[JAVA]referenced date time object is replaced by OffsetDateTime

Description

Custom DateTime definition defined in the open API definition is not handled and instead OffsetDateTime object is used.

Swagger-codegen version

latest from swagger editor ( http://editor.swagger.io/ )

Swagger declaration file content or url

https://app.swaggerhub.com/apis/myapi37/DateTimeBug/1

Command line used for generation

No, generated from swagger editor

Steps to reproduce

Use the provided open API definition and generate java client SDK for it.
Date Time model won't get generated and DateTimePayload contains list of OffsetDateTime instead of what is referenced in the definition (DateTime).

But if DateTime definition name is changed to DateTimeCommon, generated SDK contains DateTimeCommon model class and DateTimePayload class will have list of type DateTimeCommon class.

Looks like the problem is with the name "DateTime" in the below definition
"DateTime": {
"allOf": [
{
"$ref": "#/definitions/DateTimeCommonData"
},
{
"type": "object",
"properties": {}
}
]
}

Related issues/PRs

Suggest a fix/enhancement

Start with the SwaggerHub definition linked in the report and generate the Java client SDK from it. Compare the generated DateTimePayload and model classes with the DateTime and DateTimeCommonData definitions; done means the referenced DateTime model is generated and used instead of OffsetDateTime.