1. i created my yaml with openapi 3.0 specification

2. generated the go server stub code and getting below warnings.

3. WARN - o.o.codegen.utils.ModelUtils - Multiple schemas found, returning only the first one

4. WARN o.o.codegen.DefaultCodegen - The following schema has undefined (null) baseType. It could be due to form parameter defined in OpenAPI v2 spec with incorrect consumes. A correct 'consumes' for form parameters should be 'application/x-www-form-urlencoded' or 'multipart/form-data'
   [main] WARN o.o.codegen.DefaultCodegen - schema: class ComposedSchema {
   class Schema {
   title: null
   multipleOf: null
   maximum: null
   exclusiveMaximum: null
   minimum: null
   exclusiveMinimum: null
   maxLength: null
   minLength: null
   pattern: null
   maxItems: null
   minItems: null
   uniqueItems: null
   maxProperties: null
   minProperties: null
   required: null
   type: null
   not: null
   properties: null
   additionalProperties: null
   description: null
   format: null
   $ref: null
   nullable: null
   readOnly: null
   writeOnly: null
   example: null
   externalDocs: null
   deprecated: null
   discriminator: null
   xml: null
   }
   allOf: null
   anyOf: null
   oneOf: [class Schema {
   title: null
   multipleOf: null
   maximum: null
   exclusiveMaximum: null
   minimum: null
   exclusiveMinimum: null
   maxLength: null
   minLength: null
   pattern: null
   maxItems: null
   minItems: null
   uniqueItems: null
   maxProperties: null
   minProperties: null
   required: null
   type: null
   not: null
   properties: null
   additionalProperties: null
   description: null
   format: null
   $ref: #/components/schemas/AppTerminationNotificationSubscription
   nullable: null
   readOnly: null
   writeOnly: null
   example: null
   externalDocs: null
   deprecated: null
   discriminator: null
   xml: null
   }, class Schema {
   title: null
   multipleOf: null
   maximum: null
   exclusiveMaximum: null
   minimum: null
   exclusiveMinimum: null
   maxLength: null
   minLength: null
   pattern: null
   maxItems: null
   minItems: null
   uniqueItems: null
   maxProperties: null
   minProperties: null
   required: null
   type: null
   not: null
   properties: null
   additionalProperties: null
   description: null
   format: null
   $ref: #/components/schemas/SerAvailabilityNotificationSubscription
   nullable: null
   readOnly: null
   writeOnly: null
   example: null
   externalDocs: null
   deprecated: null
   discriminator: null
   xml: null
   }]
   }

5. WARN o.o.codegen.DefaultCodegen - codegenModel is null. Default to UNKNOWN_BASE_TYPE

One more Observation like model_inline_response_*.go files are not generating which are generated in 2.0.