
generator language Java
generator language version 17
generator default templating engine handlebars
helpMsg Generates a Java client library

Features in this generator:
- v3.0.0 - v3.1.0 OpenAPI Specification support
- Very thorough documentation generated in the style of javadocs
- Input types constrained for a Schema in SomeSchema.validate
- validate method can accept arbitrary List/Map/null/int/long/double/float/String json data
- Immutable List output classes generated and returned by validate for List<?> input
- Immutable Map output classes generated and returned by validate for Map<?, ?> input
- Strictly typed list input can be instantiated in client code using generated ListBuilders
- Strictly typed map input can be instantiated in client code using generated MapBuilders
- Sequential map builders are generated ensuring that required properties are set before build is invoked. Looks like:
- new MapBuilder().requiredA("a").requiredB("b").build()
- new MapBuilder().requiredA("a").requiredB("b").optionalProp("c").additionalProperty("someAddProp", "d").build()
- Run time type checking and validation when
- validating schema payloads
- instantiating List output class (validation run)
- instantiating Map output class (validation run)
- Note: if needed, validation of json schema keywords can be deactivated via a SchemaConfiguration class
- Enums classes are generated and may be input into Schema.validate or the List/MapBuilder add/setter methods
- The Checker-Framework's NullnessChecker and @Nullable annotations are used in the java client
- ensuring that null pointer exceptions will not happen
- Invalid (in java) property names supported like class, 1var, hi-there etc in
- component schema names
- schema property names (a fallback setter is written in the MapBuilder)
- Generated interfaces are largely consistent with the python code
- Openapi spec inline schemas supported at any depth in any location
- Format support for: int32, int64, float, double, date, datetime, uuid
- Payload values are not coerced when validated, so a date/date-time value can pass other validations that describe the payload only as type string
- enum types are generated for enums of type string/integer/number/boolean/null
- String transmission of numbers supported with type: string, format: number

CONFIG OPTIONS

These options may be applied as additional-properties (cli) or configOptions (plugins). Refer to configuration docs for more details.

Option Description Values Default
allowUnicodeIdentifiers boolean, toggles whether unicode identifiers are allowed in names or not, default is false false
artifactDescription artifact description in generated pom.xml OpenAPI Java
artifactUrl artifact URL in generated pom.xml https://github.com/openapi-json-schema-tools/openapi-json-schema-generator
artifactVersion artifact version in generated pom.xml. This also becomes part of the generated library's filename 1.0.0
buildTool the build automation tool used in generated code
maven
Use maven
gradle
Use gradle
 maven
developerEmail developer email in generated pom.xml team@openapijsonschematools.org
developerName developer name in generated pom.xml OpenAPI-Generator Contributors
developerOrganization developer organization in generated pom.xml OpenAPITools.org
developerOrganizationUrl developer organization URL in generated pom.xml http://openapijsonschematools.org
groupId groupId in generated pom.xml org.openapijsonschematools
invokerPackage root package for generated code org.openapijsonschematools.client
licenseName The name of the license Unlicense
licenseUrl The URL of the license http://unlicense.org
parentArtifactId parent artifactId in generated pom N.B. parentGroupId, parentArtifactId and parentVersion must all be specified for any of them to take effect null
parentGroupId parent groupId in generated pom N.B. parentGroupId, parentArtifactId and parentVersion must all be specified for any of them to take effect null
parentVersion parent version in generated pom N.B. parentGroupId, parentArtifactId and parentVersion must all be specified for any of them to take effect null
scmConnection SCM connection in generated pom.xml scm:git:git@github.com:openapi-json-schema-tools/openapi-json-schema-generator.git
scmDeveloperConnection SCM developer connection in generated pom.xml scm:git:git@github.com:openapi-json-schema-tools/openapi-json-schema-generator.git
scmUrl SCM URL in generated pom.xml https://github.com/openapi-json-schema-tools/openapi-json-schema-generator
snapshotVersion Uses a SNAPSHOT version.
true
Use a SnapShot Version
false
Use a Release Version
 null
sourceFolder source folder for generated code src/main/java
testOutput Set output folder for models and APIs tests ${project.build.directory}/generated-test-sources/openapi

SUPPORTED VENDOR EXTENSIONS

Extension name Description Applicable for Default value
x-enum-varnames A list of strings that defines the enum variable names, must be adjacent to enum SCHEMA []
x-enum-descriptions A list of strings that defines the enum descriptions, must be adjacent to enum SCHEMA []

INSTANTIATION TYPES

Type/Alias Instantiated By
array FrozenList
boolean boolean
integer Number (int, long, float with integer values, double with integer values)
null Void (null)
number Number (int, long, float, double)
object FrozenMap
string String

LANGUAGE PRIMITIVES

  • Boolean
  • Double
  • Float
  • Integer
  • Long
  • Object
  • String
  • boolean
  • byte[]

RESERVED WORDS

  • abstract
  • apiclient
  • apiexception
  • apiresponse
  • assert
  • boolean
  • break
  • byte
  • case
  • catch
  • char
  • class
  • configuration
  • const
  • continue
  • default
  • do
  • double
  • else
  • enum
  • extends
  • final
  • finally
  • float
  • for
  • goto
  • if
  • implements
  • import
  • instanceof
  • int
  • integer
  • interface
  • linkedhashset
  • list
  • localdate
  • localreturntype
  • localvaraccept
  • localvaraccepts
  • localvarauthnames
  • localvarcollectionqueryparams
  • localvarcontenttype
  • localvarcontenttypes
  • localvarcookieparams
  • localvarformparams
  • localvarheaderparams
  • localvarpath
  • localvarpostbody
  • localvarqueryparams
  • long
  • map
  • native
  • new
  • null
  • number
  • package
  • private
  • protected
  • public
  • return
  • short
  • static
  • strictfp
  • string
  • stringutil
  • super
  • switch
  • synchronized
  • this
  • throw
  • throws
  • tostring
  • transient
  • try
  • uuid
  • void
  • volatile
  • while
  • zoneddatetime

FEATURE SET

Client Modification Feature

Name Supported Defined By
BasePath ✗ ToolingExtension
Authorizations ✗ ToolingExtension
UserAgent ✗ ToolingExtension
MockServer ✗ ToolingExtension

Components Feature

Name Supported Defined By
schemas ✓ OAS3
responses ✓ OAS3
parameters ✓ OAS3
examples ✗ OAS3
requestBodies ✓ OAS3
headers ✓ OAS3
securitySchemes ✓ OAS3
links ✗ OAS3
callbacks ✗ OAS3
pathItems ✗ OAS3

Data Type Feature

Name Supported Defined By
Custom ✗ OAS2,OAS3
Int32 ✓ OAS2,OAS3
Int64 ✓ OAS2,OAS3
Integer ✓ OAS2,OAS3
Float ✓ OAS2,OAS3
Double ✓ OAS2,OAS3
Number ✓ OAS2,OAS3
String ✓ OAS2,OAS3
Byte ✗ OAS2,OAS3
Binary ✗ OAS2,OAS3
Boolean ✓ OAS2,OAS3
Date ✓ OAS2,OAS3
DateTime ✓ OAS2,OAS3
Password ✗ OAS2,OAS3
File ✗ OAS2
Uuid ✓ OAS2,OAS3
Array ✓ OAS2,OAS3
Null ✓ OAS3
AnyType ✓ OAS2,OAS3
Object ✓ OAS2,OAS3
Enum ✓ OAS2,OAS3

Documentation Feature

Name Supported Defined By
Readme ✓ ToolingExtension
Servers ✓ OAS3
Security ✓ OAS2,OAS3
ComponentSchemas ✓ OAS3
ComponentResponses ✓ OAS3
ComponentParameters ✓ OAS3
ComponentRequestBodies ✓ OAS3
ComponentHeaders ✓ OAS3
ComponentSecuritySchemes ✓ OAS3
ComponentLinks ✗ OAS3
ComponentCallbacks ✗ OAS3
ComponentPathItems ✗ OAS3
Api ✓ ToolingExtension

Global Feature

Name Supported Defined By
Info ✓ OAS2,OAS3
Servers ✓ OAS3
Paths ✓ OAS2,OAS3
Webhooks ✗ OAS3
Components ✓ OAS3
Security ✓ OAS2,OAS3
Tags ✗ OAS2,OAS3
ExternalDocs ✗ OAS2,OAS3

Operation Feature

Name Supported Defined By
Responses_HttpStatusCode ✓ OAS3
Responses_RangedResponseCodes ✓ OAS3
Responses_Default ✓ OAS3
Responses_RedirectionResponse ✓ OAS3
Security ✓ OAS2,OAS3
Servers ✓ OAS3

Parameter Feature

Name Supported Defined By
Name ✗ OAS2,OAS3
Required ✗ OAS2,OAS3
In_Path ✗ OAS2,OAS3
In_Query ✗ OAS2,OAS3
In_Header ✗ OAS2,OAS3
In_Cookie ✗ OAS3
Style_Matrix ✗ OAS3
Style_Label ✗ OAS3
Style_Form ✗ OAS3
Style_Simple ✗ OAS3
Style_SpaceDelimited ✗ OAS3
Style_PipeDelimited ✗ OAS3
Style_DeepObject ✗ OAS3
Explode ✗ OAS3
Schema ✗ OAS3
Content ✗ OAS3

Schema Feature

Name Supported Defined By
AdditionalProperties ✓ OAS2,OAS3
AllOf ✓ OAS2,OAS3
AnyOf ✓ OAS3
Const ✓ OAS3
Contains ✓ OAS3
Default ✓ OAS2,OAS3
DependentRequired ✓ OAS3
DependentSchemas ✓ OAS3
Discriminator ✗ OAS2,OAS3
Else ✓ OAS3
Enum ✓ OAS2,OAS3
ExclusiveMinimum ✓ OAS2,OAS3
ExclusiveMaximum ✓ OAS2,OAS3
Format ✓ OAS2,OAS3
If ✓ OAS3
Items ✓ OAS2,OAS3
MaxContains ✓ OAS3
MaxItems ✓ OAS2,OAS3
MaxLength ✓ OAS2,OAS3
MaxProperties ✓ OAS2,OAS3
Maximum ✓ OAS2,OAS3
MinContains ✓ OAS3
MinItems ✓ OAS2,OAS3
MinLength ✓ OAS2,OAS3
MinProperties ✓ OAS2,OAS3
Minimum ✓ OAS2,OAS3
MultipleOf ✓ OAS2,OAS3
Not ✓ OAS3
Nullable ✓ OAS3
OneOf ✓ OAS3
Pattern ✓ OAS2,OAS3
PatternProperties ✓ OAS3
PrefixItems ✓ OAS3
Properties ✓ OAS2,OAS3
PropertyNames ✓ OAS3
Ref ✓ OAS2,OAS3
Required ✓ OAS2,OAS3
Then ✓ OAS3
Type ✓ OAS2,OAS3
UnevaluatedItems ✓ OAS3
UnevaluatedProperties ✓ OAS3
UniqueItems ✓ OAS2,OAS3
Xml ✗ OAS2,OAS3

Security Feature

Name Supported Defined By
HTTP_Basic ✓ OAS2,OAS3
ApiKey ✓ OAS2,OAS3
OpenIDConnect ✗ OAS3
HTTP_Bearer ✓ OAS2,OAS3
OAuth2_Implicit ✗ OAS2,OAS3
OAuth2_Password ✗ OAS2,OAS3
OAuth2_ClientCredentials ✗ OAS2,OAS3
OAuth2_AuthorizationCode ✗ OAS2,OAS3

Wire Format Feature

Name Supported Defined By
JSON ✓ OAS2,OAS3
XML ✗ OAS2,OAS3
PROTOBUF ✗ ToolingExtension
Custom ✗ OAS2,OAS3