Wrong parameter and method names generated for single quoted properties containing @ sign

Description

Codegen on swaggerhub generates Jersey and Resteasy code that doesn't compile when properties contain '@' sign.
Codegen generates improper Java fields. Eg. for '@baseType' swagger property definition there is @BaseType field name generated, and also getter/setter names are broken.

Swagger-codegen version

Not sure. The one from swagger.io.

Swagger declaration file content or url

I came across this issue while trying to implement TMF 655 Swagger API: https://raw.githubusercontent.com/tmforum-apis/TMF655_ChangeManagement/master/Change_Management.admin.swagger.json.

properties:
   '@baseType':
          type: string
          default: 'Attachment'
          description: The base type for use in polymorphic collections

Command line used for generation

Not applicable. I was using online codegen from swagger.io. I'll make tests on "standalone" version soon.

Steps to reproduce

Export -> Server stub -> jaxrs-jersey or jaxrs-resteasy

Related issues/PRs

Suggest a fix/enhancement

Codegen should "sanitize" such property names and exclude not allowed chars from field and getter/setter names. @JsonProperty annotation should be sufficient to reflect swagger contract for such properties.
I'll try to make a fix in codegen and post my solution soon.

Start by reproducing the issue with the linked TMF 655 Swagger declaration and the jaxrs-jersey or jaxrs-resteasy server-stub entry points. Trace how the '@baseType' property becomes a Java field and getter/setter names. Done means the generated Java compiles while @JsonProperty preserves the original property name.