[REQ][JAVA]: Include @JsonProperty to fields in java model class when @lombok.Data is used with Jackson (serializationLibrary)

Description

Hi Team, Thanks for the great contribution of openapi-generator, This project helped me to generate a spring boot application automatically from openapi-spec with in few seconds (instead of manual work which takes minimum 1 or 2 days.)

1. When I use the @lombok.Data in additionalModelTypeAnnotations with jackson serializationLibrary, the @JsonProperty annotation is missing in the generated java pojo model (because its included in the setter method of pojo only)
2. In my use case I'm using Snake case for schema definition in my openapi spec
   Eg: field name
   in openapi spec: pet_purchased_date
   in java pojo class: petPurchasedDate
3. It is causing issue when the input is converted to model in java

config:
openApiGenerate {
generatorName = "spring"
inputSpec = "$rootDir/openapi.yaml".toString()
outputDir = "$buildDir/openapi".toString()
apiPackage = "org.petstore.rest"
modelPackage = "org.petstore.interfaces"
apiFilesConstrainedTo = [""]
modelFilesConstrainedTo = [""]
configOptions = [useSpringBoot3: "true", serializationLibrary: "jackson", hideGenerationTimestamp: "true", additionalModelTypeAnnotations: "@lombok.Data; @lombok.AllArgsConstructor; @lombok.NoArgsConstructor;"]
skipValidateSpec = true
globalProperties = [skipFormModel: "false"]
importMappings = [Problem:"org.zalando.problem.Problem", Data:"lombok.Data", NoArgsConstructor:"lombok.NoArgsConstructor", AllArgsConstructor:"lombok.AllArgsConstructor"]
}

Solution

Include the below line as mentioned as per below image in the pojo.mustache
{{#lombok.Data}}{{#jackson}}@JsonProperty("{{baseName}}"){{/jackson}}{{/lombok.Data}}

pojo.mustache.json

Thanks
Vishnu

Start with the Java generator's pojo.mustache template and reproduce the provided configuration using the spring generator, Jackson, Lombok @Data, and a snake_case field such as pet_purchased_date. Done means the generated model includes @JsonProperty for fields when Lombok @Data and Jackson are enabled, preserving the OpenAPI field name.