Swagger UI- Swagger UI is Sending Blank RequestBody Even though it is specified as optional

That sounds like it might be the version of Springfox (and it's an old one), which is not one of the projects we maintain. Without knowing the version of Swagger UI that you use, it'll be challenging for us to provide further assistance.

You can refer to https://github.com/swagger-api/swagger-ui/blob/master/docs/usage/version-detection.md for more details on how to find the version that you use.