includeAdditionalProperties cannot work when annotationStyle is 'gson'

[KengoTODA]

Here is my MCVE project. You can find the following configurations in build.gradle:

jsonSchema2Pojo {
  source = files('src/schema/schema.json')
  targetPackage = 'com.example'
  annotationStyle = 'gson'
  includeAdditionalProperties = true
}

When you run ./gradlew generateJsonSchema2Pojo --info in this MCVE project, you'll find that the generated class has no additionalProperties. You'll also find that the includeAdditionalProperties option is not provided to the jsonschema2pojo's Java API. If I set 'none' to annotationStyle, includeAdditionalProperties is not provided to the Java API either, but it actually generates additionalProperties field.

Here is INFO level log for your reference:

> Task :generateJsonSchema2Pojo
Caching disabled for task ':generateJsonSchema2Pojo' because:
  Build cache is disabled
  Caching has not been enabled for the task
Task ':generateJsonSchema2Pojo' is not up-to-date because:
  Output property '$1' file /home/kengo/github/js2p-gradle-reproduction/build/generated-sources/js2p has been removed.
  Output property '$1' file /home/kengo/github/js2p-gradle-reproduction/build/generated-sources/js2p/com has been removed.
  Output property '$1' file /home/kengo/github/js2p-gradle-reproduction/build/generated-sources/js2p/com/example has been removed.
Using this configuration:
generateBuilders = false
includeJsonTypeInfoAnnotation = false
usePrimitives = false
source = [/home/kengo/github/js2p-gradle-reproduction/src/schema/schema.json]
targetDirectory = /home/kengo/github/js2p-gradle-reproduction/build/generated-sources/js2p
targetPackage = com.example
propertyWordDelimiters = [-,  , _]
useLongIntegers = false
useBigIntegers = false
useDoubleNumbers = true
useBigDecimals = false
includeHashcodeAndEquals = true
includeConstructors = false
constructorsRequiredPropertiesOnly = false
includeRequiredPropertiesConstructor = false
includeAllPropertiesConstructor = true
includeCopyConstructor = false
includeToString = true
toStringExcludes = []
annotationStyle = gson
useTitleAsClassname = false
inclusionLevel = class org.jsonschema2pojo.InclusionLevel
customAnnotator = org.jsonschema2pojo.NoopAnnotator
customRuleFactory = org.jsonschema2pojo.rules.RuleFactory
includeJsr303Annotations = false
includeJsr305Annotations = false
useOptionalForGetters = false
sourceType = jsonschema
removeOldOutput = false
outputEncoding = UTF-8
useJodaDates = false
useJodaLocalDates = false
useJodaLocalTimes = false
dateTimeType = null
dateType = null
timeType = null
parcelable = false
serializable = false
initializeCollections = true
classNamePrefix = 
classNameSuffix = 
fileExtensions = []
includeGetters = true
includeSetters = true
targetVersion = 1.6
includeDynamicAccessors = false
includeDynamicGetters = false
includeDynamicSetters = false
includeDynamicBuilders = false
formatDates = false
formatTimes = false
formatDateTimes = false
customDatePattern = null
customTimePattern = null
customDateTimePattern = null
refFragmentPathDelimiters = #/.
sourceSortOrder = OS
targetLanguage = null
formatTypeMapping = [:]
useInnerClassBuilders = false
includeConstructorPropertiesAnnotation = false
     
Initializing class com.github.eirnym.js2p.GradleRuleLogger
:generateJsonSchema2Pojo (Thread[Execution worker for ':',5,main]) completed. Took 0.014 secs.

[KengoTODA]

I found that this problem comes from the core jsonschema2pojo implementation:

https://github.com/joelittlejohn/jsonschema2pojo/blob/47456b34e5a028e0c8d56d3ca00a8e57be509ac5/jsonschema2pojo-core/src/main/java/org/jsonschema2pojo/GsonAnnotator.java#L59

I'll use another annotation style to avoid. Thank you :)